2023.08.02.7
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Antifungal activity of metabolites from Trichoderma spp. against Fusarium oxysporum
González M.F 1,2,3* Galarza L 1,2 Valdez L.L 3 Quizhpe G.M 3
1 Escuela Superior Politécnica del Litoral, ESPOL, Biotechnology Research Center (CIBE), Campus Gustavo Galindo, Km. 30.5 vía Perimetral, P.O. Box 09-01-5863, Guayaquil, Ecuador.; [email protected] .
2 Escuela Superior Politécnica del Litoral, ESPOL, Faculty of Life Sciences, Campus Gustavo Galindo, Km. 30.5 vía Perimetral, P.O. Box 09-01-5863, Guayaquil, Ecuador; [email protected].
3 Universidad de Guayaquil, Facultad de Ingeniería Química, Facultad de Ciencias Química Cdla. Salvador Allende, Av. Delta entre Av. Kennedy, P.O. Box 471, Guayaquil, Ecuador.
* Correspondence: [email protected]
Available from: http://dx.doi.org/10.21931/RB/2023.08.02.7
ABSTRACT
The Trichoderma genus is well known as one of the most valuable biological control agents against several phytopathogens used in different plant species. Managing phytopathogenic fungi using the Trichoderma genus through various associated antifungal mechanisms is a sustainable and eco-friendly strategy that reduces the harmful presence of pathogens in soil, roots and aerial parts of plants. However, using biocontrol agents combined with chemical pesticides has evidenced further potential to reduce pathogen growth and benefit plant development. A better characterization of active metabolites secreted by Trichoderma and their mechanisms of action is necessary to improve its use as a biocontrol agent. This review summarizes current evidence on Trichoderma spp., used as a biocontrol against Fusarium oxysporum, the active secondary metabolites secreted by the former fungi, and the effect of three widely used agrochemicals to control the latter, namely Mancozeb, Chlorothalonil, and Propiconazole. A total of 155 studies were selected and used to extract information that was analyzed, resulting in more than 590 identified secondary metabolites. Fifty-four percent of these have at least one biological function. Results highlight the potential of T. harzianum and T. reesei as biological control agents to control Fusarium oxysporum. The antifungal activity of T. Espirale is associated with enzymatic reactions. Additional findings show that management of diseases caused by F. oxysporum can be combined by using Trichoderma as biological control and agrochemicals to reach: (1) higher access to the different plant tissues; (2) higher degradation of the cell wall; and (3) and activation of oxidative metabolism of Trichoderma.
Keywords: Trichoderma, secondary metabolites, fungicide, mycoparasitism, biocontrol, Fusarium oxysporum
INTRODUCTION
Fusarium oxysporum is one the most economically important phytopathogens when referring to agriculturally important crops such as bananas and other crops 1. The fungus infects the host plant through the roots or stems, causing wilt, blight, rot, and cancer of many plant species leading to significant yield loss in economically important crops such as banana 2, onion 3, tomato 4, chili 5, watermelon 6, cabbage 7, ginger 8, chickpea 9, soybean 10,11, eggplant plants 12, as well as ornamental plants like Chrysanthemum spp., Dianthus spp., Gerbera spp., Gladiolus spp. and Lilium spp. 1. No curative control method is currently available against this pathogen 1. Current approaches to control F. oxysporum infestation are based on prophylactic measures and cultural practices 1 like keeping tools, soils and substrates in good sanitary conditions, planting resistant or tolerant genotypes, paying particular attention to crop monitoring, appropriate management of irrigation and crop rotation 1.
Chemical fungicides have also been essential in managing Fusarium oxysporum wilt for decades. However, these chemical control agents often become ineffective since pathogens may develop resistance, and the chemicals may adversely affect soil fertility and accumulate in the crop 13. Since chemical pesticides are not selective, they can influence many beneficial non-target biotas and potentially harm the farmer's health 14–16. Due to the harmful effects of these products, different policies that limit pesticide use have been implemented in several nations in the world 1,17.
Alternatively, biocontrol agents aim to regulate the growth of the pathogen with less harm to the plant and farmers. In this line, mycopesticides are exciting products because they use several mechanisms of action that reduce plant disease caused by phytopathogenic fungi 1,13,18. Biopesticides are often less toxic than chemical products and decompose quickly. This can avoid pollution problems, resistance and residue concerns. Biopesticides generally affect only the target pest and closely related organisms, thereby protecting other organisms living in the same environment. The commercial evolution of the biopesticide market is promising to be a potential tool for pathogen control with a current annual growth rate of 14.1% 13.
Trichoderma spp. comprises more than 200 validly described species distributed in soils worldwide and across various habitats and are considered a valuable resource for structurally novel natural products with diverse bioactivities, including biological control of phytopathogens 19. In the interest of obtaining more effective methods of pathogen control, plant growth-promoting rhizosphere microorganisms have been used as a consortium or in combination with chemical pesticides by our group and other authors 20–23. Bioassays have revealed great potential to improve current methods of managing antifungal treatments to plant cultivars. Yet, summarized evidence about active metabolites and the mechanism of actions of both biocontrol agents and chemical pesticides is needed to better use this possibility.
In this work, we reviewed the use of Trichoderma spp. as a biocontrol agent and the secondary metabolites and enzymes that have been characterized as active molecules. As additional findings, we also summarized the antifungal activity of commercial fungicides Mancozeb, Chlorothalonil, and Propiconazole, which are often used to control plant diseases caused by F. oxysporum.
Narrative Findings on Trichoderma spp
Trichoderma is a genus that belongs to the family Hypocreaceae and comprises many different fungi strains found in most diverse ecosystems 19. Trichoderma strains proliferate and have a characteristic morphology, white and cottons at the beginning, then developing into yellowish green to deep green compact tufts. Trichoderma strains are characteristically branched 24. The distinctive species categorized in the genus of Trichoderma are hard to differentiate morphologically. Based on morphology, Trichoderma strains have been classified into five sections: Saturnisporum, Pachybasium, Longibrahiatum, Trichoderma and Hypocreanum 25. New genetic tools and physiological activity are used to determine the different functional groups within Trichoderma spp. Thus, current identification methods of Trichoderma strains include morphological and molecular characterization.
Many Trichoderma fungi act as biocontrol agents of phytopathogens and plant growth promoters 26. They can also stimulate plant defense mechanisms against insect pests and be efficient soil bioremediation agents 27. Trichoderma spp. can also be used in waste/organic materials decomposition and polluted area detoxification 28. Some examples have emerged as human pathogens, for example T. longibrachiatum. Consequently, while the studies on effective biocontrol fungal are ongoing, further research to avoid the risk for humans, plants, and other organisms contributed by Trichoderma spp. also need to be accomplished.
The Mechanisms of biological control by Trichoderma spp
Biological control by Trichoderma spp. is based on the activation of indirect and direct mechanisms. Direct and indirect mechanisms can act synergistically and depending on species and strain 29. The indirect mechanisms are competition for space and nutrients, growth promotion, and systemic resistance induction. The mechanisms by which Trichoderma induces systemic resistance in plants vary depending on plant species, Trichoderma species, pathogen species, abiotic stress conditions, and culture methods. It has been shown that Trichoderma colonization of plant rhizosphere may simultaneously activate both systemic acquired resistance and induced systemic resistance mechanisms of the plant. Trichoderma is also known to induce the resistance of plants towards diseases by root architecture alteration during the interaction with pathogens 30.
Direct mechanisms are mycoparasitism and the production of active metabolites and lytic enzymes 3,31. Mycoparasitism, the ability to parasitize on fungi, is a unique characteristic of Trichoderma since they can parasitize even taxonomically close species 19. The antifungal activity of Trichoderma against phytopathogenic fungi is attributed to the combined action of secondary metabolites (SMs) and hydrolytic enzymes i.e., cellulases, proteases, chitinases, and xylanases 3,32,33. About 500,000 secondary metabolites have been described; of these, 15.600 (47 %) are of fungal origin.
Characterization of genes involved in fungal–fungal interactions has indicated that are mainly those involved in signal transduction, fungal cell wall degradation, and production of secondary antifungal metabolites (SMs) 19.
Secondary metabolites and enzimes produced by Trichoderma spp
SMs are not essential for normal growth but are synthetized for specific environmental conditions. SMs can be either volatile or non-volatile organic compounds. Volatile SMs diffuse over a distance through systems in the soil affecting the physiology of competitor organisms 34–36. Non-volatile SMs exert their activity through direct interactions between Trichoderma species and their antagonists 35.
Our search for current evidence on SMs secreted by Trichoderma spp. Or enzymes resulted in annotating 590 unique compounds listed in the sup[A5] plementary Table S1. It includes many structural classes like pyrones, butenolides, steroids, peptaibols and terpenoids 19. Fifty-four percent of all SMs or enzymes retrieved in our search have at least one biological effect associated, described in Table S1. Even though this list of biological activities should not be considered exhaustive, it allows appreciation of the incredibly broad range of biological activities of Trichoderma SMs i.e, antifungal, antibacterial, antitumor, DPPH-radical-scavenging, positive effect on plant growth and development, among others (Table S1). Further investigation is required using isolated compounds to obtain a comprehensive understanding of all effects at different for the different combinations.
The list of SMs shown in supplementary Table S1 is consistent with previous papers that emphasize that the quality and the number of volatile compounds produced are variable for each strain of Trichoderma. As example of the diversity in SMs produced by different Trichoderma species. A total of 115 SMs were reported for T. reesei, T. harzianum and T. spirale (Table S1). SM or enzymes identified for T. reesei, T. harzianum and T. spirale are indicated in Table 1, 2 and 3, respectively, which could be potentially used to control Fusarium oxysporum, due to their antifungal activity.
Table 1. SMs of Trichoderma harzianum with antigungal activity
This result should not be understood as only T. harzianum secretes all these compounds. Genes encoding for proteins responsible for synthesizing these SMs are usually not expressed constitutively but due to interactions with the pathogen in the plant rhizosphere 4,45. For example, the SM trichosetin, presumably secreted by T. harzianum, has only been identified in dual culture of T. harzianum and calli of Catharathus roseus but not in single cultures 31. However, the vast diversity of SMs isolated and characterized from T. harzianum indicates the great potential value of this fungus as a biocontrol agent against phytopathogenic fungi.
In vitro and in vivo assays have shown T. harzianum isolates with higher inhibitory activity against F. oxysporum (F3) than other Trichoderma species 46. Biocontrol potential of T. harzianum against Fusarium Oxysporum has been demonstrated in vitro e in vivo against F. oxysporum in Poplar 47, ginger 8, cucumber 29,48, lettuce 49, white yam 50, chili 51, tomato and cucumber 52. Nonetheless, T. reesei is one of the top fungal species used in industrial biotechnology and is used safely for decades in enzyme production. In contrast to T. harzianum, T. reesei is considered to have a limited production of mycotoxins 53. Table 2 lists all SMS associated with antifungal activity.
Table 2. SMs or enzymes of Trichoderma reesei with antifungal activity
Despite the literature did not specifically listed the SMs of T. spirale associated with the antifungal activity, it was worth to list the asociated enzimes Trichoderma spirale (Table 3). This list is short but shows the potential use of T. spirale [A9] in the control of pathogenic fungi.
Table 3. Enzymes associated with antifungal activity of Trichoderma spirale
In this work, we reviewed the use of Trichoderma spp. as biocontrol agents, the secondary metabolites characterized as active molecules and the enzymes found in this bibliographic review which present antifungal characteristics that act directly on the phytopathogenic fungi. The following graph highlights the following strains of Trichoderma spp., T. reesei, T. harzianum and T. spirale with the most critical metabolites and enzymes
Figure 1. Secondary metabolites and enzymes associated with antifungal activity that stand out in T. reesei, T. harzianum and T. spirale strains identified in the literature review on using Trichoderma spp. as biocontrol agents against Fusarium Oxysporum.
Additional findings on the use of Trichoderma spp. and 3 synthetic pesticides[A10]
The low input cost and higher crop productivity of applying biological control agents (or biopesticides) are the economic benefits observed when compared to synthetic pesticides 63. Thus, the use of Trichoderma is regarded as a sustainable approach not only ecologically but also from an economic perspective.
However, using microbial-based products as biocontrols or biostimulants has some disadvantages compared to their chemical counterparts. Microbial products have a limited shelf life and require special conditions for conservation to maintain viability and efficacy 44. Also, they have constraints due to dependency on the crop, geographical, and meteorological regimes and pathogens 3,63.
One interesting approach that has emerged to cope with the advantages and limitations of the different methods to control crop infestation with F. oxysporum is the simultaneous application of Trichoderma as biological control with chemical pesticides and other biological control agents. For example, a combined treatment with T. polysporum LCB50 and irrigation with liquid compost applied resulted in a strong synergistic effect in controlling melon wilt and a 100% increase in the productivity of commercial fruit 64.
Recent results from our group have shown a synergistic effect using T. reesei and Mancozeb, inhibiting the mycelial growth of F. oxysporum (F1)20. Also, a synergic activity was obtained in vitro assays using T. ressei combined with Chlorothalonil or Propiconazole (unpublished data). However, the molecular basis of these agents' biological activity that results in an increased capacity to inhibit F. oxysporum infection is unknown.
Chlorothalonil (tetrachloroisophthalonitrile) and Mancozeb (manganese ethylene bis (dithiocarbamate) (polymeric) complex with zinc salt) are multisite enzyme inhibitors that act as protective broad spectrum fungicides 65. Both are non-systemic, preventive fungicides that form a protectant barrier at the surface of the plant against the germination of spores and inhibit pathogen development 65,66. Propiconazole (((2RS 4RS;2RS,4SR)-1-[2-(2,4-dichlorophenyl)-4-propyl-1,3-dioxolan-2-ylmethyl]-1H-1,2,4-triazole)) belongs to a group of systemic fungicides that destabilize the cell membrane integrity and affects ergosterol biosynthesis through the inhibition of C14-demethylation 65. Systemic fungicides are adsorbed into the leafs and translocated via the xylem, thus protecting the plant and controlling the circulating pathogens 65.
The co-inoculation strategy is possible as long as the fungus used as biopesticide tolerates the minimum concentration of the chemical fungicide required. This latter does not interfere with its development but contributes to increased control over the phytopathogenic specie. In this scenario, as proposed by Pelàez-Alvarez et al. (2016) 23, the presence of the chemical pesticide retards the growth of the phytopathogen, providing an advantage in the competition for space and nutrients in favor of the biopesticide. Chemical sensing of the competing fungus would induce the secretion of an arsenal of SMs that may act in both senses, facilitating the activity of the chemical fungicide and stimulating the plant's defense system 29,67. Hence, the movement of chemical fungicides takes place from the upper parts of the plant and, in the case of those of systemic activity, disseminates to lower parts.
F. oxysporum fungus enters through the roots and disseminates throughout the plant using the vascular system. In contrast to chemical fungicides, Trichoderma fungi are part of the rhizosphere and generally grow on plant root surfaces and therefore control root diseases in particular 68. Consequently, using Trichoderma as a biological control agent will provide an effective first barrier at the site of infection that will be complemented by the activity from top to bottom of chemical pesticides.
Previous work on Trichoderma spp. used as biocontrol agents have shown that cell wall degrading enzyme secreted by fungi i.e chitinase, cellulase, protease, and β-(1-3) glucanase and peptaibols are produced concurrently during biocontrol and interact synergistically as antifungal agents 69. The proposed mechanism for such an effect is based on the fact that enzymes degrade the cell wall of host fungal pathogens. This activity directly inhibits the growth of the pathogen, at the same time, facilitates the access of peptaibols to the cellular membrane. Peptaibols. are small peptides of 15-20 residues characterized by non-standard amino acids in their sequences, with a special propensity for aminoisobutyric acid. The antimicrobial activity of peptaibols is related to their capacity to form pores in lipid membranes 70.
The same synergistic effect has been described for the activity of cell wall degrading enzymes and other SMs targeting specific target molecules in inhibiting F. oxysporum by T. asperellum 29. Table 4 summarizes SMs identified as present in extracts with potent antifungal activity against F. oxysporum; or assayed from purified preparations and with proven inhibitory activity against this phytopathogen. Yet, important differences have been reported in the activity of cell wall degrading enzymes for T. asperellum and T. harzianum 29. Thus, this mechanism could not be similarly effective for all Trichoderma species.
Table 4. Metabolites identified in extracts, or purified, with antifungal activity against Fusarium oxysporum.
A similar synergistic activity could explain the outcome observed by co-inoculating Trichoderma species with biocontrol capacity against F. oxysporum and Mancozeb, Chlorothalonil and Propiconazole 20.. It is reasonable to expect a similar effect on facilitating the penetration of these chemical fungicides.
Systemic effects resulting from Trichoderma interaction with the plant would also contribute to the observed synergistic effect when used with chemical pesticides. Reactive oxygen species scavenging enzymes have been found significantly increased in plants treated with Trichoderma T-soybean, T. longibrachiatum and T. harzianum, thus improving plant resistance to oxidative stress 3,11,72. Exposure of plants to pesticides has evidenced that most of these chemicals lead to the development of oxidative stress 17. Also, root colonization by Trichoderma has been found to result in intensified levels of defense-related, including β-peroxidases and hydroxide lyase of lipoxygenase-pathway of the plant 73. Moreover, it has been evidenced that T. harzianum alleviates oxidative stress by minimizing reactive oxygen species accumulation during F. oxysporum infection 52. Thus, the contribution to activating a systemic response to oxidative stress in plants could be another level of cooperative action between chemical and biological control agents to control the attack of this phytopathogenic fungus.
CONCLUSIONS
Deleterious effects caused by F. oxysporum on plant species cause significant economic losses in agriculture at domestic and industrial levels. This review presents an organized narrative of information starting with the antifungal mechanism of Trichoderma, listing the SMs and enzymes involved in these mechanisms and finally the potential synergy of 3 synthetic pesticides for a better control of F. oxysporum. Our findings suggest that there is a need to develop more effective and ecologically friendly methods of controlling F. oxysporum, compared to the current control methods. Both chemical and biological control agents have individually played important roles protecting crops for millenniums. Also, both have advantages and disadvantages in their use. Thus, recent approaches have proposed the simultaneous use of chemical and biological pesticides and obtained promising results evidencing a synergistic activity controlling F. oxysporum infestation at in vitro and in vivo experiments. A better understanding of modes of action and cooperative effects of these two types of fungicide agents should let make better use of them in co-inoculation programs. The review of current knowledge on modes of action of Trichoderma in the control of F. oxysporum infection as well as the chemical fungicides Mancozeb, Chlorothalonil and Propiconazole confirms that their inhibitory activities may be compensatory and may lead to synergistic effects.
Supplementary Materials: Supplementary Table 1 (S1) is available under request.
Author Contributions: GMF, GL, VL and QG made substantial contributions conception and design, or acquisition of data, or analysis and interpretation of data. GMF and GL contributed drafting the article or revising it critically for important intellectual content. GMF and GL revised the final version of the manuscript before publication. GMF and GL ensures that any part of the work was appropriately investigated and resolved.
Funding: This study did not receive any funding
Institutional Review Board Statement: Ethical review and approval were waived for this study because it does not involve humans or animals.
Data Availability Statement: Data is available fully in open access.
Acknowledgments: Thanks to the scientific advisors who guided the initial design of this review.
Conflicts of Interest “The authors declare no conflict of interest.”
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Received: 2 January 2023/ Accepted: 130 March 2023 / Published:15 June 2023
Citation: Gonzalez MF; Galarza L; Valdez L, Quizpe G . A systematic review of antifungal activity of metabolites from trichoderma spp., and fungicides against Fusarium oxysporum. Revis Bionatura 2023;8 (2) 7. http://dx.doi.org/10.21931/RB/2023.08.02.7