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Article

Characterization of Neopestalotiopsis Species Associated with Mango Grey Leaf Spot Disease in Sinaloa, Mexico

by
Saida S. Gerardo-Lugo
1,
Juan M. Tovar-Pedraza
2,
Sajeewa S. N. Maharachchikumbura
3,*,
Miguel A. Apodaca-Sánchez
4,
Kamila C. Correia
5,
Carlos P. Sauceda-Acosta
6,
Moisés Camacho-Tapia
7,
Kevin D. Hyde
8,
Najat Marraiki
9,
Abdallah M. Elgorban
9 and
Hugo Beltrán-Peña
4,6,*
1
Facultad de Agronomía, Universidad Autónoma de Sinaloa, Culiacán, Sinaloa 80090, Mexico
2
Laboratorio de Fitopatología, Coordinación Culiacán, Centro de Investigación en Alimentación y Desarrollo, Culiacán, Sinaloa 80110, Mexico
3
School of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu 611731, China
4
Departamento de Ciencias Naturales y Exactas, Unidad Regional Los Mochis, Universidad Autónoma de Occidente, Los Mochis, Sinaloa 81223, Mexico
5
Centro de Ciências Agrárias e da Biodiversidade, Universidade Federal do Cariri, Crato, Ceará 63.133-610, Brazil
6
Facultad de Agricultura del Valle del Fuerte, Universidad Autónoma de Sinaloa, Ahome, Sinaloa 81110, Mexico
7
Laboratorio Nacional de Investigación y Servicio Agroalimentario y Forestal, Universidad Autónoma Chapingo, Texcoco 56230, Estado de México, Mexico
8
Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand
9
Department of Botany and Microbiology, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
*
Authors to whom correspondence should be addressed.
Pathogens 2020, 9(10), 788; https://doi.org/10.3390/pathogens9100788
Submission received: 4 September 2020 / Revised: 21 September 2020 / Accepted: 23 September 2020 / Published: 25 September 2020
(This article belongs to the Section Plant Pathogens)
Browse Figures
Versions Notes

Abstract

:
Mango is one of the most popular and nutritious fruits in the world and Mexico is the world’s largest exporter. There are many diseases that directly affect fruit yield and quality. During the period 2016–2017, leaves with grey leaf spots were collected from 28 commercial mango orchards distributed in two main production areas in Sinaloa State of Mexico, and 50 Neopestalotiopsis isolates were obtained. Fungal identification of 20 representative isolates was performed using morphological characterization and phylogenetic analysis based on the internal transcribed spacer (ITS) region of ribosomal DNA, part of the translation elongation factor 1-alpha (TEF) and the β-tubulin (TUB) genes. Phylogenetic analysis indicated that the 20 isolates from this study formed four consistent groups, however, overall tree topologies do not consistently provide a stable and sufficient resolution. Therefore, even though morphological and phylogenetic separation is evident, these isolates were not assigned to any new taxa and were tentatively placed into four clades (clades A–D). Pathogenicity tests on detached mango leaves of cv. Kent showed that the 20 isolates that belong to the four Neopestalotiopsis clades from this study and induce lesions on mango leaves. This is the first report of species of Neopestalotiopsis causing mango grey leaf spot disease in Mexico.

1. Introduction

Mango (Mangifera indica L.; Anacardiaceae) is the fifth most economically important tropical fruit in the world [1,2]. The mango fruit is appreciated for its unique flavor and nutritional value and is consumed in juices, beverages, jams and as a fresh fruit [3]. Over 90 countries cultivate mango, [4] Asia is the leading producer with 75% of the world’s production [5], but Mexico is the world’s largest exporter [6]. In Mexico, mango is the second tropical fruit of economic importance and during 2019, the production volume was 2,087,359 t in 193,549 ha, cultivated in 23 states, with Sinaloa as the largest producing state. The main cultivars produced in Mexico are Ataulfo, Kent, Manila, Tommy Atkins, Keitt, and Haden [7].
Diseases caused by fungi are the main limiting factor for mango production worldwide [8]. In Mexico, powdery mildew (Pseudoidium anacardii), anthracnose (Colletotrichum spp.), mango malformation disease (Fusarium spp.), stem-end rot (Lasiodiplodia spp. and Neofusicoccum spp.) and grey leaf spot (Pestalotiopsis mangiferae) are the most important diseases [9,10,11,12,13]. The grey leaf spot of mango has been reported in Australasia, Europe, USA and is widespread in Africa and Asia [12,14,15,16]. Initially, irregular yellow-to-brown spots appear on leaves and then turn white to grey and coalesce to form patches with abundant black acervuli [15,16]. In Mexico, grey leaf spot disease was observed in 0.3 to 2.0% of fruit cv. Manila [12].
The genus Neopestalotiopsis was segregated from Pestalotiopsis based on the conidial morphology and the phylogenetic analysis of the nuclear ribosomal RNA gene [17]. Generally, the colour of the median conidial cells enables the differentiation of the three genera [17]. The conidia with versicolored median cells belong to the genus Neopestalotiopsis, which seems to have evolved from the lineage of Pseudopestalotiopsis whose members have dark concolorous conidial median cells, while Pestalotiopsis presents the three light concolorous conidial median cells [17]. The morphology of the pestalotiopsis-like taxa varies depending on the environment and the host in which they were isolated. Therefore, the separation of species through phenotypic characteristics is difficult [18].
Pestalotiopsis-like taxa are important plant pathogens in tropical and subtropical regions, infecting diverse crops and causing leaf spots, dry flowers, root rot, trunk diseases, fruit rot and fruit scab [18,19,20,21,22,23,24,25,26,27]. Several pestalotiopsis-like species are responsible for the grey leaf spot of mango, including Neopestalotiopsis clavispora, N. egyptiaca, Pestalotiopsis anacardiacearum, P. mangiferae and P. uvicola [15,16,28,29,30]. Previously, Noriega-Cantú et al. [12] reported P. mangiferae as the causal agent of grey leaf spot in mango in Mexico, and the three median cells of the conidia of this species were observed as dark brown, which was not comparable with the characteristics of the genus Pestalotiopsis. However, the multi-locus sequence data proposed by Maharachchikumbura et al. [31] were not applied in their work, and the species was not confirmed to belong to Neopestalotiopsis.
During the period 2016–2017, symptoms of grey leaf spots were observed in commercial mango orchards distributed in the Sinaloa state of Mexico with high incidence and disease intensity up 8%. Therefore, the aims of this study were to (1) identify fungal taxa associated with grey leaf spot of mango in Sinaloa by a combination of morphological characterization and phylogenetic analyses and (2) determine their pathogenicity and virulence on detached mango leaves.

2. Results

2.1. Fungal Isolates

Isolation from symptomatic mango leaves with grey blight resulted in numerous fungal pestalotiopsis-like isolates being the most common (Table 1). Other fungi isolated from symptomatic leaves were Alternaria spp. and Colletotrichum spp. Based on the initial phenotypic characterization following the morphological traits described by Maharachchikumbura et al. [17], these isolates were found to belong to the genus Neopestalotiopsis. Since our effort was on pestalotiopsis-like species, we excluded the remaining isolates from further analysis. A total of 50 Neopestalotiopsis isolates from symptomatic mango leaves were obtained. Initially observed symptoms were irregular brown lesions not delimited by the veins (Figure 1a). The spots enlarged rapidly and form grey lesions or patches in older lesions, in some cases, with dark acervuli (Figure 1b,c). No symptoms were observed on fruits.

2.2. Morphological and Cultural Characteristics

The cultural characteristics of colonies in medium potato dextrose agar (PDA) (Becton Dickinson, Mexico) showed variation between different clades and isolates of the same clade (Table 2, Figure 2). Colonies were classified into four morphotypes. The first morphotype was present in all four clades. The second morphotype was exhibited by the Clade A and Clade B. The third morphotype was only observed in Clade C. The fourth morphotype was identified in Clade B and Clade D. This last clade was the most variable concerning the type of colony. Acervuli were observed in Clade A, Clade C, and Clade D on the PDA medium (Figure 2). The mycelial growth rate presented significant differences (p ≤ 0.05) between clades, Clade A was different from Clade B, but similar to Clade C and Clade D (Table 2). Conidia of the four clades were fusoid, 4-septate, hyaline end cells, versicolour median cells (two upper medium cells fuliginous and lower median cell pale brown) (Figure 3). The conidia presented 2–4 tubular apical appendages, unbranched, attached at the top of the basal cell, and one cylindrical basal appendage (Figure 3). In the length of the conidium, Clade D was different (p ≤ 0.05) to the rest of the clade, showing the largest conidia. The widest conidia were formed in the Clade B and Clade C with significant differences (p ≤ 0.05) when compared with the Clade A and Clade D (Table 2). The length of apical appendages was statistically different (H = 37.24, p ≤ 0.05) between clades, the longest apical appendages were observed in the Clade C. The Clade B presented the longest basal appendages and was significantly different (H = 81.89, p ≤ 0.05) to the other clades. The most common number of apical appendages was three with no significant difference between clades (Table 2).

2.3. Phylogeny

Twenty isolates of Neopestalotiopsis were selected as representative for phylogenetic analysis (Table 1). The combined internal transcribed spacer (ITS) + the β-tubulin (TUB) + the translation elongation factor 1-alpha (TEF) alignment was used to resolve the species relationship in the genus Neopestalotiopsis (Figure 4). The combined datasets consisted of 91 taxa, including Pestalotiopsis humus (CBS 115450) as the outgroup taxon. The alignment contained 1500 characters (521 for ITS, 483 for TUB, and 496 for TEF) and the combined datasets resulted in a best scoring RAxML tree with a final maximum likelihood (ML) optimization value of likelihood of −6532.281881, shown in Figure 4. The overall topology of our tree is comparable to that of earlier studies [17,20,32]. However, the overall branch-length support values were lower in most clades and recent studies have shown that the use of combined ITS, TEF, and TUB sequences to resolve numbers of cryptic species in pestalotiopsis-like taxa have some shortcomings. Therefore, even though the isolates from this study formed several consistent clades in the ML analysis, they were organized into four tentative clades (Clades A–D) and were not assigned to any taxa because the sequence data were insufficient to determine species boundaries in these isolates. The Clade D was the most frequently recorded in this study with seven isolates, followed by Clade C, B, and A. However, isolates belonging to Clade A and B were present in both municipalities of Sinaloa (Mexico), while isolates from Clade C and D were only recorded in the municipality of Ahome (Figure 5).

2.4. Pathogenicity and Virulence on Mango Leaves

All 20 tested isolates of Neopestalotiopsis distributed in the four clades were pathogenic on detached mango leaves cv. Kent. Inoculated leaves developed irregular brown lesions (Figure 6) with abundant black acervuli, 10 days after inoculation (DAI), and the lesions turned greyish 17 DAI, similar symptoms to those observed in naturally infected mango leaves. On the other hand, control leaves remained symptomless. Fungal colonies were re-isolated from all symptomatic leaves and were found to be morphologically identical to the original isolates inoculated, thus fulfilling Koch’s postulates. These results confirmed that Neopestalotiopsis is the causal agent of grey leaf spot in the production areas from Sinaloa. The average severity on artificially inoculated mango leaves was 4.16, 3.01, 4.25 and 3.24% of the total leaf area for Neopestalotiopsis Clade A, Clade B, Clade C and Clade D, respectively, without difference between clades (p ≥ 0.05). Additionally, the virulence of the 20 Neopestalotiopsis isolates did not show significant differences (p ≥ 0.05) and the growth rate was not correlated with the lesion area (r = 0.13, p ≥ 0.05).

3. Discussion

Pestalotiopsis-like fungi are difficult to differentiate based on morphological characters, because they vary according to the nature of the isolation and environmental conditions [17]. Based on the conidial characteristics, such as 4-septate, fusiform conidia, and versicolored median cells, it was possible to distinguish the 20 isolates into the genus Neopestalotiopsis and separate them from other pestalotiopsis-like genera [17,18]. The combination of host, symptoms, morphological characters and multi-locus phylogeny provides the tools for the species-level recognition of Neopestalotiopsis; however, using analysis of the combined ITS, TUB and TEF sequence data did not allow differentiation at the species level. The overall topology of our phylogenetic tree was not sufficiently supported, similar to that published in previous studies that maintained the Neopestalotiopsis isolates as Neopestalotiopsis spp. [17,32,33,34,35]. Although multi-locus phylogeny is important in species differentiation, there is still a lack of species deposited in public culture collections and only a fraction of DNA has been sequenced [36].
The pathogenicity test confirmed that all inoculated isolates were pathogenic on mango leaves cv. Kent, inducing brown and grey lesions with conidia exuding a cirrus from black acervuli. The symptoms were similar to those reported on mango grey leaf spot disease caused by pestalotiopsis-like fungi in Italy and China [15,16,29,37]. No symptoms were observed on fruits in mango orchards from Sinaloa. Perhaps this is due to the application of fungicides such as carbendazim, mancozeb, and copper oxychloride for the control of anthracnose in the mango producing areas of Sinaloa, which begins in pre-flowering until a few days before it harvests. These fungicides have been effective in controlling foliar diseases caused by Pestalotiopsis mangiferae, and Pestalotia anacardii in mango and Neopestalotiopsis cubana in rubber tree (Hevea brasilensis) [12,38,39]. It is necessary to carry out further studies to determine the susceptibility of the mango cultivars as well as to evaluate fungicides for controlling grey leaf spot disease in Mexico.
In this study, the incidence (% orchards infected) of mango grey leaf spot disease was high, with 100% in both municipalities of Sinaloa. The incidence at the field level (% tree infected) was not evaluated, but 70% to 100% have been reported in Italy [16]. Similar results have been reported for grey leaf spot disease with premature defoliation by pestalotiopsis-like fungi in other hosts, like Jatropha curcas, Canthium dicoccum, Vigna unguiculata, Cocos nucifera and Vacciniea corymbosum [40,41,42,43,44]. However, premature defoliation associated with grey leaf spot disease was not observed in the present study. Although some mango diseases such as anthracnose, powdery mildew and mango malformation [10,12,13] may have a higher incidence and severity in the orchards of Sinaloa, attention should be paid to emerging diseases such as grey spot.
Neopestalotiopsis Clades A–D showed no significant differences in disease severity under controlled conditions (humidity and temperature), but this could be different under field conditions, as reported in mango orchards from Taiwan and mainland China infected with grey spot disease [15,16]. There were no significant differences in virulence between clades A–D, nor between virulence and geographic origin of the isolates as observed in China with mango affected by pestalotiopsis-like species [37]. The growth rates of the isolates in this study are similar to the grey leaf spot disease reported by pestalotiopsis-like species [15,37]. Although the growth rates were almost the same in all the clades, only a field study could describe the behavior, estimate the rate of disease and determine the disease progression as a percentage of damage [45]. The symptoms of fungal diseases developed in mango can vary greatly, according to various factors, such as cultivar and environmental conditions [46]. Therefore, further research is needed to determine the different environmental conditions that affect the development of symptoms. Knowledge about the variation of virulence, its spatial distribution, and the development of the disease will provide the tools to establish integrated disease management.
This study represents the first detailed investigation of morphology, phylogeny and pathogenicity of Neopestalotiopsis species causing mango leaf spot in Mexico. The variation of the specific isolates in each of the clades described in this work, provides information on a threat to the mango industry, either due to its development of resistance to fungicides, as well as possible variations in virulence that it could have in the different cultivars and climatic conditions. Therefore, it is crucial to continue studying these clades in order to have knowledge of their epidemiology and their impact on mango productivity. To our knowledge, this is the first report of genus Neopestalotiopsis causing grey leaf spot of mango in Mexico.

4. Materials and Methods

4.1. Sample Collection

During the surveys carried out in 2016 and 2017, mango leaves exhibiting typical symptoms of grey spots (Figure 1) were collected from different cultivars in 28 commercial mango orchards distributed in the municipalities of Ahome in the north and El Rosario in the south, the two main production areas in Sinaloa, Mexico. The GPS readings were taken, and the collections were brought to the laboratory in Ziplock plastic bags.

4.2. Isolation and Purification

Symptomatic leaves were washed with neutral soap and surface sterilized with 90% ethanol for 30 s. The pieces of leaves (4 mm2) from the margins between the necrotic and healthy tissues were surface sterilized with 1% sodium hypochlorite for 60 s. The leaf pieces were washed with sterile distilled water and excess liquid was removed by sterile filter paper. The leaf pieces were placed in PDA plates and incubated at 25 °C for 3 days in darkness. Mycelial plugs from the edge of fungal hyphae developing from the tissues were aseptically transferred to fresh PDA and were incubated at 25 °C for 7 days in darkness. Monoconidial cultures were obtained using the method described by Zhang et al. [47]. In briefly fruiting bodies were crushed to separate the spores and obtain a spore suspension. The suspension was inoculated on to fresh PDA plates and the germinating conidia were aseptically transferred to fresh PDA plates. The purified cultures were stored in tubes with PDA covered with sterile mineral oil at 20 °C.

4.3. Morphological Characterization and Growth Rate

Macroscopic and microscopic characteristics were examined for 20 representative isolates of Neopestalotiopsis from mango collection sites in Sinaloa. To determine the growth rate of each isolate, mycelial plugs (12 mm diam.) were taken from 3-days-old cultures and placed on PDA. The plates were incubated at 25 °C in darkness. Colony diameters of three biological replicates of each isolate were daily examined over 5 days. The growth rate (kr) was calculated with the linear growth function y = kr x + c (where y is the distance, x is the time and c is the constant factor) and was expressed in mm day−1 [48]. After 10 days, colony growth characteristics, including colour of the colony and conidial masses were recorded. The experiment was conducted twice. Macro-morphological characters of the conidiomata were photographed by a Carl Zeiss Stemi 508 stereo microscope and conidial characters (n = 50) were visualized with a Nikon Eclipse Ni-U, microscope. All images were prepared using Adobe Photoshop CC 2018 and all measurements were made with NIS-element D software. Cultures of each isolate were deposited in the Culture Collection of Phytopathogenic Fungi of the Faculty of Agriculture from El Fuerte Valley (FAVF) at the Autonomous University of Sinaloa (Juan Jose Rios, Sinaloa, Mexico). Statistical analysis was performed with InfoStat® 2017 [49] by ANOVA and the mean values for length and width of conidia were compared using Tukey’s test, while the length of basal and apical appendages was compared using nonparametric Kruskal–Wallis test, in both cases with at a significance level of p ≤ 0.05. The correlation between growth rate and lesion area was analyzed by Pearson correlation.

4.4. DNA Extraction, PCR Amplification and Sequencing

Total genomic DNA was extracted from fresh fungal mycelia, scraped from the margin of a colony grown on a PDA plate, incubated at 25 °C with a DNeasy Plant Mini Kit (Qiagen, Valencia, CA, USA) following the manufacturer’s protocols. DNA concentrations were quantified using a Nano Drop One (Thermo Fisher Scientific, Madison, WI, USA) and the samples were diluted in sterile water to 100 ng μL−1 and stored at −20 °C. The ITS region of ribosomal DNA, part of TEF and TUB genes were amplified using the following pairs of primers: ITS4/ITS5 [50], EF728F/EF1-1567R [51] and BT2A/BT2B [52,53]. PCR reactions for three replicates of each sample were performed with the 25 μL reaction system consisting of 0.4 ng of genomic DNA, 0.04 U of Taq polymerase, 1× buffer, 0.8 μM of each primer, 0.2 mM of dNTPs, and 2.5 mM MgCl2. Amplifications were carried out in a Bio-Rad CFX96 thermocycler (Bio-Rad Laboratories, Hercules, CA, USA) with the following profile: an initial denaturation step at 95 °C for 3 min, followed by 35 cycles of denaturation at 95 °C for 30 s, annealing at 55 °C for ITS, 54 °C for the TEF, and 58 °C for TUB for 30 s, extension at 72 °C for 60 s and a final extension at 72 °C for 10 min. The PCR products were visualized on 1% agarose gel electrophoresis stained with ethidium bromide. The amplified PCR products were purified using QIAquick PCR Purification Kit (Qiagen, Valencia, CA, USA) and sequencing was carried out by the Macrogen (Macrogen Inc., Seoul, Korea).

4.5. Phylogenetic Analyses

DNASTAR Lasergene SeqMan Pro v.8.1.3 was used to obtain consensus sequences from sequences generated from forward and reverse primers and these were subsequently deposited in the GenBank database (Table 1). Multiple sequence alignments were generated with MEGA v.7.0.26 [54]. An ML analysis was performed using RAxML GUI v. 1.3 [55]. The optimal ML tree search was conducted with 1000 separate runs, using the default algorithm of the program from a random starting tree for each run. The final tree was selected among suboptimal trees from each run by paralleling likelihood scores under the GTR+GAMMA substitution model. The resulting phylograms were illustrated using FigTree v. 1.4.0 (http://tree.bio.ed.ac.uk/software/figtree/).

4.6. Pathogenicity and Virulence

Pathogenicity test was carried out on 20 isolates selected based on an initial phylogenetic analysis which resulted in four clades. The pathogenicity of all isolates was tested on mango (cv. Kent) leaves collected from commercial fields at Ahome, Sinaloa. Detached healthy leaves were washed with neutral soap and rinsed with running tap water to remove dirt and were superficially disinfected with 70% ethanol on both sides [27]. Disinfected leaves were wounded in a single site with a sterile toothpick. A mycelial plug (7 mm in diam.) was removed from the margin of 5-days-old growing colonies on PDA at 27 °C and was placed on the wounded site of each leaf. Each Neopestalotiopsis isolate was inoculated on three leaves (biological replicates) and the experiment was repeated twice. Mango leaves inoculated with PDA plug without fungal mycelium were used as the control. Inoculated leaves were incubated at 25 °C under a 12/12 h light/darkness on plastic trays lined with two layers of paper towel moistened with sterile distilled water and enclosed in a plastic bag to maintain moisture. Ten DAI, the presence or absence of symptoms on the inoculated leaves served to determine the pathogenicity of the isolates, and the virulence of each isolate was evaluated by determining disease severity. Inoculated leaves were pressed in a botanical press for 15 min and after, digitalized in a scanner (HP Officejet Pro 6830) at 300 dpi resolution. Disease severity was evaluated using digital images and the affected area was calculated by measuring the lesion area (mm2) concerning the size of the leaf by digital image analysis, with ImageJ Software (version 1.48r; NIH, Bethesda, MD, USA) [56]. The severity data were analyzed by nonparametric ANOVA with Kruskal–Wallis test using InfoStat® 2017 [49].

Author Contributions

Conceptualization, J.M.T.-P., M.A.A.-S. and H.B.-P.; methodology, S.S.G.-L. and M.A.A.-S.; formal analysis, S.S.G.-L., J.M.T.-P., S.S.N.M. and H.B.-P.; investigations, S.S.G.-L., S.S.N.M. and M.C.-T.; writing—original draft preparation, S.S.N.M., K.C.C., C.P.S.-A. and H.B.-P.; writing—review and editing, J.M.T.-P., S.S.N.M., H.B.-P., N.M., A.M.E. and K.D.H.; funding acquisition, J.M.T.-P. and H.B.-P. All authors have read and agreed to the published version of the manuscript.

Funding

This research was funded by CONACYT, grant number INFRA–2019–302117 and the Autonomous University of the West (UAdeO) grant number PIFIP–2019. The authors extend their appreciation to the researchers supporting project number (RSP-2020/201), King Saud University, Riyadh, Saudi Arabia.

Conflicts of Interest

The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.

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Figure 1. Symptoms of grey spot disease on naturally infected mango leaves. (a) Small lesion (early symptom) (b) Lesions coalescing. (c) Leaf blight (advanced symptom).
Figure 1. Symptoms of grey spot disease on naturally infected mango leaves. (a) Small lesion (early symptom) (b) Lesions coalescing. (c) Leaf blight (advanced symptom).
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Figure 2. Colonies on potato dextrose agar (PDA) (front) of selected isolates representative of Neopestalotiopsis clades at 10 days after incubation. (a) Clade A (isolate FAVF 160). (b) Clade B (isolate FAVF 157). (c) Clade C (isolate FAVF 162). (d) Clade D (isolate FAVF 169).
Figure 2. Colonies on potato dextrose agar (PDA) (front) of selected isolates representative of Neopestalotiopsis clades at 10 days after incubation. (a) Clade A (isolate FAVF 160). (b) Clade B (isolate FAVF 157). (c) Clade C (isolate FAVF 162). (d) Clade D (isolate FAVF 169).
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Figure 3. (a–t) Morphological features of selected isolates of Neopestalotiopsis Clades. (a–e) Clade A (isolate FAVF 198). (f–j) Clade B (isolate FAVF 204). (k–o) Clade C (isolate FAVF 162). (p–t) Clade D (isolate FAVF 167). (a,f,k,p) Conidiomata on PDA. (b,c,g,h,l,m,q) Conidiogenous cells. (d,e,i,j,n,o,r–t) Conidia. Scale bars (b) = 20 μm. Scale bar of (b) applies to (c–e,g–j,l–o,q–t).
Figure 3. (a–t) Morphological features of selected isolates of Neopestalotiopsis Clades. (a–e) Clade A (isolate FAVF 198). (f–j) Clade B (isolate FAVF 204). (k–o) Clade C (isolate FAVF 162). (p–t) Clade D (isolate FAVF 167). (a,f,k,p) Conidiomata on PDA. (b,c,g,h,l,m,q) Conidiogenous cells. (d,e,i,j,n,o,r–t) Conidia. Scale bars (b) = 20 μm. Scale bar of (b) applies to (c–e,g–j,l–o,q–t).
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Figure 4. Consensus phylogram tree resulting from a Maximum Likelihood (ML) analysis of the combined internal transcribed spacer (ITS), translation elongation factor 1-alpha (TEF) and β-tubulin (TUB) sequence alignments of Neopestalotiopsis isolates. Bootstrap support values above 50% are indicated at the nodes. The sequences derived from the present study are written in red. The scale bar represents the expected number of changes per site. The tree was rooted to Pestalotiopsis humus (CBS 115450).
Figure 4. Consensus phylogram tree resulting from a Maximum Likelihood (ML) analysis of the combined internal transcribed spacer (ITS), translation elongation factor 1-alpha (TEF) and β-tubulin (TUB) sequence alignments of Neopestalotiopsis isolates. Bootstrap support values above 50% are indicated at the nodes. The sequences derived from the present study are written in red. The scale bar represents the expected number of changes per site. The tree was rooted to Pestalotiopsis humus (CBS 115450).
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Figure 5. Distribution of four Neopestalotiopsis clades associated with mango grey leaf spot in 20 orchards distributed in the municipalities of Ahome and El Rosario, Sinaloa, Mexico. Circles represent association frequency of each clade with each population sampled, “v” is the number of commercial orchards sampled in each population and “n” is the number of isolates analyzed in each population.
Figure 5. Distribution of four Neopestalotiopsis clades associated with mango grey leaf spot in 20 orchards distributed in the municipalities of Ahome and El Rosario, Sinaloa, Mexico. Circles represent association frequency of each clade with each population sampled, “v” is the number of commercial orchards sampled in each population and “n” is the number of isolates analyzed in each population.
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Figure 6. Pathogenicity test of Neopestalotiopsis isolates on mango leaves after 10 days of inoculation. Leaves inoculated with: (a) Clade A (isolate FAVF 198). (b) Clade B (isolate FAVF 204). (c) Clade C (isolate FAVF 162). (d) Clade D (isolate FAVF 187).
Figure 6. Pathogenicity test of Neopestalotiopsis isolates on mango leaves after 10 days of inoculation. Leaves inoculated with: (a) Clade A (isolate FAVF 198). (b) Clade B (isolate FAVF 204). (c) Clade C (isolate FAVF 162). (d) Clade D (isolate FAVF 187).
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Table
Table 1. Sequences deposited at the NCBI database and their GenBank accession numbers, from the selected strains isolated in this study.
Table 1. Sequences deposited at the NCBI database and their GenBank accession numbers, from the selected strains isolated in this study.
TaxonCulture CodeCultivarLocationGeneBank Accession Number
ITSTUBTEF
Neopestalotiopsis sp. Clade AFAVF 198Tommy AtkinsEl RosarioMT774584MT782088MT782108
Neopestalotiopsis sp. Clade AFAVF 160KentAhomeMT774581MT782085MT782105
Neopestalotiopsis sp. Clade BFAVF 204KentEl RosarioMT774583MT782087MT782107
Neopestalotiopsis sp. Clade BFAVF 155KentAhomeMT774586MT782090MT782110
Neopestalotiopsis sp. Clade BFAVF 194AtaulfoAhomeMT774585MT782089MT782109
Neopestalotiopsis sp. Clade BFAVF 157KentAhomeMT774587MT782091MT782111
Neopestalotiopsis sp. Clade BFAVF 165AtaulfoAhomeMT774582MT782086MT782106
Neopestalotiopsis sp. Clade CFAVF 163KentAhomeMT774577MT782081MT782101
Neopestalotiopsis sp. Clade CFAVF 190KentAhomeMT774579MT782083MT782103
Neopestalotiopsis sp. Clade CFAVF 164KentAhomeMT774576MT782080MT782100
Neopestalotiopsis sp. Clade CFAVF 172AtaulfoAhomeMT774580MT782084MT782104
Neopestalotiopsis sp. Clade CFAVF 162AtaulfoAhomeMT774574MT782078MT782098
Neopestalotiopsis sp. Clade CFAVF 158KentAhomeMT774575MT782079MT782099
Neopestalotiopsis sp. Clade CFAVF 159KentAhomeMT774578MT782082MT782102
Neopestalotiopsis sp. Clade DFAVF 173Tommy AtkinsAhomeMT774572MT782076MT782096
Neopestalotiopsis sp. Clade DFAVF 187KentAhomeMT774568MT782072MT782092
Neopestalotiopsis sp. Clade DFAVF 176KentAhomeMT774569MT782073MT782093
Neopestalotiopsis sp. Clade DFAVF 174KentAhomeMT774570MT782074MT782094
Neopestalotiopsis sp. Clade DFAVF 169KentAhomeMT774571MT782075MT782095
Neopestalotiopsis sp. Clade DFAVF 167KentAhomeMT774573MT782077MT782097
Table
Table 2. Morphological and cultural characteristics of 20 Neopestalotiopsis isolates obtained from mango leaves in this study.
Table 2. Morphological and cultural characteristics of 20 Neopestalotiopsis isolates obtained from mango leaves in this study.
Average Size (µm) of Conidia and Appendages
Species wOriginColony Type xLengthWidthLength of Apical AppendagesLength of Basal AppendageNumber of Apical AppendagesAverage Growth (mm day−1) y
Neopestalotiopsis sp. Clade A (FAVF 160 and FAVF 198)Ahome,
El Rosario		1, 221.78 ± 1.61 A7.23 ± 0.55 A17.81 ± 2.54 A5.81 ± 1.31 B2–32.77 ± 0.06 B
Neopestalotiopsis sp. Clade B (FAVF 155, FAVF 157, FAVF 165, FAVF 194, and FAVF 204)Ahome,
El Rosario		1, 420.93 ± 1.86 A7.71 ± 0.80 B18.95 ± 3.68 A6.89 ± 1.66 C2–32.12 ± 0.16 A
Neopestalotiopsis sp. Clade C (FAVF 158, FAVF 159, FAVF 162, FAVF 163, FAVF 164, FAVF 172 and FAVF 190)Ahome1, 321.20 ± 1.92 A7.81 ± 0.99 B21.21 ± 4.71 B4.77 ± 1.36 A2–42.40 ± 0.23 AB
Neopestalotiopsis sp. Clade D (FAVF 167, FAVF 169, FAVF 173, FAVF 174, FAVF 176 and FAVF 187)Ahome1, 2, 423.29 ± 2.09 B7.13 ± 0.61 A18.35 ± 3.35 A5.24 ± 1.06 B2–42.48 ± 0.19 AB
w Codes within parentheses list the strains isolated for each clade. x Four colony morphotypes, where colony; 1 = bright-white colony, cottony texture, intermediate mycelium density, acervuli in the middle, regular edges; 2 = bone-white colony, velvety texture, high mycelium density, no acervuli, regular edges; 3 = white colony, powdery spiky texture, intermediate mycelium density, acervuli in the middle, irregular edges; 4 = white colony, powdery texture, low mycelium density, scattered acervuli, regular edges. y Rate of growth on potato dextrose agar at 25 °C in darkness. Data of averages represent means ± SD. Same letters in the column mean that there are no significant differences between clades, according to LSD in the Tukey test at the p ≤ 0.05 level.

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MDPI and ACS Style

Gerardo-Lugo, S.S.; Tovar-Pedraza, J.M.; Maharachchikumbura, S.S.N.; Apodaca-Sánchez, M.A.; Correia, K.C.; Sauceda-Acosta, C.P.; Camacho-Tapia, M.; Hyde, K.D.; Marraiki, N.; Elgorban, A.M.; et al. Characterization of Neopestalotiopsis Species Associated with Mango Grey Leaf Spot Disease in Sinaloa, Mexico. Pathogens 2020, 9, 788. https://doi.org/10.3390/pathogens9100788

AMA Style

Gerardo-Lugo SS, Tovar-Pedraza JM, Maharachchikumbura SSN, Apodaca-Sánchez MA, Correia KC, Sauceda-Acosta CP, Camacho-Tapia M, Hyde KD, Marraiki N, Elgorban AM, et al. Characterization of Neopestalotiopsis Species Associated with Mango Grey Leaf Spot Disease in Sinaloa, Mexico. Pathogens. 2020; 9(10):788. https://doi.org/10.3390/pathogens9100788

Chicago/Turabian Style

Gerardo-Lugo, Saida S., Juan M. Tovar-Pedraza, Sajeewa S. N. Maharachchikumbura, Miguel A. Apodaca-Sánchez, Kamila C. Correia, Carlos P. Sauceda-Acosta, Moisés Camacho-Tapia, Kevin D. Hyde, Najat Marraiki, Abdallah M. Elgorban, and et al. 2020. "Characterization of Neopestalotiopsis Species Associated with Mango Grey Leaf Spot Disease in Sinaloa, Mexico" Pathogens 9, no. 10: 788. https://doi.org/10.3390/pathogens9100788

APA Style

Gerardo-Lugo, S. S., Tovar-Pedraza, J. M., Maharachchikumbura, S. S. N., Apodaca-Sánchez, M. A., Correia, K. C., Sauceda-Acosta, C. P., Camacho-Tapia, M., Hyde, K. D., Marraiki, N., Elgorban, A. M., & Beltrán-Peña, H. (2020). Characterization of Neopestalotiopsis Species Associated with Mango Grey Leaf Spot Disease in Sinaloa, Mexico. Pathogens, 9(10), 788. https://doi.org/10.3390/pathogens9100788

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