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Paramasivam, M.
- Evaluation of gliotoxin phytotoxicity and gliotoxin producing Trichoderma virens for the suppression of damping off of tomato
Authors
1 Department of Plant Pathology, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai, Tamil Nadu, IN
2 Department of Plant Pathology, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Madurai, Tamil Nadu, IN
3 Nuclear Agriculture and Biotechnology Division, Bhabha Atomic Research Centre, Mumbai, IN
4 Department of Plant Pathology, Agricultural College and Research Institute, Tamil Nadu Agricultural University, Killikulam, Tamil Nadu, IN
5 Pesticide Toxicology Laboratory, Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, IN
6 Department of Plant Biotechnology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 35, No 3 (2021), Pagination: 187-195Abstract
Gliotoxin is a potent antibiotic showing antifungal activity against various phytopathogenic fungi. It is produced by Q strains of Trichoderma virens and gliotoxin non-producing strains of T. virens are designated as P strains. There is no detailed study on effect of gliotoxin on suppression of damping off of tomato caused by Pythium aphanidermatum and its phytotoxicity effect on tomato plants. Thus, the present study was carried out to assess the effect of gliotoxin on inhibition of mycelial growth of P. aphanidermatum, its phytotoxicity effect on tomato and its role on the suppression of damping off of tomato. Culture filtrates of Q strains of T. virens containing gliotoxin highly inhibited the mycelial growth of P. aphanidermatum compared to that of P strains of T. virens. Purified gliotoxin but not bis-thiomethyl gliotoxin effectively inhibited the mycelial growth of P. aphanidermatum. Tomato seeds treated with purified gliotoxin did not inhibit the germination of seeds, its ischolar_main and shoot length even at higher concentration that is at 1000 ppm (fivefold inhibitory concentration against P. aphanidermatum). Foliar spray of gliotoxin on tomato plants did not show any phytotoxic effect at lower concentration but showed scorching effect at higher concentration. Seed treatment with gliotoxin producing Q strains of T. virens showed greater suppression of damping-off tomato compared to P strains of T. virens. This study clearly showed that gliotoxin producing T. virens could be used in suppression of damping-off disease incidence in tomato.
Keywords
Bio-control, damping-off, gliotoxin, Trichoderma virens- Volatile Profiles as Affected by Rice Brown Plant Hopper and Yellow Stem Borer in Rice Landraces
Authors
1 Tamil Nadu Agricultural University, Coimbatore, 641003, IN
2 Agricultural College and Research Institute, Vazhavachanur, Thiruvannamalai 606753, IN
3 Horticultural College and Research Institute for Women, Navalur Kuttapattu, Trichy 620027, IN
Source
Indian Journal of Entomology, Vol 84, No 3 (2022), Pagination: 573-581Abstract
Rice (Oryza sativa L.,) plants release a complex profile of volatile organic compounds. Present study investigates the differences in volatile compounds from four rice landraces viz., Karuthakar, Norungan, Thavala Kanan and Varappu Kudaichan each under four conditions like healthy, mechanically damaged, and the ones infested by the brown plant hopper Nilaparvata lugens Stal and yellow stem borer Scirpophaga incertulas (Wlk.). The volatiles were collected using air entrainment method and characterized by the GCMS. Statistical analysis tools like clustering, principal component analysis and partial least square discriminant analysis were applied. Clear differences among the treatments were observed and certain volatile compound groups like terpenoids (squalene), unsaturated fatty acids (n-hexadecanoic, tetradecanoic and pentadecanoic acids), alkanes (heptacosane, tetracosane) were found. The statistical test of Partial Least Square Discriminant Analysis was found to be satisfactory in determining the compounds responsible for variations in treatments.Keywords
Rice landraces, Nilaparvata lugens, Scirpophaga incertulas, secondary metabolites, herbivore induced plant volatiles, terpenoids, fatty acids, esters, GCMS, Clustering analysis, multivariate analysisReferences
- Chen J N, Gao Q, Liu C J, Li D J, Liu C Q, Xue Y L. 2020. Comparison of volatile components in 11 Chinese yam (Dioscorea spp.) varieties. Food Bioscience doi: https://doi.org/10.1016/j.fbio.2020.100531.
- Dutton A, Mattiacci L, Amadò R, Dorn S. 2002. A novel function of the triterpene squalene in a tritrophic system. Journal of Chemical Ecology 28(1): 103-116.
- Hoballah M E F, Tamo C, Turlings T C. 2002. Differential attractiveness of induced odors emitted by eight maize varieties for the parasitoid Cotesia marginiventris: is quality or quantity important? Journal of Chemical Ecology 28(5): 951-968.
- Jones V P, Steffan S A, Wiman N G, Horton D R, Miliczky E, Zhang Q H, Baker C C. 2011. Evaluation of herbivore-induced plant volatiles for monitoring green lacewings in Washington apple orchards. Biological Control 56(1): 98-105.
- Krips O E, Willems P E L, Gols R, Posthumus M A, Gort G, Dicke M. 2001. Comparison of cultivars of ornamental crop Gerbera jamesonii on production of spider mite-induced volatiles, and their attractiveness to the predator, Phytoseiulus persimilis. Journal of Chemical Ecology 27(7): 1355-1372.
- Murungi L K, Kirwa H, Salifu D, Torto B., 2016. Opposing roles of foliar and glandular trichome volatile components in cultivated nightshade interaction with a specialist herbivore. PloS One 11(8): 1-20.
- Nakashima Y, Birkett M A, Pye B J, Powell W. 2006. Chemically mediated intraguild predator avoidance by aphid parasitoids: interspecific variability in sensitivity to semiochemical trails of ladybird predators. Journal of Chemical Ecology 32(9): 1989-1998.
- Pare P W, Tumlinson J H. 1999. Plant volatiles as a defense against insect herbivores. Plant Physiology 121(2): 325-332.