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Review

Allelopathy of Lantana camara as an Invasive Plant

by
Hisashi Kato-Noguchi
1,* and
Denny Kurniadie
2
1
Department of Applied Biological Science, Faculty of Agriculture, Kagawa University, Miki 761-0795, Kagawa, Japan
2
Department of Agronomy, Faculty of Agriculture, Universitas Padjadjaran Jl. Raya, Bandung Sumedang KM 21 Sumedang, Jawa Barat 45363, Indonesia
*
Author to whom correspondence should be addressed.
Plants 2021, 10(5), 1028; https://doi.org/10.3390/plants10051028
Submission received: 27 April 2021 / Revised: 17 May 2021 / Accepted: 17 May 2021 / Published: 20 May 2021
(This article belongs to the Special Issue Plant–Plant Allelopathic Interactions)

Abstract

:
Lantana camara L. (Verbenaceae) is native to tropical America and has been introduced into many other countries as an ornamental and hedge plant. The species has been spreading quickly and has naturalized in more than 60 countries as an invasive noxious weed. It is considered to be one of the world’s 100 worst alien species. L. camara often forms dense monospecies stands through the interruption of the regeneration process of indigenous plant species. Allelopathy of L. camara has been reported to play a crucial role in its invasiveness. The extracts, essential oil, leachates, residues, and rhizosphere soil of L. camara suppressed the germination and growth of other plant species. Several allelochemicals, such as phenolic compounds, sesquiterpenes, triterpenes, and a flavonoid, were identified in the extracts, essential oil, residues, and rhizosphere soil of L. camara. The evidence also suggests that some of those allelochemicals in L. camara are probably released into the rhizosphere soil under the canopy and neighboring environments during the decomposition process of the residues and as leachates and volatile compounds from living plant parts of L. camara. The released allelochemicals may suppress the regeneration process of indigenous plant species by decreasing their germination and seedling growth and increasing their mortality. Therefore, the allelopathic property of L. camara may support its invasive potential and formation of dense monospecies stands.

Graphical Abstract

1. Introduction

Lantana camara L., which belongs to the family of Verbenaceae, is known as wild sage and red sage (Figure 1). It is a perennial shrub 1–4 m tall and forms dense stands. The leaves are opposite with long petioles, oval blades, hairy, and serrate. The species flowers all year round if the condition is adequate. A pair of inflorescences occurs at leaf axils. The flowers are small, multi-colored, and dense in flat-topped clusters. Each inflorescence bears 10–30 fruits, which are small, round drupes containing 1–2 seeds [1,2,3,4].
The species is native to tropical America and has been introduced into other countries as an ornamental and hedge plant. It adapts to varied habitats ranging from open, unshaded areas, such as pastures and crop fields, to disturbed areas, such as roadsides, railway tracks, and fired forests [3,4,5]. The plant has naturalized more than 60 countries as an invasive noxious weed and is considered to be one of the world’s 100 worst invasive alien species [6]. For example, L. camara was introduced in India at the beginning of the 19th century and has been growing densely, occupying 13.2 million ha [7]. The plant was first reported in 1841 in Australia and has spread and formed a pure stand over 4 million ha across Australia [8]. The first introduction of the plant in South Africa was in 1858. The species occupied 2 million ha with condensed area of 70,000 ha in 1998 [9]. The species has globally invaded millions of hectares of pastureland and infested major crop plantations, such as tea, coffee, sugarcane, and cotton plantations [3,4]. The invasion of the species also causes the severe reduction of biodiversity in the invaded ecosystems. The species threatened the habitat of 83 indigenous plant species in New South Wales in Australia [10].
L. camara displays high morphological variation because of extensive breeding [11]. The genetic diversity of L. camara population is high [3,12]. The species has diploid (n = 22), triploid (n = 33), tetraploid (n = 44), and pentaploid (n = 55) varieties [13]. Different ploidy levels are of ecological significance in the invasive potential of the species. L. camara in the native range of tropical America generally grows as a small clump less than 1 m in diameter. However, it often forms dense monospecies stands in diameter of 1–4 m in the invaded range [2,14]. The requirement conditions for L. camara growth and survival are 4.5–8.5 soil pH, 1000–4000 mm annual rainfall, unshaded conditions (however, it is tolerant to shade), and tropical to temperate regions (it is intolerant to frequent freezing) [4]. Thus, the potential of ecological adaptation is very high. Morphological characteristics of the species may contribute to the invasion and naturalization into the nonnative range [15,16,17].
The plants usually flower at the first growing season after establishment in most places [3,18], and there is a range of pollinators, such as insects and birds [19]. It was recorded that one plant produced up to 12,000 fruits each year [20]. Frugivorous birds and other animals contribute to the distribution of the seeds with animal feces, which adds additional nutrients for seed development [19]. L. camara also reproduces asexually. Vegetative reproduction occurs by layering horizontal stems and generating root systems [2,21]. The characteristics of L. camara for high reproduction may also contribute to the success of its invasion.
The formation of dense monospecies stands of L. camara, as described above, indicates its highly competitive ability with other plant species. Perennial plants may be able to release allelochemicals into the soil over several years, and those allelochemicals may accumulate in the soil under the trees [22,23,24,25,26,27]. According to the accumulated literature, L. camara possibly releases allelochemicals into the soil under its canopy. Those allelochemicals cause a reduction in seedling recruitment of the native plant species. Subsequently, L. camara forms dense monospecies stands. Therefore, allelopathy may play a crucial role in the L. camara invasion and formation of monospecies stands. The objective of this review is to discuss the possible involvement of allelopathy in the invasion and establishment of L. camara. This review paper provides an overview of the allelopathic property and allelochemicals of L. camara and discusses the importance of allelopathy for the invasion and formation of dense monospecies stands of L. camara.

2. Allelopathy of L. camara

Allelopathy is the interaction of one plant with another plant in its vicinity through releasing certain secondary metabolites, which are defined as allelochemicals [28]. The allelochemicals are released into the neighboring environments and rhizosphere soil of the plants by rainfall leachates, decomposition of plant residues, root exudation, and volatilization from living plant parts [28,29,30,31]. Therefore, the allelopathic potential of the extracts, leachates, residues, and rhizosphere soil of L. camara was evaluated by many researchers. In this chapter, the allelopathic potential of the extracts, leachates, residues, and rhizosphere soil of L. camara is summarized (Table 1).

2.1. Extract

Aqueous leaf extracts of L. camara inhibited the germination of Lactuca sativa L. due to the suppression of cellular membrane developments and increase in the production of reactive oxygen forms [32]. Aqueous leaf extracts of L. camara suppressed the development of leaf buds of Eichhornia crassipes Mart., increased the decay, and caused necrosis of E. crassipes leaves. The extracts also increased SOD activity in the leaves of E. crassipes concomitant with H2O2 accumulation and increased the membrane peroxidation level. The activity of catalase was decreased by the extract treatments. These observations indicate that leaf necrosis of E. crassipes may occur due to the oxidative stress caused by leaf extracts of L. camara [33].
Aqueous leaf extracts of L. camara inhibited the germination and growth of Brassica juncea (L.) Czern, Cucumis sativus L., Phaseolus mungo L., Raphanus sativus L., Vigna unguiculata (L.) Walp, Cicer arietinum L. [34], Centroma pubescens Benth. [35], and Vigna radiata (L.) R. Wilczek [36]. Aqueous extracts of L. camara leaves, stems, and roots also suppressed the germination and growth of Cicer arietinum L. [37], Phaseolus mungo (L.) Hepper [38], and Lens esculenta Moench [39]. In addition, the aqueous leaf extracts suppressed the regeneration of the moss species Funaria hygrometrica Hedw. [40].
Aqueous extracts of L. camara flowers suppressed the germination and seedling growth of Eruca sativa (L.) Cav. [41]. Aqueous extracts of flowers, fruits, and leaves inhibited the germination and seedling growth of Raphanus sativus L. and Lactuca sativa L. The inhibitory effect was more significant with flower and fruit extracts than leaf extracts [42]. Methanol extracts of stem and leaves of L. camara also inhibited the germination and growth of Lolium multiflorum Lam. [43]. The observations described in this section indicate that the extracts of L. camara possess inhibitory activity on the germination and growth of several other plant species and probably contain some extractable allelochemicals.

2.2. Leachate

Shoots and flowers of L. camara were cut into small pieces and soaked in water for 48 h. Filtered water was used as the leachates of L. camara. The leachates inhibited the growth of Eichhornia crassipes Mart. and finally killed E. crassipes 21 days after the treatment due to its high toxicity [44,45]. Leachates from L. camara leaves suppressed the germination and seedling growth of Mimosa pudica L. The concentrations of insoluble carbohydrate, proteins, and nucleic acids and the activities of dehydrogenase, catalase, and peroxidase in the seedlings were reduced by the leachates. However, the concentrations of amino acids and soluble carbohydrates were increased by the treatment [46,47]. Root leachates of L. camara inhibited the radical growth of Cucurbita pepo Linnaeus, Phaseolus vulgaris L., and Lycopersicon esculentum Mill. and altered the cytoplasmic protein synthesis in those radicals [48]. Leachates from L. camara roots also suppressed the germination and seedling vigor of Triticum aestivum L. [49]. Leachates from fruits and leaves of L. camara significantly inhibited the growth of Pennisetum americanum (L.) Tzvelev, Setaria italica (L.) P. Beauvois, and Lactuca sativa L. [50]. These observations suggest that some allelochemicals may be released into the soil under the trees from the leaves, shoots, flowers, fruits, and roots of L. camara by rain and irrigation water as leachates.

2.3. Residue

L. camara shoots were cut into small pieces and mixed with sand, and the seeds of Triticum aestivum L., Zea mays L., Glycine max (L.) Merr., Lepidium virginicum L., and Abutilon theophrasti Medik. were sown into the mixture. The growth of those seedlings was significantly suppressed by the residues of L. camara [51]. Lantana root and shoot residues and those decomposed residues also suppressed the growth of Morrenia odorata (Hook. & Arm.) Lindi. [52]. Decomposed leaf litter of L. camara inhibited the seedling growth of Raphanus sativus L., Lactuca sativa, L. Bidens pilosa L., Bidens bipinnata L., and Urena lobata L. [53]. These findings indicate that some allelochemicals were released into the soil during the decomposition process of L. camara residues.

2.4. Rhizosphere Soil

Rhizosphere soil of L. camara suppressed the growth of Achyranthes aspera L. and Albizia lebbeck [54]. Rhizosphere soil of L. camara also reduced the germination and seedling growth of Avena sativa L., Cicer arietinum L., Hordeum vulgare L., and Triticum aestivum L. [55]. These observations suggest that the rhizosphere soil of L. camara may contain some allelochemicals. The allelochemicals may occur during the decomposition process of plant residues in the soil and/or as leachates from living plant parts and root exudation.
Table 1. Allelopathic activities of the extracts, leachates, residues, and rhizosphere soil of Lantana camara.
Table 1. Allelopathic activities of the extracts, leachates, residues, and rhizosphere soil of Lantana camara.
SourceTarget Plant Species InhibitionStimulationReference
Extract
 LeafLactuca sativaGermination, cellular membrane developmentReactive oxygen form[32]
Eichhornia crassipesDevelopment of leaf buds, catalase, leaf necrosisSOD activity, H2O2 accumulation, membrane peroxidation[33]
Brassica juncea, Cucumis sativus, Phaseolus mungo, Raphanus sativus, Vigna unguiculata, Cicer arietinumGermination and growth [34]
Centroma pubescensGermination and growth [35]
Vigna radiataGermination and growth [36]
Funaria hygrometricaRegeneration [40]
 Leaf, stemLolium multiflorumGermination and growth [43]
 Leaf, stem, root Cicer arietinum,Germination and growth [37]
Phaseolus mungoGermination and growth [38]
Lens esculentaGermination and growth [39]
 FlowerEruca sativaGermination and growth [41]
 Flower, fruit, leafRaphanus sativus, Lactuca sativaGermination and growth  [42]
Leachate
 Shoot, flowerEichhornia crassipesGrowth [44,45]
 LeafMimosa pudicaConcentrations of insoluble carbohydrate, protein and nucleic acid. Activities of dehydrogenase, catalase and peroxidaseConcentrations of amino acid and soluble carbohydrate [46,47]
 Root Growth, protein synthesis [48]
Triticum aestivum,Germination and growth [49]
 Fruit, leafPennisetum americanum, Setaria italica, Lactuca sativaGrowth [50]
Residue
 ShootTriticum aestivum, Zea mays, Glycine max, Lepidium virginicum, Abutilon theophrastiGrowth [51]
 Root, shoot, decomposedMorrenia odorataGrowth [52]
 Decomposed leaf litterRaphanus sativus, Lactuca sativa, Bidens pilosa, Bidens bipinnata, Urena lobataGrowth [53]
Rhizosphere soilAchyranthes aspera, Albizia lebbeckGrowth [54]
 Avena sativa, Cicer arietinum., Hordeum vulgare, Triticum aestivumGermination and growth  [55]

3. Allelochemicals

Aqueous extracts of L. camara leaves inhibited the germination and seedling growth of Lolium multiflorum Lam., and 13 phenolic compounds were identified in the extracts. Those compounds were caffeic acid, gentisic acid, p-hydroxybenzoic acid, vanillic acid, salicylic acid, ferulic acid, p-coumaric acid, methyl coumarin, α-resorcylic acid, β-resorcylic acid, vanillin, and quercetin. All compounds inhibited the growth of L. multiflorum. The inhibitory activity of salicylic acid and methyl coumarin was more significant than that of other compounds [56]. Aqueous extracts of L. camara leaves also inhibited the growth of Lemna minor L., and 14 phenolic compounds: caffeic acid, gentisic acid, p-hydroxybenzoic acid, vanillic acid, salicylic acid, ferulic acid, p-coumaric acid, m-coumaric acid, o-coumaric acid, methyl coumarin, syringic acid, protocatechuic acid, t-cinnamic acid, and vanillin were identified in the extracts. The main phenolic compound in the extracts was p-coumaric acid, and the most active compound in the extract was salicylic acid [57].
Lantadene A and lantadene B were isolated from aqueous methanol extracts of L. camara leaves as allelochemicals [58]. Both compounds were first isolated as toxic substances in L. camara [59]. Lantadene A and lantadene B inhibited Eichhornia a Mart. and Microcystis aeruginosa (Kützing) Kützing at concentrations greater than 13.7 mg L−1 and 10.8 mg L−1, respectively. Lantadene A and lantadene B were also found in rhizosphere soil of L. camara at phytotoxic active levels [58]. The concentrations of those compounds varied by the geographical origin of the plants between trace amounts to 2.2% of leaves’ dry weight [60,61]. Methanol extracts of L. camara leaves also inhibited the growth of Phalaris minor Retz, Avena fatua L., Chenopodium album L., and Rumex dentatus L., and the flavone glucoside vitexin was isolated from the extracts as an allelochemical of L. camara [62].
The essential oil obtained from L. camara leaves suppressed the growth of plant pathogenic fungi Corynespora cassiicola (Berk. & M.A.Curtis) C.T. Wei. The main volatile compounds in the essential oil were germacrene D (19.8% of total oil), E-caryophyllene (19.7%), bicyclogermacrene (11.7%), and α-humulene (9.3%) [63]. The essential oil obtained from L. camara leaves also suppressed the seedling growth of Portulaca oleracea L. The major volatile compounds of the oil were β-caryophyllene, α-humulene, γ-muurolene, α-curcumene, β-curcumene, and γ-curcumene [64]. Some of the volatile compounds, such as β-caryophyllene, α-humiulene, and E-caryophyllene, have growth inhibitory activity [63,64]. Allelochemicals found in L. camara are summarized in Table 2.
A number of secondary metabolites in many classes, such as monoterpenes, sesquiterpenes, diterpenes, triterpenes, iridoid glycosides, flavonoids, and phenylethanoid glycosides, have been isolated and identified in the fruits, flowers, leaves, stems and roots of L. camara [61,64,65,66]. The biological activity of some of those compounds has been associated with anti-microbial, anti-fungal, anti-herbivore, and pharmacological activities. The allelopathic activity of most of the identified compounds in L. camara has not yet been determined. However, some of those compounds may possess phytotoxic activity [61,64,65,66]. Phytotoxic substances in plants can be released into the rhizosphere soil under the plants and neighboring environments either by rainfall leachates and volatile compounds from living plant parts of L. camara or by decomposition of plant residues and act as allelochemicals [29,30,31]. As described the previous section, the leachates from the plant parts of L. camara, residues, and rhizosphere soil L. camara suppressed the germination and growth of several other plant species. Therefore, allelochemicals of L. camara are probably released into its rhizosphere soil under the canopy and neighboring environments.

4. Invasion and Allelopathy of L. camara

The invasion of L. camara significantly reduced the plant diversity in the invaded area. The biomass of the L. camara invaded area was about half of that of the uninvaded areas [54]. Albizia lebbeck (L.) Benth. Is an indigenous plant species in Siwalik Hills in northern India, but no seedling was observed in the L. camara invaded areas. L. camara suppressed the growth and seedling recruitment of almost all native plant species under its canopy [3,67]. Rhizosphere soil of L. camara also significantly suppressed the growth of native plant species Achyranthes aspera L. [54]. In addition, activated charcoal recovered the inhibitory effect of the rhizosphere soil of L. camara [3]. These observations suggest that the rhizosphere soil of L. camara may contain some allelochemicals that disturb the regeneration process of native plant species by decreasing their germination and seedling growth and increasing their mortality.
L. camara is a perennial shrub, but senescent leaves are replaced by new leaves [3,4]. Those dropped leaves accumulate on the soil under the canopy and form a litter layer. Some of the secondary metabolites in the leaves may be liberated into rhizosphere soil during the decomposition process of the litter and act as allelochemicals (Figure 2). Allelochemicals are able to inhibit germination, seedling establishment, and plant growth of other plant species [29,30,31]. A substantial number of allelochemicals were identified in the L. camara leaves (Table 2). In addition, the decomposition rate of L. camara litter was faster than that of the leaf litter of native plant species [68]. In fact, lantadene A and lantadene B, which were isolated from the leaves, were also found in the rhizosphere soil of L. camara over growth-inhibitory levels [58]. The concentration of total phenolic compounds in the rhizosphere soil of L. camara was 27.6% higher than that in the soil of the uninvaded area of L. camara [69]. Phenolic compounds are often mentioned as putative allelochemicals, as they have been found in a wide range of plants and soils [70,71]. The inhibitory activity of most phenolic compounds is concentration dependent. Phenolic compounds interfere with several enzyme activities and almost all of the major physiological processes, such as phytohormone functions, mineral uptake, water balance and stomatal functions, photosynthesis, respiration, and the metabolism of certain compounds and flow carbons [70,72]. Those observations indicate that allelochemicals in L. camara litter may be released into rhizosphere soil during the decomposition process.
Many of the phytotoxic substances from the invasive plants have been reported to have multiple functions, such as anti-pathogen, anti-herbivore, and allelopathic activity [17,73,74]. Those compounds probably provide the plants with the advantage of increasing their population in the new habitats. A large number of secondary metabolites have been isolated from the extracts of different parts of L. camara, including monoterpenes, sesquiterpenes, diterpenes, triterpenes, iridoid glycosides, flavonoids, and phenylethanoid glycosides, and some of them were reported to possess anti-microbial, anti-insect, and pharmacological activities. [61,64,65,66]. Therefore, some of these compounds probably enhance the competitive ability of L. camara and make the plant invasive.
The characteristics of life history, such as high reproduction and high growth rate of L. camara, are essential to the success of the invasion into nonnative ranges [15,16,17]. The genetic diversity of L. camara is crucial for phenotypic plasticity to adapt to different environmental conditions [3,12,13]. Competitive ability is also one of the essential factors for L. camara to naturalize and establish dense monospecies stands in nonnative ranges [1,2,3,4]. As described previously, L. camara interrupts the regeneration process of indigenous plant species by decreasing their germination, reducing their seedling growth, and increasing their mortality. L. camara is allelopathic, and its allelopathic property may help the invasion of this species into nonnative ranges. In addition, the elevated temperature increased the allelopathy of L. camara [75], which indicates that global warming may increase the threat of the invasion of the species into additional nonnative areas.

5. Conclusions

L. camara is very invasive and often forms dense monospecies stands through the interruption of the regeneration process of native plant species by decreasing their germination and seedling growth and increasing their mortality. The evidence summarized in this paper indicates that L. camara is allelopathic (Table 1) and contains several allelochemicals, such as phenolic compounds, sesquiterpenes, triterpenes, and a flavonoid (Table 2). The evidence also suggests that some of those allelochemicals in L. camara are probably released into the rhizosphere soil under its canopy and neighboring environments during the decomposition process of its residues and as leachates and volatile compounds from living plant parts of L. camara (Figure 2). Allelochemicals can inhibit the germination and growth of other plant species. Therefore, the allelochemicals released from L. camara may provide the species with a competitive advantage against the native plants and may also suppress the regeneration process of native plant species and contribute to establishing their habitats as invasive plant species. However, it is essential to specify the allelochemical and to clarify its release process and quantity into the neighboring environments to understand the invasion and formation of dense monospecies stands of L. camara.

Funding

This research received no external funding.

Acknowledgments

The authors acknowledge the review journal funding from the Universitas Padjadjaran, Bandung, Indonesia.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Lantana camara. Photos were taken by Kato-Noguchi.
Figure 1. Lantana camara. Photos were taken by Kato-Noguchi.
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Figure 2. Allelopathy of Lantana camara contributes to forming dense monospecies stands.
Figure 2. Allelopathy of Lantana camara contributes to forming dense monospecies stands.
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Table 2. Allelochemicals of Lantana camara and target plant species for their activity.
Table 2. Allelochemicals of Lantana camara and target plant species for their activity.
AllelochemicalChemical ClassSourceTarget Plant SpeciesInhibitionReference
Caffeic acid, gentisic acid, p-hydroxybenzolic acid, vanillic acid, salicylic acid, ferulic acid, p-coumaric acid, methyl coumarin, α-resorcylic acid, β-resorcylic acid, vanillin, quercetin.Phenolic LeafLolium multiflorumGrowth[56]
Caffeic acid, gentisic acid, p-hydoxybenzoic acid, vanilic acid, salicylic acid, ferulic acid, p-coumaric acid, m-coumaric acid, o-coumaric acid, methyl coumarin, syringic acid, protocatechuic acid, t-cinnamic acid and vanillinPhenolic LeafLemna minorGrowth [57]
Lantadene A, lantadene BTriterpeneLeaf, rhizosphere soilEichhornia crassipeas, Microcystis aeruginosaGrowth [58]
VitexinFlavonoideLeafPhalaris minor, Avena fatua, Chenopodium album, Rumex dentatusGrowth *[62]
E-caryophyllene, bicyclogermacrene, α-humulene SesquterpeneEssential oil from leafCorynespora cassiicolaGrowth **[63]
β-Caryophyllene, α-humulene, γ-muurolene, α-curcumene, β-curcumene, γ-curcumeneSesquterpeneEssential oil from leafPortulaca oleraceaGrowth **[64]
Inhibitory activity was determined with a crude extract * and with total essential oil **.
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Kato-Noguchi, H.; Kurniadie, D. Allelopathy of Lantana camara as an Invasive Plant. Plants 2021, 10, 1028. https://doi.org/10.3390/plants10051028

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Kato-Noguchi H, Kurniadie D. Allelopathy of Lantana camara as an Invasive Plant. Plants. 2021; 10(5):1028. https://doi.org/10.3390/plants10051028

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Kato-Noguchi, Hisashi, and Denny Kurniadie. 2021. "Allelopathy of Lantana camara as an Invasive Plant" Plants 10, no. 5: 1028. https://doi.org/10.3390/plants10051028

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