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Article

Assessment of Metal Elements and Biochemical Constituents of Wild Turkey Tail (Trametes versicolor) Mushrooms Collected from the Shivalik Foothills of the Himalayas, India

by
Yasser S. Mostafa
1,
Ivan Širić
2,
Saad A. M. Alamri
1,
Sulaiman A. Alrumman
1,
Pankaj Kumar
3,4,
Sami Abou Fayssal
5,6,
Slaven Zjalić
7,
Rattan Singh
8,* and
Ebrahem M. Eid
9,*
1
Biology Department, College of Science, King Khalid University, Abha 61321, Saudi Arabia
2
University of Zagreb, Faculty of Agriculture, Svetosimunska 25, 10000 Zagreb, Croatia
3
Agro-Ecology and Pollution Research Laboratory, Department of Zoology and Environmental Science, Gurukula Kangri (Deemed to Be University), Haridwar 249404, India
4
Research and Development Division, Society for AgroEnvironmental Sustainability, Dehradun 248007, India
5
Department of Agronomy, Faculty of Agronomy, University of Forestry, 10 Kliment Ohridski Blvd, 1797 Sofia, Bulgaria
6
Department of Plant Production, Faculty of Agriculture, Lebanese University, Beirut 1302, Lebanon
7
Department of Ecology, Agronomy and Aquaculture, University of Zadar, 23000 Zadar, Croatia
8
Department of Food Technology, Guru Jambeshwar University of Science & Technology, Hisar 125001, India
9
Botany Department, Faculty of Science, Kafrelsheikh University, Kafr El-Sheikh 33516, Egypt
*
Authors to whom correspondence should be addressed.
Forests 2023, 14(11), 2247; https://doi.org/10.3390/f14112247
Submission received: 21 July 2023 / Revised: 6 November 2023 / Accepted: 13 November 2023 / Published: 15 November 2023
(This article belongs to the Special Issue Truffle Hunting and Mushrooms Ecology in Forest Ecosystems)
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Versions Notes

Abstract

:
Wild medicinal mushrooms are known to contain significant amounts of essential biochemical compounds with potential health benefits. Therefore, this study aimed to investigate the metal elements and biochemical constituents of wild turkey tail (Trametes versicolor) mushrooms collected from the Shivalik foothills of the Himalayas, India. Mushroom samples were purposefully collected from eleven (11) sampling sites located in three (3) districts of North Indian states (Uttar Pradesh and Uttarakhand). The results of this study indicated that wild T. versicolor showed the presence of eight metal elements (Cd: 0.011–0.139, Cr: 0.225–0.680, Cu: 1.073–3.108, Fe: 4.273–8.467, Mn: 2.157–3.892, Zn: 3.069–4.478, Ni: 0.065–0.186, and Co: 0.035–0.120 mg/kg). The samples also showed a significant presence of total phenolics (51.81–70.13 mg GAE/g), flavonoids (9.02–14.01 mg QE/mg), lycopene (0.02–0.08 mg/g), and β-carotene (0.31–0.72 mg/g). The proximate analysis also showed that T. versicolor is a good source of carbohydrate (38.33%–41.94%), protein (8.12%–11.06%), fat (0.93%–1.26%), moisture (63.80%–70.64%), dietary fiber (9.59%–14.30%), and total ash (2.42%–3.48%). In addition, gas chromatography (GC-FID) analysis revealed the presence of the five most dominant fatty acids, including linoleic acid (18:2n6c), palmitic acid (C16:0), oleic acid (18:1n9c), linolenic acid (18:3n3), and stearic acid (C18:0). Principal component analysis (PCA) and hierarchical cluster analysis (HCA) were helpful in identifying variations and similarities among different constituents of T. versicolor at selected sampling sites. Due to its low metal element content and rich biochemical profile, T. versicolor was highlighted in this research for its significant potential as a functional food or nutraceutical ingredient. This work promotes its sustainable use in the healthcare and food industries and lays the groundwork for further research into its therapeutic applications.

1. Introduction

Wild mushrooms typically grow in shaded and edge-wooded areas. These mushrooms play a vital role in the sustainability of ecosystems by helping plants share and communicate life-sustaining nutrients through chemical signaling while recycling both organic and inorganic by-products [1]. Extreme weather fluctuations, i.e., severe droughts or unusually heavy rainfall, and the spread of pests are the main factors that inhibit/reduce the growth, proliferation, and mycelial activity of wild mushrooms [2,3]. The high availability of nutrients from the soil contributes to rapid mushroom growth [4]. However, the impact of climate change on the overall production and distribution of wild mushrooms is not uniform. Foraging for wild mushrooms (Agaricus spp., Lentinula spp., Pleurotus spp., Auriscalpium spp., Hericium spp., Hydnum spp., etc.) is a tradition in many communities, despite the expansion of indoor mushroom cultivation. Moreover, mushroom foraging is an important daily source of food in rural areas, filling the gap that the cultivation of numerous species of mushrooms is unable to fill [5].
Turkey tail (Trametes versicolor) is one of the most common mixed-wood forest fungi, growing abundantly in clusters on decaying trees and logs. It is a saprophytic white-rot fungus (Polyporaceae, Basidiomycota) that degrades wood lignin through its developed mycelium. Wild T. versicolor is native to European, Southeast Asian, and North American forests. It grows best at temperatures of 15–24 °C and 75%–90% humidity, and grows on over 70 different species of hardwoods and conifers [6]. This mushroom has tiny pores instead of gills. “Versicolor” refers to the multicolored feature of this mushroom, which is very attractive to look at. Its taste is considered slightly bitter, earthy, and rather mild compared to shiitake. Although its taste is not bad, most mushroom consumers find it somewhat woody (tough texture) with a chewy consistency. This makes it unpopular among edible mushrooms worldwide.
Wild T. versicolor is known as a medicinal mushroom with a good protein content (about 11.1 g/100 g dry weight). Mushroom protein can help alleviate malnutrition and could be a promising substitute for meat protein [7]. T. versicolor contains significant amounts of phenolic acids, i.e., homogentisic acid, p-hydroxybenzoic acid, protocatechuic acid, and vanillic acid (1.24–113.2 μg/g dry weight) [8]. Phenolic acids from medicinal mushrooms have several medicinal bioactivities, including anti-hyperglycemic, anti-inflammatory, antimicrobial, antioxidant, anti-osteoporotic, antitumor, and anti-tyrosinase actions [9]. In addition, this species has been reported to have anti-diabetic properties and to enhance immune and innate immune responses [10,11]. Essential and non-essential amino acids can be found in T. versicolor, including asparagine, glutamine, isoleucine, leucine, and tyrosine (15.5–72.4 mg/100 g dry weight) [8]. Non-essential amino acids have been shown to be important aspects of tumor metabolism, i.e., epigenetic regulatory mechanisms, maintenance of redox homeostasis, and biosynthesis of lipids and nucleotides [12], while essential amino acids are needed for protein synthesis. Nine such essential amino acids, which cannot be synthesized by the human body, are found in mushrooms. T. versicolor is also a good source of vitamins, mainly nicotinic acid (vitamin B3), nicotinamide (vitamin B3), and vitamin D (12.8–26.5 mg/100 g dry weight) [8]. Vitamins help the human body strengthen bones, regulate hormones, fight infections, and heal wounds [13]. The medical field has benefited from the high beta-glucans content of wild T. versicolor in clinical breast cancer trials, suggesting a further promising research area [14]. Several fatty acids have been found in T. versicolor, including oleic, linoleic, linolenic, palmitic, and stearic acids [8]. As a good source of unsaturated fatty acids, this species helps reduce blood cholesterol [15].
Wild mushroom species can bioaccumulate significant amounts of potentially toxic elements (metal elements) from the environment in which they grow [16]. Recent studies have shown that wild mushroom caps have a greater ability than stalks to bioaccumulate metal elements [17]. These elements, when exceeding the standard safe limits set by local and international standards, can pose serious health risks, such as kidney, liver, skeletal, and cardiovascular issues. Therefore, bioaccumulation capacities and health risk assessments should be evaluated for safe human consumption. Pacheco et al. [18] reported the capacities of T. versicolor in the biosorption and bioaccumulation of 0.25–2.0 mg/L of lead ion (Pb II). Additionally, this species was able to accumulate 62.8 mg/g, 5 mg/g, 40–80 mg/L, and 30–400 mg/L of copper (Cu II), cadmium (Cd II), arsenic (As III), and chromium (Cr VI) ions, respectively, from different sources of pollution [19,20,21]. These reports revealed that T. versicolor is a potential metal element bioaccumulator.
The Shivalik Hills are an outer Himalayan mountain range occupying a total area of 2400 km, which includes uncoordinated rivers originating from the main Himalayan mountains. The Shivalik range is considered the main source of sediments for the Terai Plain and is home to diverse flora and fauna species. This region is solely dependent on agriculture; however, with the increased use of chemical fertilizers and pesticides, these products are mixed with drained water, causing deterioration of soil quality [22]. While the state of cultivated crops in this area has been denoted, the state of the wild vegetation, which constitutes the majority of flora present, remains scantly investigated. More particularly, wild mushroom populations in Shivalik Hills have been poorly explored. Therefore, the current study aims to investigate the biochemical and metal element contents of wild T. versicolor.

2. Materials and Methods

2.1. Description of the Study Area and Sample Collection

The present study was conducted in a total of three districts, namely Haridwar (H), Dehradun (D), and Saharanpur (S), located in the Shivalik foothills of the Indian Himalayan region (IHR). Of these, the Haridwar and Dehradun districts are located in Uttarakhand, while Saharanpur is located in Uttar Pradesh in northern India (Figure 1). A total of 11 sampling sites were purposively selected based on mushroom availability and the accessibility of the area, as listed in Table 1. The selected region is a mixture of different types of ecological landscapes, including mountains, dense forests, and the Ganga–Yamuna plains. In particular, the Shivalik foothills in this region are home to diverse wildlife, including several endangered species. Playing a vital role in maintaining the ecological balance of the region, the Shivalik foothills serve as an important corridor for wildlife movement. The region is also home to several species of wild mushrooms due to its favorable environmental conditions, such as rainfall, humidity, and temperature, especially during the monsoon season. Out of these, T. versicolor is a saprophytic mushroom that grows abundantly on dead wood logs and tree stumps (mostly the stumps of Casearia graveolens, Terminalia arjuna, Dalbergia sissoo, Mallotus philippensis, etc.) in this area.
For this research, T. versicolor samples were collected during the post-monsoon season in the study region, i.e., September to October 2022. A total of three (n = 3) healthy and fresh fruiting body samples of T. versicolor were collected from each sampling site. Thus, a total of 33 mushroom samples were collected (3 from each site). Mushroom fruiting bodies were carefully cut from the substrate material using a sharp knife, packed in transparent polyethylene zipper bags (100 g capacity), and placed in a polyurethane foam insulated ice cooler box (11 L, PinnacleThermo, Ahmedabad, Gujrat, India) for immediate transportation to the laboratory for further analysis.

2.2. Metal Element Analysis Using ICP-OES

T. versicolor samples collected from the selected sites were analyzed for eight metal elements using inductively coupled plasma optical emission spectroscopy (ICP-OES, 7300 DV, Perkin Elmer, Boston, MA, USA). For this purpose, fungal fruiting bodies were oven-dried at 60 °C until constant biomass was reached and then ground to a fine powder using a mechanical grinder. A total of 2 g of dried and powdered sample was then mixed with 20 mL of a diacid mixture containing a 3:1 ratio of HNO3 and HClO4, respectively. The mixture was allowed to self-digest overnight (12 h) in a 250 mL conical flask. The contents were heat digested using a hot plate at 150 °C for 1 h until a clear solution was obtained. The contents were further cooled, and the final volume was adjusted to 50 mL by the addition of 3% HNO3 solution. This content was filtered through Whatman no. 41 filter paper and finally used for metal element analysis by ICP-OES, as previously described by Kumar et al. [23].

2.3. Methods for Biochemical Analyses

The T. versicolor samples collected in this study were analyzed for selected biochemical (total phenolics: mg GAE/g, flavonoids: mg QE/mg, lycopene: mg/g, and β-carotene: mg/g) and proximate (carbohydrates, proteins, fat, moisture content, fiber, and total ash: %) parameters. For biochemical determinations, a total of 5 g of sun-dried mushroom sample was used to prepare a methanolic extract by continuous extraction in a Soxhlet apparatus. Total phenolic compounds were determined from the methanolic extract using Folin and Ciocalteu’s phenol reagent, followed by spectrophotometric determination at 725 nm (Cary 60, UV-Vis, Agilent, Santa Clara, CA, USA). The flavonoid content in the mushroom samples was determined using the aluminum nitrate colorimetric method, as previously described by Pękal et al. [24]. Similarly, lycopene and β-carotene contents were determined using 100 mg of methanolic extract continuously mixed with 10 mL of acetone–hexane solution (4:6) followed by filtration through Whatman filter paper number 4. The filtrate was used for spectroscopic determination of lycopene and β-carotene at 453, 505, 645, and 663 nm, as previously outlined by Barros et al. [25]. The fatty acid profiles of the mushroom samples were determined by extraction of the lipids using an n-hexane-based Soxhlet apparatus, followed by characterization by gas chromatography (GC) equipped with a flame ionizing detector (FID), as previously adopted by Kumari et al. [26]. All instrument-based analytical measurements were validated using certified reagent materials (CRM; BCR679, Merck, Mumbai, India) and standard reference materials (SRM; 1000 mg/L stock, Merck, India), as per the manufacturer’s instruction.

2.4. Methods for Proximate Analyses

For proximate determination, total carbohydrate fat and fiber contents were determined by following the standard methods adopted by Uju and Obiakor [27]. Protein contents were estimated by following Kjeldahl’s digestion method, as outlined by James [28]. Finally, total ash was determined using a muffle furnace.

2.5. Data Analysis and Software

The data obtained in this study were analyzed using Microsoft Excel (Version 2019, Microsoft Corp., Redmond, WA, USA) and OriginPro (Version 2023, OriginLab, Northampton, MA, USA) software packages. The data was processed using Pearson correction, principal component analysis (PCA), and hierarchically clustered heatmap tools. The level of statistical significance was p < 0.05.

3. Results and Discussion

3.1. Results of Metal Element Content Analysis in Turkey Tail (T. versicolor)

The results of the metal element content analysis in T. versicolor collected from different sampling locations of the Shivalik foothills of the Himalayas are shown in Table 2. Very low coefficients of variance (CV) were observed (0.12%–1.04%) among different analyzed metal elements, enabling a precise estimate of the metal elements. Cadmium (Cd), chromium (Cr), copper (Cu), iron (Fe), manganese (Mn), zinc (Zn), nickel (Ni), and cobalt (Co) contents in mushrooms collected from different locations were in the ranges of 0.011–0.139, 0.225–0.680, 1.073–3.108, 4.273–8.467, 0.065–0.186, and 0.035–0.120 mg/kg, respectively. Therefore, the metal element bioaccumulation order in collected mushrooms was as follows: Fe > Zn > Mn > Cu > Cr > Ni > Co > Cd. By contrast, Bulam et al. [29] mentioned a metal element accumulation in wild T. versicolor in the following order: Ni > Cu > Cr > Cd > Co. This difference could be attributed to the difference in soil composition among the sampling sites. However, there is also the possibility of metal element incorporation into the soil through air pollution. Moreover, variations may be due to the fact that different tree species accumulate different levels of metal elements, ultimately affecting the bioavailable concentration of mushroom species growing on them. It was also observed that different sampling sites significantly (p < 0.05) influenced the content of metal elements in T. versicolor.
Most sampling sites showed Cd content (0.011–0.035 mg/kg) below the safe limit set by Indian standards (0.10 mg/kg) [30]. Only H2 (Ranipur Forest Range) and D3 (Chandravani Grant) mushrooms showed slightly higher Cd values (0.139 and 0.0114 mg/kg, respectively). H2 has faced large-scale human activities in the last few years, i.e., mining, unsustainable construction, and infrastructure development, which has naturally resulted in toxic element dispersal. By contrast, the sources of pollutants in a small village such as D3 are mainly related to agricultural activities (i.e., pesticides, fertilizers, waste burning). High Cd exposure can lead to cardiovascular diseases, chronic kidney disease, and diabetes [31]. Nevertheless, Cd content in all collected T. versicolor was in accordance with the value denoted by Bulam et al. [29] (0.00258 mg/kg), and lower than that reported by Keskin et al. [32] (0.19 mg/kg). T. versicolor was considered an effective bioaccumulator for Cd, as it succeeded in absorbing 100–350 mg/kg of Cd from polluted soils within 2–7 days [21]. The H2 site showed the highest bioaccumulation of metal elements (Cd, Cu, Fe, Mn, Zn, and Ni), whereas D3 mushrooms had the highest bioaccumulation of Cr and Co. Encouragingly, Cr, Cu, Fe, Mn, Zn, Ni, and Co contents in all collected mushrooms were well below the safe limits set by Indian standards [30], USEPA [33], and FAO/WHO [34,35]. All these elements, when found in certain concentrations, are essential for the human body’s growth and development except for Cd. Cd is considered a toxic metal and could have detrimental impacts on the consumer’s health, making its biomonitoring essential before the mushroom can be considered for edible purposes. Fe, Zn, and Cu contents in all collected mushrooms from the Shivalik foothills of Himalaya were lower than observed by Akgul et al. [36] and Keskin et al. [32] (73.9–154.34, 11.4–15.68, and 6.80–8.94 mg/kg, respectively) in T. versicolor collected from the Kastamonu and Muğla provinces, Turkey.
The analysis of the Kurtosis and Skewness test results revealed both positive and negative values (−1.46 to 2.29 and −0.41 to 1.88, respectively). The positive values had random symmetric distribution throughout the sampling locations, and the negative values were represented by a few outliers. The vector length of the PCA plot in Figure 2a is the relationship between metal elements and sampling locations. The vector length showed the highest Fe, Mn, Cu, Zn, and Cr contents in H2, D3, and S3, followed by H1 and S1. Figure 2b outlines the hierarchal cluster dendrogram with a heatmap for metal elements contents in T. versicolor collected from different sampling locations of the Shivalik foothills of Himalaya, India. Analysis of this dendrogram indicates that Cd–Cu and Ni–Co contents had the highest similarities within collected mushrooms. Moreover, similarities between sampling locations were identified, with D3 and H2 showing the highest similarity.
Recent studies have adopted multivariate statistical analyses to analyze the metal element profile of collected mushrooms in different world regions. For instance, PCA and HCA were effective in depicting the variability of metal element contents in Russula and parasol mushrooms collected from Turkey, Morocco, and Spain, respectively [37,38]. Moreover, PCA and HCA adequately identified the heavy metal contamination levels of Agaricus bisporus mushrooms collected from different sites in Uttarakhand state, India [39] and Pleurotus spp. collected from different sites in Rajaji National Park, Haridwar, India [16]. Corroborating the evidence of all these studies, PCA and HCA successfully achieved the localization of metal element contamination levels in the Shivalik foothills of the Himalayas, India.

3.2. Results of Analysis of Biochemical Constituents in Turkey Tail (T. versicolor)

The results of the biochemical analysis of T. versicolor fruiting bodies collected from different locations of the Shivalik foothills of Himalaya are reported in Table 3. CV values were all very low (0.11%–0.37%), enabling a precise estimate of the elemental contents. H2 mushrooms showed the highest total phenolic and β-carotene contents (70.13 ± 5.01 mg GAE/g and 0.72 ± 0.05 mg/g, respectively), whereas D3 mushrooms had the highest flavonoid and lycopene contents (14.01 ± 1.00 mg QE/mg and 0.08 ± 0.03 mg/g, respectively). It is worth noting that although H2 and D3 mushrooms showed the highest metal element bioaccumulation, they also had the best medicinal properties. T. versicolor collected in the present investigation had lower total phenolic content than those analyzed by Bulam et al. [29] in Turkey (51.81 ± 3.70–70.13 ± 5.01 and 77.41 ± 1.10 mg GAE/g, respectively), and higher than those reported by Pop et al. (2018) in Romania (8.18–46.22 mg GAE/g) and Bains and Chawla [40] in Himachal Pradesh, India (48.71 mg GAE/g).
Phenolic compounds are well known for their free radical inhibition, metal inactivation, prevention of negative reactivity of undesired reactive oxygen, peroxide decomposition, and oxidative disease burden [41,42]. The flavonoid content found in T. versicolor collected from Turkey (13.82 ± 0.2 mg QE/mg) [29] and Himachal Pradesh, India (13.13 mg QE/mg) [40] fell within the range observed in the current study (9.02 ± 0.64–14.01 ± 1.00 mg QE/mg), whereas Szwajkowska-Michałek et al. [43] found poor flavonoid content in T. versicolor collected from Poland, and Pop et al. [44] failed to identify any flavonoid content. Flavonoids can help reduce blood platelet aggregation, lipoprotein oxidation, and cardiovascular mortality, and can regulate vascular reactivity [45]. The lycopene contents found in the collected T. versicolor of the present study (0.02 ± 0.01–0.08 ± 0.03 mg/g) corroborate the finding of Bains and Chawla [40]. The inhibition of cancer cell growth, modulation of immune function, and prevention of DNA, lipid, and protein oxidative damage could all be achieved with lycopene-rich products [46,47,48]. The β-carotene content in T. versicolor collected from Poland in a previous study was reported to be 1.01 mg/g [43], which is higher than the range observed in the present study (0.31–0.72 mg/g). It has been reported that both lycopene and β-carotene can stabilize or inhibit oxidation reactions [49]. Moreover, Grune et al. [50] mentioned that β-carotene is a good source of vitamin A, which is needed for human body growth and development, reproduction, and immune-system boosting. The results of the Kurtosis test showed negative values (−1.62 to −0.15), which indicated low extreme outliers, whereas those of the Skewness test denoted both positive and negative values (−0.19 to 0.62), which indicated few outliers. Skewness values were all between −2 and +2, which, according to George [51], indicates normal univariate distribution and acceptable asymmetry.
The PCA plot in Figure 3a outlined a strong relation between total phenolics and flavonoids at the H1, H2, H4, D1, and D3 sampling locations. The variance of identified components was noted as PC1: 95.11% and PC2: 4.87%. The vector length showed the highest total phenolic and flavonoid contents in H2 and D3, which confirms the results in Table 3. Figure 3b depicts a hierarchal cluster dendrogram with a heatmap for biochemical elemental contents in T. versicolor collected from different sampling locations of the Shivalik foothills of Himalaya, India. Analysis of this dendrogram indicates that TP–F and BC–L contents had potential similarities among the collected mushrooms. Furthermore, D3 and H2 sampling locations showed very high similarities in terms of the biochemical contents of the collected mushrooms, which confirms the findings of Table 3 and Figure 3a. Tokul-Olmez et al. [52] successfully used both PCA and HCA for the classification of four Ganoderma spp. based on the analysis of fifteen fatty acids. Earlier, Heinke et al. [53] adopted the same methodology for the identification and classification of four Suillus spp. based on their metabolite profiles. They not only reported the suitability of the PCA–HCA combination for the aforementioned task, but also proved it as a powerful tool for the chemotaxonomy of fungi. However, this is the first study to successfully combine PCA and HCA tools for the identification and quantification of total phenolic, flavonoid, lycopene, and β-carotene contents in mushrooms.

3.3. Results of Analysis of Proximate Constituents in Turkey Tail (T. versicolor)

Table 4 shows the contents of proximate parameters of T. versicolor samples collected from 11 locations in the Shivalik foothills of the Himalayas, India. With these results, it was observed that the carbohydrate contents of T. versicolor ranged between 38.33 and 41.94%, with the maximum value observed at the D4 site. Carbohydrate acts as a major constituent of the mushroom body, serving functions such as the formation of cell wall structures and storage reserves, which are necessary for mushrooms to thrive in nature [54]. The protein contents of the samples ranged between 8.12 and 11.06%, with maximum levels recorded at the H4 site. The fat contents were maximal at the H2 site (1.26 ± 0.09%), with an overall range of 0.93%–1.26%, respectively. Although most wild edible mushrooms have a higher moisture content (>80%), the turkey tail showed lower contents ranging from 63.80 to 70.64%. This might be because turkey tails have adapted to fluctuating environmental conditions by minimizing moisture content, which allows better shelf-life and prevents excessive water loss during dry periods [55]. Due to this feature, turkey tail has been found to survive at greater rates both in domestic and wild habitats. The total ash contents of the T. versicolor were observed within a range of 2.42%–3.48%, indicating optimum levels of inorganic material. The variation in the ash content might have been affected by the availability of different metal elements present in the substrate (usually wood logs) which were absorbed by the fungal mycelia and then transported to the upper body parts of the T. versicolor. The results of the Kurtosis test showed negative values (−1.44 to −0.82) for most parameters, indicating low extreme outliers, except for protein (1.12). However, the Skewness test denoted negative values (−0.48 to −0.04) for most parameters except for total ash, which had a positive value (0.25).
Moreover, the results of the PCA in Figure 4a show the data on two axes, PC1 and PC2, having a variance of 57.67% and 30.10%, with eigenvalues of 6.10 and 3.18, respectively. The vector length shows that moisture content was maximally correlated with the H2 site, while fiber content was correlated with the H1 site. These results are in line with those reported in Table 4. Similarly, the clustered heatmap dendrogram shown in Figure 4b indicates that S2 and H3 sites showed the highest similarities in terms of proximate properties of T. versicolor. Likewise, S3 and H2 formed the second most similar pair. T. versicolor has been widely analyzed for proximate constituents by researchers around the world. However, its characterization in the wild, particularly in the Indian Himalayan region, has been limited. A previous report by Upadhyaya et al. [56] found that T. versicolor collected from Nepal had significant contents of carbohydrates (54%), moisture (12%), ash (18%), fiber (20%), fat (2%), and protein (11%) contents, in line with those reported in the current investigation. Similarly, Kıvrak et al. [8] also found that T. versicolor had significant contents of moisture (87.21 g/100 g fw), protein (11.07 g/100 g dw), and fat (1.35 g/100 g dw). It was likewise observed that wild T. versicolor had significant contents of selected proximate constituents in the studied region.

3.4. Fatty Acids in Turkey Tail (T. versicolor)

In the identification and qualification results using GC-FID, the T. versicolor extract showed the presence of various fatty acids, as listed in Table 5. The contents of five fatty acids (i.e., linoleic acid: 18:2n6c; palmitic acid: C16:0; oleic acid: 18:1n9c; linolenic acid: 18:3n3; and stearic acid: C18:0) were observed in varying ranges across the selected sampling locations. However, linoleic and palmitic acids were observed in the highest levels, at 13.94%–23.38% and 14.08%–18.29%, respectively. Linoleic acid is an omega-6 unsaturated fatty acid helpful in reducing cholesterol, while palmitic acid is a saturated fatty acid that is widely used as an emollient [57]. Oleic acid (4.92%–8.13%) and stearic acid (1.74%–2.72%) were found at moderate levels, while linolenic acid (0.90%–2.02%) was found at minimum levels. However, the fatty acid composition of turkey tail might be influenced by several internal and external factors, such as the type of substrate on which they are grown and the climatic conditions supporting the synthesis of several biochemical constituents. Diets with selected saturated and unsaturated fatty acids are known to improve health benefits [58].
The Kurtosis test showed mostly negative values (−1.50 to −0.31) for all fatty acids except for stearic acid (0.14), while the Skewness test showed mostly positive values (0.10 to 0.21) except for oleic and linolenic acids (−0.35 and −0.26). Moreover, the PCA results given in Figure 5a show that the vector lengths of linoleic acid were mostly correlated, with D2, H3, and S3 the highest concentrations. For HCA, the S3 and D4 sampling sites showed the highest similarity in the occurrence of fatty acids in T. versicolor, followed by S1-H4 and D1-H1, respectively. This indicates that most of the sites had similar agroclimatic conditions, resulting in high similarities for fatty acid contents in wild T. versicolor.
Previously, researchers have analyzed T. versicolor for the presence of saturated and unsaturated fatty acids. Among them, Kıvrak et al. [8] found that wild T. versicolor had significant contents of linoleic, oleic, palmitic, stearic, and linolenic acids. Similarly, Günç et al. [59] investigated the fatty acid profiles of six wild edible mushroom species, including Boletus reticulatus, Flammulina velutipes, Lactarius salmonicolor, Pleurotus ostreatus, Polyporus squamosus, and Russula anthracina. They found that the most dominating fatty acids were cis-linoleic acid, cis-oleic acid, palmitic acid, and stearic acid, in line with the findings of the current study. The presence of a diverse range of fatty acids in wild T. versicolor found in the Shivalik foothills signifies their nutritional importance and health benefits. Particularly promising is the presence of significant amounts of unsaturated fatty acids, among which the omega-3 and omega-6 fatty acids are well-known for their beneficial effects on cardiovascular health, immune function, and the regulation of inflammation [15].

4. Conclusions

The results of this study confirm that wild T. versicolor samples collected from the Shivalik foothills of the Himalayas, India, showed the occurrence of eight metal elements (Cd, Cr, Cu, Fe, Mn, Zn, Ni, and Co). However, the levels of metal elements were relatively low, providing valuable insights into the safety and potential health benefits of this unique fungal species. Furthermore, the investigation of the biochemical, proximate, and fatty acid constituents of T. versicolor indicated that it can be used as a potential functional food or nutraceutical. However, it is essential to monitor the levels of metal elements to ensure consumer safety. This study underscores the potential of wild T. versicolor for various applications, including in the healthcare and the food industries. However, it is essential to emphasize that further validation is required to establish the safety of this species for the food industry. Further studies on the identification and quantification of other biochemical constituents, as well as on the domestication and commercial exploitation of wild strains of T. versicolor, are highly recommended.

Author Contributions

Conceptualization, Y.S.M., P.K., S.A.F., R.S. and E.M.E.; data curation, I.Š., S.A.M.A., S.A.A., S.A.F. and S.Z.; formal analysis, P.K. and R.S.; funding acquisition, Y.S.M. and E.M.E.; investigation, P.K. and R.S.; methodology, Y.S.M., I.Š., P.K., R.S. and E.M.E.; project administration, Y.S.M. and E.M.E.; resources, P.K.; Software, S.A.M.A., S.A.A. and S.Z.; supervision, E.M.E.; validation, I.Š., S.A.M.A., S.A.A., S.A.F. and S.Z.; visualization, I.Š., S.A.M.A., S.A.A., S.A.F. and S.Z.; writing—original draft, P.K. and S.A.F.; writing—review and editing, Y.S.M., I.Š., S.A.M.A., S.A.A., S.Z., R.S. and E.M.E. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by the Deanship of Scientific Research at King Khalid University, Abha, Saudi Arabia (grant number RGP.2/223/44).

Data Availability Statement

All data generated in this study is already provided within the article.

Acknowledgments

The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University for funding this work through Large Group Research Project under grant number R.G.P. 2/223/44. All individuals included in this section have consented to the acknowledgement.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Map of the study area showing selected locations for sampling of turkey tail (T. versicolor) mushroom.
Figure 1. Map of the study area showing selected locations for sampling of turkey tail (T. versicolor) mushroom.
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Figure 2. (a) PCA and (b) HCA results of metal elements in turkey tail (T. versicolor) mushroom collected from selected sampling locations in the Shivalik foothills of Himalaya, India.
Figure 2. (a) PCA and (b) HCA results of metal elements in turkey tail (T. versicolor) mushroom collected from selected sampling locations in the Shivalik foothills of Himalaya, India.
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Figure 3. (a) PCA and (b) HCA results of biochemical constituents in turkey tail (T. versicolor) mushroom collected from selected sampling locations in the Shivalik foothills of Himalaya, India.
Figure 3. (a) PCA and (b) HCA results of biochemical constituents in turkey tail (T. versicolor) mushroom collected from selected sampling locations in the Shivalik foothills of Himalaya, India.
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Figure 4. (a) PCA and (b) HCA results of proximate constituents in turkey tail (T. versicolor) mushroom collected from selected sampling locations in the Shivalik foothills of Himalaya, India (CH: carbohydrate; P: protein; FAT: fat; M: moisture; FIB: fiber; TA: total ash).
Figure 4. (a) PCA and (b) HCA results of proximate constituents in turkey tail (T. versicolor) mushroom collected from selected sampling locations in the Shivalik foothills of Himalaya, India (CH: carbohydrate; P: protein; FAT: fat; M: moisture; FIB: fiber; TA: total ash).
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Figure 5. (a) PCA and (b) HCA results of fatty acids in turkey tail (T. versicolor) mushroom collected from selected sampling locations in the Shivalik foothills of Himalaya, India (LEA: linoleic acid; LNA: linolenic acid; SA: stearic acid; PA: palmitic acid; OA: oleic acid).
Figure 5. (a) PCA and (b) HCA results of fatty acids in turkey tail (T. versicolor) mushroom collected from selected sampling locations in the Shivalik foothills of Himalaya, India (LEA: linoleic acid; LNA: linolenic acid; SA: stearic acid; PA: palmitic acid; OA: oleic acid).
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Table 1. List of sampling locations in selected states and districts used for collection of turkey tail (T. versicolor) mushroom samples collection.
Table 1. List of sampling locations in selected states and districts used for collection of turkey tail (T. versicolor) mushroom samples collection.
StateDistrictSite NameLatitude (N)Longitude (E)Altitude (m)
UttarakhandHaridwarChilla Forest Range (H1)30.155753278.1325196481.69
Ranipur Forest Range (H2)29.982495578.1640361454.91
Dhaulkhand Range (H3)30.049166978.0439193637.78
Pathri Forest Range (H4)29.884535378.2714997365.83
DehradunRishikesh Forest Range (D1)30.124386678.2687036422.58
Jollygrant (D2)30.202773878.1780745582.36
Chandravani Grant (D3)30.265789177.9829248650.35
Singhniwala (D4)30.332769177.8489892554.37
Uttar PradeshSaharanpurMohand (S1)30.176656377.8992169493.52
Shakumbhari Devi (S2)30.252917677.7482701531.11
Rehna (S3)30.347344977.6218811602.17
Table 2. The concentration of metal elements (mg/kg dwt.) in turkey tail (T. versicolor) mushroom collected from selected sampling locations in the Shivalik foothills of Himalaya, India.
Table 2. The concentration of metal elements (mg/kg dwt.) in turkey tail (T. versicolor) mushroom collected from selected sampling locations in the Shivalik foothills of Himalaya, India.
Sampling
Site		CdCrCuFeMnZnNiCo
H10.023 ± 0.001 c0.340 ± 0.021 d1.690 ± 0.050 c7.100 ± 0.507 d2.190 ± 0.156 a3.140 ± 0.024 a0.088 ± 0.016 b0.100 ± 0.007 d
H20.139 ± 0.007 f0.521 ± 0.007 i3.108 ± 0.022 e8.467 ± 0.205 e3.892 ± 0.078 f4.478 ± 0.109 e0.186 ± 0.013 d0.114 ± 0.028 de
H30.011 ± 0.001 a0.283 ± 0.020 b1.073 ± 0.019 a5.074 ± 0.360 ab2.338 ± 0.260 ab4.135 ± 0.291 de0.103 ± 0.007 c0.081 ± 0.006 c
H40.025 ± 0.001 c0.391 ± 0.018 f1.224 ± 0.047 b6.259 ± 0.146 c2.464 ± 0.116 b3.743 ± 0.067 c0.118 ± 0.010 c0.035 ± 0.002 a
D10.031 ± 0.002 d0.225 ± 0.016 a2.083 ± 0.102 d5.868 ± 0.219 b2.157 ± 0.054 a3.552 ± 0.154 b0.065 ± 0.005 a0.058 ± 0.004 b
D20.017 ± 0.001 b0.472 ± 0.034 h1.091 ± 0.094 a4.273 ± 0.305 a3.608 ± 0.018 f3.410 ± 0.043 b0.109 ± 0.009 c0.073 ± 0.005 bc
D30.114 ± 0.006 e0.680 ± 0.049 k2.782 ± 0.120 e8.136 ± 1.581 d3.079 ± 0.420 c4.031 ± 0.188 d0.176 ± 0.013 d0.120 ± 0.020 de
D40.025 ± 0.001 c0.378 ± 0.027 e2.050 ± 0.240 d4.794 ± 0.642 a2.962 ± 0.061 c3.069 ± 0.070 a0.093 ± 0.007 b0.087 ± 0.006 c
S10.021 ± 0.001 c0.440 ± 0.035 g1.782 ± 0.097 c6.849 ± 0.089 c3.275 ± 0.134 d3.989 ± 0.125 d0.070 ± 0.005 a0.094 ± 0.017 cd
S20.013 ± 0.001 a0.618 ± 0.005 j1.590 ± 0.115 c5.343 ± 0.581 ab3.438 ± 0.045 e4.045 ± 0.280 d0.110 ± 0.018 c0.064 ± 0.005 b
S30.035 ± 0.002 d0.315 ± 0.020 c2.177 ± 0.253 d7.840 ± 0.260 d2.390 ± 0.171 ab3.772 ± 0.069 c0.089 ± 0.006 b0.090 ± 0.006 cd
Range0.011–0.1390.225–0.6801.073–3.1084.273–8.4672.157–3.8923.069–4.4780.065–0.1860.035–0.120
CV (%)1.040.330.350.220.210.120.350.30
Kurtosis2.29−0.39−0.26−1.34−1.46−0.610.690.03
Skewness1.880.550.570.100.26−0.211.17−0.41
Values are mean followed by the standard deviation of three replicates; CV: coefficient of variance; a–k: different letters indicate a significant difference (p < 0.05) in the concentration of metal elements among different sampling sites.
Table 3. Contents of selected biochemical constituents in turkey tail (T. versicolor) mushroom collected from selected sampling locations of Shivalik foothills of Himalaya, India.
Table 3. Contents of selected biochemical constituents in turkey tail (T. versicolor) mushroom collected from selected sampling locations of Shivalik foothills of Himalaya, India.
Sampling SiteTotal Phenolics (mg GAE/g)Flavonoids (mg QE/mg)Lycopene (mg/g)β-Carotene (mg/g)
H160.57 ± 4.3212.01 ± 0.860.03 ± 0.010.41 ± 0.03
H270.13 ± 5.0113.95 ± 1.000.04 ± 0.010.72 ± 0.05
H355.81 ± 3.989.02 ± 0.640.06 ± 0.020.49 ± 0.03
H464.80 ± 4.639.56 ± 0.680.02 ± 0.010.56 ± 0.04
D165.46 ± 4.6713.41 ± 0.960.06 ± 0.020.31 ± 0.02
D258.39 ± 4.1713.20 ± 0.940.05 ± 0.010.49 ± 0.03
D369.33 ± 4.9514.01 ± 1.000.08 ± 0.030.67 ± 0.05
D455.69 ± 3.989.67 ± 0.690.06 ± 0.010.50 ± 0.04
S154.29 ± 3.8812.40 ± 0.890.03 ± 0.010.38 ± 0.03
S251.81 ± 3.7010.29 ± 0.730.04 ± 0.010.46 ± 0.03
S355.54 ± 3.9711.38 ± 0.810.06 ± 0.020.36 ± 0.03
Range51.81–70.139.02–14.010.02–0.080.31–0.72
CV (%)0.110.160.370.26
Kurtosis−1.26−1.62−0.57−0.15
Skewness0.45–0.190.070.62
Values are mean followed by the standard deviation of three replicates; CV: coefficient of variance.
Table 4. Contents of selected proximate constituents in turkey tail (T. versicolor) mushroom collected from selected sampling locations in the Shivalik foothills of Himalaya, India.
Table 4. Contents of selected proximate constituents in turkey tail (T. versicolor) mushroom collected from selected sampling locations in the Shivalik foothills of Himalaya, India.
Site NameCarbohydrates (%)Proteins (%)Fat (%)Moisture (%)FiberTotal Ash (%)
H138.33 ± 0.748.12 ± 0.581.15 ± 0.0868.70 ± 4.9114.13 ± 1.013.37 ± 0.24
H240.66 ± 1.909.83 ± 0.701.24 ± 0.0970.62 ± 5.049.59 ± 0.682.65 ± 0.19
H341.33 ± 2.0510.09 ± 0.320.97 ± 0.0764.16 ± 4.5811.24 ± 0.803.06 ± 0.22
H439.40 ± 2.4111.06 ± 0.491.26 ± 0.0968.20 ± 4.8714.30 ± 1.022.92 ± 0.21
D140.24 ± 1.879.24 ± 0.661.10 ± 0.0865.54 ± 4.6813.09 ± 0.932.71 ± 0.19
D239.14 ± 2.7010.23 ± 0.731.08 ± 0.0869.97 ± 5.0012.05 ± 0.863.48 ± 0.25
D338.94 ± 2.388.92 ± 0.640.93 ± 0.0763.80 ± 4.5612.42 ± 0.893.32 ± 0.24
D441.94 ± 1.929.66 ± 0.600.94 ± 0.0766.61 ± 4.7610.29 ± 0.732.89 ± 0.21
S140.83 ± 1.429.65 ± 0.491.22 ± 0.0970.64 ± 5.0413.85 ± 0.992.42 ± 0.17
S241.14 ± 2.9410.33 ± 0.541.03 ± 0.0765.89 ± 4.7011.66 ± 0.832.91 ± 0.21
S340.41 ± 1.699.74 ± 0.701.17 ± 0.0868.15 ± 4.8710.63 ± 0.762.69 ± 0.19
Range38.33–41.948.12–11.060.93–1.2663.80–70.649.59–14.302.42–3.48
CV (%)0.030.080.110.040.130.11
Kurtosis−0.941.12−1.44−1.31−1.23−0.82
Skewness−0.25−0.48−0.15−0.15−0.040.25
Values are mean followed by the standard deviation of three replicates; CV: coefficient of variance.
Table 5. Contents of selected fatty acids (%) in turkey tail (T. versicolor) mushroom collected from selected sampling locations in the Shivalik foothills of Himalaya, India.
Table 5. Contents of selected fatty acids (%) in turkey tail (T. versicolor) mushroom collected from selected sampling locations in the Shivalik foothills of Himalaya, India.
Site NameLinoleic Acid (18:2n6c)Palmitic Acid (C16:0)Oleic Acid (18:1n9c)Linolenic Acid (18:3n3)Stearic Acid (C18:0)
H115.3216.286.901.062.12
H218.4017.147.740.902.54
H321.1615.205.082.022.72
H413.9416.987.121.842.09
D116.8515.126.431.222.25
D223.3814.455.891.411.97
D314.7418.294.921.182.40
D417.9914.526.641.652.16
S118.0216.277.082.012.35
S220.9817.618.131.701.74
S321.5714.086.491.932.06
Range13.94–23.3814.08–18.294.92–8.130.90–2.021.74–2.72
CV (%)0.170.090.150.260.12
Kurtosis−1.12−1.30−0.31−1.500.14
Skewness0.100.16−0.35−0.260.21
Retention Time6.1810.7613.7215.5015.75
Molecular Weight (g/mol)280.24256.42282.46278.40284.48
Molecular FormulaC18H32O2C16H32O2C18C34O2C18H30O2C18H36O2
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Mostafa, Y.S.; Širić, I.; Alamri, S.A.M.; Alrumman, S.A.; Kumar, P.; Abou Fayssal, S.; Zjalić, S.; Singh, R.; Eid, E.M. Assessment of Metal Elements and Biochemical Constituents of Wild Turkey Tail (Trametes versicolor) Mushrooms Collected from the Shivalik Foothills of the Himalayas, India. Forests 2023, 14, 2247. https://doi.org/10.3390/f14112247

AMA Style

Mostafa YS, Širić I, Alamri SAM, Alrumman SA, Kumar P, Abou Fayssal S, Zjalić S, Singh R, Eid EM. Assessment of Metal Elements and Biochemical Constituents of Wild Turkey Tail (Trametes versicolor) Mushrooms Collected from the Shivalik Foothills of the Himalayas, India. Forests. 2023; 14(11):2247. https://doi.org/10.3390/f14112247

Chicago/Turabian Style

Mostafa, Yasser S., Ivan Širić, Saad A. M. Alamri, Sulaiman A. Alrumman, Pankaj Kumar, Sami Abou Fayssal, Slaven Zjalić, Rattan Singh, and Ebrahem M. Eid. 2023. "Assessment of Metal Elements and Biochemical Constituents of Wild Turkey Tail (Trametes versicolor) Mushrooms Collected from the Shivalik Foothills of the Himalayas, India" Forests 14, no. 11: 2247. https://doi.org/10.3390/f14112247

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