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*Corresponding Author: Meshu Shewarega Foyate, College of Agriculture and Natural Resource, Department of Plant Science, Wolkite University.
Citation: Meshu S. Foyate (2024), Improvement in Biocontrol Ability of Trichoderma Through Chemical Mutation and Gamma Irradiation for The Control of Soil Borne Pathogens, J Clinical Research and Reports, 15(1); DOI:10.31579/2690-1919/347
Copyright: © 2024, Meshu Shewarega Foyate. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited
Received: 11 January 2024 | Accepted: 22 January 2024 | Published: 31 January 2024
Keywords: trichoderma viride; soil borne pathogens; mutation; ethyl methyl sulphonate
Biocontrol agent like Trichoderma viride was acclaimed as effective, eco-friendly and cheap, nullifying the ill effect of chemicals, These biocontrol agents are identified to act against on array of important soil borne plant pathogens viz.,Sclerotium rolfsii, Rhizoctonia bataticola and Fusarium oxysporum f. sp. ciceri etc.” Improvement in biocontrol ability of Trichoderma viride through mutation” was carried at Department of Plant Pathology, during 2019-2020.
The antagonistic ability of a biocontrol agent was determined by its physiological state so that change in physiological or genetically conditions could alter the antagonism. Hence the genetic modification using mutagenesis offers the potential for producing improved bio-protection is likely to enhance their biocontrol capabilities against soil borne pathogen. Mutagenesis by chemical i.e. Ethyl Methyl Sulphonate (EMS) @ 100, 150, 200 and 250 µl/ml and time interval at 30, 45 and 60 minutes. The influence of gamma irradiation on improving production of antifungal metabolites and biological proficiency of the biocontrol agent against soil borne pathogen. Trichoderma viride were irradiated in different dose of gamma radiation (cobalt-60) @ 0, 20, 30, 40 and 50 k-rad. for induced mutation.
Sixteen Trichoderma viride mutants were obtained after chemical mutagenesis and gamma irradiation and tested for their antagonistic activities in vitro.
Morphological character of efficient mutants was tested up to six generation to check their stability. Among these, four stable mutants viz., TVME 2b, TVME 2c, TVME 3c and TVGM1 were proved as effective antagonists against Sclerotium rolfsii, Rhizoctonia bataticola and Fusarium oxysporum f.sp. ciceri basis of their maximum bioefficiency.
Mutants TVME2b, TVME2c, TVME3c and TVGM1 exhibited the highest inhibition to mycelial growth of Sclerotium rolfsii with an inhibition percentage 64.76, 64.22, 63.08 and 62.93% respectively. Rhizoctonia bataticola was inhibited to the extent of 63.47, 60.87, 61.93 and 61.02% by relative mutants, while Fusarium oxysporum f. sp. ciceri was restricted and recorded 63.50, 62.88, 62.03 and 60.74% respectively. The highest chitinase enzyme units/mg of protein i.e. 0.64, 0.63, 0.63 and 0.62 was exerted in TVME2b, TVME2c, TVME3c and TVGM1 having respectively. However, TVME1c contains 0.37 enzyme units; it showed maximum ability against pathogens. hence present study proved that mutagenesis is the efficient tool for improving bioefficiency of Trichoderma viride, a biocontrol agent.
Background
Many fungal genera have been playing a major role in the root disease complex causing seed decay, damping off, root rot, seedling blight, collar rot, crown rot, foot rot and wilt. These are the problematic diseases throughout the world, each having wide host range covering all group of plants. Lewis and Papavizas (1991) recorded that about 90% of the 2000 major diseases of 31 principle crops in United State are caused by soil borne pathogens. In the exact estimation in India, it can be safely assumed that more the rapidly growing human population needs an increase in agricultural production. However, the emergence of plant diseases raised the difficulty of this challenge (Boyd et al., 2012). Plant diseases had greatly reduced the production of many major crops, including potato, rice, barley, wheat, and soybean (Chakraborty et al., 1999). Many fungal plant pathogens were reported to cause plant diseases, and greatly reduce the production of economically important crops. For instance, Fusarium oxysporum f. sp. cubense, a soilborne fungus, was shown to cause Panama disease in banana. On the other hand, the more than 50% crop losses are due to soil inhabiting microorganisms (Elad, 1982). In severe cases, the potato yield loss is due to Fusarium dry rot could be as high as 60% ((Al-Mughrabi 2010).Plant diseases affect plants in the field as well as post-harvested crops. Apart from reducing crop yields, some of the species like Fusarium.
Chemical control for these soil borne pathogens is arduous, uneconomical and not advisable owing to risk of ground water pollution, death of non-target beneficial flora and fauna and evolution of fungicide resistant pathogen variants Moreover, many components of pesticides are recalcitrant and tend to persist in the environment for long period of time (Hai et al., 2012). Besides that, it is not cost effective to use chemical pesticides in the long run. Biological control of these pathogens by microorganisms has been considered a more natural and environmentally acceptable alternative to the existing chemical treatment methods (Baker and Paulitz, 1996). Keeping these in view research on biological control of this group of pathogens is being carried out worldwide.
There are many biological control agents which have been reported as an efficient alternative to reduce the use of fungicides. However, in order to continue management of new strain /races of soil borne fungal pathogens being evolved in the nature, there is necessity to evolve new effective biocontrol agents. Amongst many effective bio control agents, Trichoderma is one of them whose species have been reported to be inhibitory to many soil borne pathogens (Harman et al., 2004). Bio control agent like Trichoderma spp. are acclaimed as effective, eco-friendly and cheap, nullifying the ill effect of chemicals. Therefore, of late, these biocontrol agents are identified to act against on array of important soil borne plant pathogens causing serious disease of crops. Therefore, considering the cost of chemical pesticides and hazardous involved, biological control of plant disease appears to be an effective and eco-friendly approach being practice world over (Dominguesa et al. 2000).
Trichoderma is a well-known biological control agent (BCA) because of its ability to reduce the population of soil borne pathogens. It is also a soil borne fungus and show significant activity against a wide range of plant pathogenic fungi (Elad et al., 1982 and Migheli et al., 1998). It has been used with success against a broad such as fungi and other organisms (including airborne and soil borne), bacteria, nematode, protozoa, and even viruses (Howell., 2009) Comparative efficacy of Trichoderma viride and Trichoderma harzianum against Fusarium oxysporum f.sp.ciceri is causing wilt of chickpea. Bioagents significantly reduced the wilt incidence, and increased seed germination and plant growth parameters as compared to chemical fungicides (Shabir-U-Rehman et al., 2014) They act against plant pathogens in several ways, either by mycoparasitism, antibiotic-mediated suppression, lytic enzymes and other by-products production, competition for nutrient, or induction of host resistance (Pal and Gardener 2011).
The mycoparasitism, antibiosis, competition for nutrients of space, tolerance to stress through enhanced root and plant development, induced resistance, solubilization and sequestration for inorganic nutrients and inactivation of the pathogen’s enzymes were important mechanisms of Trichoderma spp. against plant pathogens (Harman, 2000).
1.2 Importance of Study
Genetic modification using mutagenesis offers the potential for producing improved bio-protection is likely to enhance their biocontrol capabilities against different soil borne pathogen. One attractive approach would be to select the stable and safe transgenic fungi with different genes coding for cell wall degrading enzymes (chitinase and glucanase and protease) which express co-ordinately to combat the phytopathogen. Chitin, glucan and proteins are the main structural components of fungal cell wall. In plants, induction of chitinase, glucanase and other hydrolytic enzymes is one of the coordinated, often complex and multifaceted defense mechanisms triggered in response to phytopathogen attack.
Mutagenesis or protoplast fusion of biocontrol agents was applied to improve the antifungal production and antagonistic potential over a broad spectrum of phytopathogens, survival, longevity and activity. (Haggag et al., 2010). It is necessary to mutagenesis of the microorganisms including those used as bio control agents were applied to improve of the antifungal production and antagonistic potential over a broad spectrum of phytopathogens, survival, longevity and activity (Ximena et al., 2007
1.3 Objectives of the Study
1.4 Scope and Limitations
Trichoderma has been widely studied for their biocontrol ability, but Trichoderma have some limitations in their use as biocontrol agents in agriculture is due to the unpredictable efficiency which is affected by biotic and abiotic factors in soil. Hence it is essential to increase their bio control efficacy against targeted pathogen and to made it tolerant to environmental parameters, mutagenesis is the tool for improving genetic makeup of Bio agents.
The present investigation on “Improvement in bio control ability of Trichoderma viride through mutation” was carried out during 2019/2020 at Department of Plant Pathology, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola.
Ethyl methyl Sulphonate (EMS), Ethanol, Crab shell chitin, Sodium azide and others such as formaldehyde, Streptomycin Sulphate, mercuric chloride etc. Pure culture of Trichoderma viride culture was collected from the Department of Plant Pathology Dr. PDKV, Akola. Pure cultures of soil born pathogen viz., Rhizoctonia bataticola, Sclerotium rolfsii, and Fusarium oxysporum f. sp. ciceri were collected from Department of Plant Pathology, Dr. P.D.K.V, Akola.
Chemical Mutagenesis
Induction of Chemical mutagenesis was carried according to procedure of Chandra et al. (2009) and Durand et al. (1988): Conidiophores of 8 days old culture of T. viride were used for mutagenesis. Spore suspension of T. viride was treated with Ethyl Methyl Sulphonate (EMS) @ 100 μl/ml, 150 μl/ml, 200 μl/ml and 250µl/ml incubate at 280C in orbital shaker for 30 minutes. Then kept in centrifuge machine at 5000 rpm to remove the chemical traces, centrifuge it for three times and then washed with distilled water. Suspension was spread on to the surface PDA medium and incubated at 280C for 720 hour.
Same procedure was done for 45 minutes and 60 minutes. In each treatment maintained three replications. After incubation colonies were transferred on fresh PDA medium and grown up to six generations to check the stability of Trichoderma viride mutants.
Mutation induced by Gamma Radiation.
Induction of mutation by gamma radiation was carried according to the procedure of Gadgil et al. (1995), Migheli et al. (1998) and Rey et al. (2000) at Bhabha Atomic Research Centre, Mumbai. The 10 days sporulate culture of Trichoderma viride was irradiated with cobalt – 60 gamma radiation @ 41.6 gray/min. The applied doses level were 20 k-rad,30 k-rad,40 k-rad and 50 k-rad. After irradiation culture were transferred on fresh PDA medium and grown up to six generation to check the stability of Trichoderma viride mutants.
Dual culture Technique
Antagonistic activity of Trichoderma viride mother culture as well as mutants were assayed against Rhizoctonia bataticola, Sclerotium rolfsii, Fusarium oxysporum f.sp. udum and Fusarium oxysporum f. sp solani by using dual culture inoculation technique described by Vincent, (1927), Mandal et al., (1999) in Petri plates. Five mm disc from the periphery of actively growing pathogen on PDA was placed in centre of 90 mm diameter Petri plates containing PDA. Four discs of each actively growing mutants of Trichoderma viride were placed at equidistance on all four sides 30 mm apart from centre disc of pathogenic fungus. The plates were incubated at ambient condition under alternate dark and light cycle up to 7 days.
C – T
Per cent Growth inhibition = ––––––––– X 100
C
Where, C = Mycelial growth (mm) in control plate.
T = Mycelial growth (mm) in treatment plate.
This chapter deals with the results obtained on the basis of studies carried out and the fact along with the discussion hereunder.
Morphological characteristics of Trichoderma viride mutants at sixth generation
Efficacy of Trichoderma viride mother culture and mutants against Sclerotium rolfsii (per cent growth inhibition) at 7 DAI
Statistically significant differences were obtained among the T. viride mutants over control (mother culture). The superior treatment was T5 (TVME2b) mutant exhibited the highest inhibition to mycelial growth of Sclerotium rolfsii with an percentage 64.76%.which was at par with T6 (TVME2c),T9 (TVME3c) and T13 (TVGM1) i.e. 64.22, 63.08 and 62.93 % respectively. whereas T10 (TVME4a) showed lowest inhibition i.e. 52.56% against growth of Sclerotium rolfsii. Data presented in table 3.
Table 3. Efficacy of Trichoderma viride mother culture and mutants against Sclerotium rolfsii (per cent growth inhibition) at 7 DAI
Figure 1: Efficacy of Trichoderma viride mother culture and mutants against Sclerotium rolfsii at 7DAI
Induced mutation is one of the most widely used tools to get variants which might have improved biocontrol properties like survival ability, antagonistic and biocontrol potential and ability to colonize plant parts (Baker, 1991). Current findings are in agreement with Papavizas and Lewis (1982) who evaluated the UV induced biotypes of T. viride differed considerably from WT 6 in appearance, growth habit and fungitoxic metabolite production and also effectively arrested the growth of Rhizoctonia solani of cotton and radish and Sclerotium lepillorum of onion. Chaudhary (2009) also evaluated biopesticides Niprot (Trichoderma viride) for calibration of dosage extent and suppression of collar rot caused by S. rolfsii and observed that Niprot was able to suppress the disease. Mohamed et al. (2010) adopted UV treatment for mutagenesis of Trichoderma viride to enhance three effective hydrolytic enzymes viz., chitinase, β-1, 3- galactoronase and cellulases which having
biocontrol abilities against S.rolfsii. In the present investigation efforts have been made to generate efficient mutants of T. viride having more antagonistic potential against soil borne pathogens and enzymic activities compared to mother culture.
4. Efficacy of Trichoderma viride mother culture and mutants against
Rhizoctonia bataticola (per cent growth inhibition) at 7 DAI.
All the Trichoderma viride mutants were significant in inhibiting the radial mycelial growth of R. bataticola. The efficient treatment was T8 (TVME 3b) i.e. 64.19% which was at par with T5 (TVME2b) and T7 (TVME3a) i.e. 63.47 and 62.94%. The lowest per cent growth inhibition of Rhizoctonia bataticola was found by T16 (TVME4c) i.e. 45.42%. Data are presented in table 4.
PGI - Per cent growth inhibition
Patil and Kamble (2011) obtained five T. koningii mutants by UV treatments with different time variables. Among these five mutants T.koningii - 2 showed maximum antagonistic activity against R. bataticola causing charcoal rot in vitro.
Table 4. Efficacy of Trichoderma viride mother culture and mutants against Rhizoctonia bataticola (Percent growth inhibition) at 7DAI
Figure 2: Efficacy of Trichoderma viride mother culture and mutants against Rhizoctonia bataticola at 7 DAI
Efficacy of Trichoderma viride mother culture and mutants against
Fusarium oxysporum f. sp.ciceri (per cent growth inhibition) at 7 DAI
All the Trichoderma viride mutants were significant in inhibiting the radial mycelial growth of Fusarium oxysporum f.sp.ciceri the efficient
treatment was T5 (TVME 2b) i.e. 63.50% which was at par with T6 (TVME2c) T9(TVME3c) and T13 (TVGM1) i.e. 62.88 and 62.03 and 60.74%. The lowest per cent growth inhibition of Fusarium oxysporum f.sp.ciceri was found by T16 (TVGM4) i.e. 47.77 %. Data are presented in table 5.
Table 5: Efficacy of Trichoderma viride mother culture and mutants against Fusarium oxysporum f. sp. ciceri (per cent growth inhibition) at 7 DAI
Figure 3: Efficacy of Trichoderma viride mother culture and mutants against Fusarium oxysporum f. sp. ciceri at 7DAI
Inhibition of Fusarium udum by Trichoderma was also reported by Papavizas (1985).Padamodaya and Reddy (1996) screened ten isolates of Trichoderma spp. For arresting the growth of Fusarium oxysporum in vitro and reported that T. viride was highly inhibitory in dual culture. Present investigations are in agreement with Mohamed et al. (2006) who obtained two stable salt tolerant mutants having great biological proficiency against Fusarium oxysporum the causal agent of tomato wilt disease.
The present work aimed to apply the mutagenesis and irradiation techniques for genetically improvement of the bioagents Trichoderma viride to enhance their biocontrol abilities against predominant soil borne fungal pathogens viz., Fusarium oxysporum f. sp. ciceri, Sclerotium rolfsii and Rhizoctonia bataticola. These are important soil borne fungal pathogens affecting wide range of hosts and have a worldwide distribution on numerous field crops and vegetables.
The present investigation entitled “Improvement in biocontrol ability of Trichoderma viride through mutation” was carried out during 2019-20 at Department of Plant Pathology, Dr. Panjabrao Deshmukh Krishi vidyapeeth, Akola. The objectives of the studies were
1. Induction of mutation in Trichoderma viride.
2. To asses the antagonistic effect of Trichoderma viride against predominant soil borne pathogen.
Mutagenesis and irradiation was found to be the novel strategy for developing Trichoderma mutants with enhanced biocontrol abilities. Trichoderma viride mother culture obtained from Department of Plant Pathology, PGI, Dr. PDKV Akola and it was subjected to chemical mutagenesis i.e. Ethyl methane Sulphonate (EMS) @ 100,150,200 and 250 µl/ml for time interval at 30,45 and 60 minutes. The sporulate culture of Trichoderma viride irradiated at (cobalt-60) 0,20,30,40 and 50 k-rad, It was done at BARC, Mumbai. Total sixteen mutants were obtained from chemical mutagenesis and gamma irradiation. Mother culture of Trichoderma viride and its mutants were tested for their antagonistic potential against soil borne plant pathogens, viz., Sclerotium rolfsii, Rhizoctonia bataticola, Fusarium oxysporium f.sp.ciceri.by dual culture technique.
Morphological character of efficient mutants of Trichoderma viride were tested upto sixth generation to check their stability. Trichoderma viride mutants exhibited morphological variation such as growth rate, colony diameter, colony type, colony colour, pigmentation, phialides, and sporulation. Mutants were differed in their biocontrol potential against soil borne pathogen as well as chitinase enzyme content.
Among the mutants most of them were found effective against Slerotium rolfsii, Rhizoctonia bataticola, Fusarium oxysporium f.sp. ciceri, than mother culture, in dual culture technique. The mutant TVME 3b, TVGM1, TVME2b and TVME2c exhibited maximum antagonistic activity against Slerotium rolfsii which showed, 65.10, 64.59, 64.47 and 62.37 per cent growth inhibition respectively. In case of Rhizoctonia bataticola, the mutants TVME 2b, TVME3b, TVME 1a and TVME2a exhibited maximum per cent growth inhibition i.e. 62.43,62.40,61.64 and 61.56 per cent respectively.Fusarium oxysporium f.sp.ciceri was also highly inhibited by mutants TVME 2b, TVME2c, TVME 3c and TVGM1 and it showed maximum per cent growth inhibition i.e. 61.68,60.60,59.41 and 58.90 per cent respectively.
The mutants were assayed for estimation of chitinase enzyme and the mutants TVME 2b, TVME 2cand TVME 3c and TVGM1 found to possesses highest chitinase enzyme units/mg of protein i.e. 0.64, 0.63, 0.63 and 0.62 respectively.
The ability of high quantum of chitinase with higher growth rate and sporulation was directly related to maximum inhibition ability of mutants.
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Dear Dr. Jessica Magne, Editorial Coordinator 0f Clinical Cardiology and Cardiovascular Interventions, I hope this message finds you well. I want to express my utmost gratitude for your excellent work and for the dedication and speed in the publication process of my article titled "Navigating Innovation: Qualitative Insights on Using Technology for Health Education in Acute Coronary Syndrome Patients." I am very satisfied with the peer review process, the support from the editorial office, and the quality of the journal. I hope we can maintain our scientific relationship in the long term.
Dear Monica Gissare, - Editorial Coordinator of Nutrition and Food Processing. ¨My testimony with you is truly professional, with a positive response regarding the follow-up of the article and its review, you took into account my qualities and the importance of the topic¨.
Dear Dr. Jessica Magne, Editorial Coordinator 0f Clinical Cardiology and Cardiovascular Interventions, The review process for the article “The Handling of Anti-aggregants and Anticoagulants in the Oncologic Heart Patient Submitted to Surgery” was extremely rigorous and detailed. From the initial submission to the final acceptance, the editorial team at the “Journal of Clinical Cardiology and Cardiovascular Interventions” demonstrated a high level of professionalism and dedication. The reviewers provided constructive and detailed feedback, which was essential for improving the quality of our work. Communication was always clear and efficient, ensuring that all our questions were promptly addressed. The quality of the “Journal of Clinical Cardiology and Cardiovascular Interventions” is undeniable. It is a peer-reviewed, open-access publication dedicated exclusively to disseminating high-quality research in the field of clinical cardiology and cardiovascular interventions. The journal's impact factor is currently under evaluation, and it is indexed in reputable databases, which further reinforces its credibility and relevance in the scientific field. I highly recommend this journal to researchers looking for a reputable platform to publish their studies.
Dear Editorial Coordinator of the Journal of Nutrition and Food Processing! "I would like to thank the Journal of Nutrition and Food Processing for including and publishing my article. The peer review process was very quick, movement and precise. The Editorial Board has done an extremely conscientious job with much help, valuable comments and advices. I find the journal very valuable from a professional point of view, thank you very much for allowing me to be part of it and I would like to participate in the future!”
Dealing with The Journal of Neurology and Neurological Surgery was very smooth and comprehensive. The office staff took time to address my needs and the response from editors and the office was prompt and fair. I certainly hope to publish with this journal again.Their professionalism is apparent and more than satisfactory. Susan Weiner
My Testimonial Covering as fellowing: Lin-Show Chin. The peer reviewers process is quick and effective, the supports from editorial office is excellent, the quality of journal is high. I would like to collabroate with Internatioanl journal of Clinical Case Reports and Reviews.
My experience publishing in Psychology and Mental Health Care was exceptional. The peer review process was rigorous and constructive, with reviewers providing valuable insights that helped enhance the quality of our work. The editorial team was highly supportive and responsive, making the submission process smooth and efficient. The journal's commitment to high standards and academic rigor makes it a respected platform for quality research. I am grateful for the opportunity to publish in such a reputable journal.
My experience publishing in International Journal of Clinical Case Reports and Reviews was exceptional. I Come forth to Provide a Testimonial Covering the Peer Review Process and the editorial office for the Professional and Impartial Evaluation of the Manuscript.
