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Subject: Biotechnology and molecular Biology × Author: Kurma, Devakrishna × End date: 2024 × Start date: 2020 × Type: Thesis ×
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    ThesisItemOpen Access
    Virtual screening of phytoalexin(s) of Brassica juncea as defense inducing molecule(s) against alternaria blight
    (G. B. Pant University of Agriculture and Technology, Pantnagar, 2022-08) Kurma, Devakrishna; Gohar Taj
    Brassica juncea is an important Rapeseed-mustard crop in India, accounting for more than 90% of the total area. It is used as sources of oil, vegetable and fodder. Brassica has a high potential yield in India, but there is a large gap between potential and actual yields, which is mostly due to biotic and abiotic stress. Alternaria blight is a serious disease among the biotic stresses. It causes huge economic losses in terms of both production and oil quality. Alternaria brassicae is the causal organism of Alternaria blight and can infect the host at any stage of development. Alternaria brassicae proteins MAT1, BETA-TUBULIN, and ALTA1 are involved in mating, motility, and spore germination activities respectively during the pathogenesis of Alternaria blight on Brassica spp. Physiochemical analysis through high Aliphatic Index (AI), Index of Instability and Grand Average of Hydropathy (GRAVY) reveals that all the three proteins were heat stable as well as hydrophobic proteins. In this study molecular docking-based approach was used to predict the above proteins of Alternaria brassicae as possible molecular target of phytoalexins during pathogenesis or defense response. I-TASSER was used to predict 3-D structures for above proteins which were subsequently docked with phytoalexins which included Camalexin, Glucobrassicin, Methoxybrassinin, Spirobrassinin, Indole- 3acetaldoxime N-oxide and also with the five standard fungicides. Among the phytoalexins, the results of docking of Glucobrassicin with the above target proteins showed good affinity as well as low docking score in the range of -8.57 to -3.97 whereas the fungicide Tebuconazole had docking score in the range of -5.47 to -1.24. Therefore, the phytoalexin Glucobrassicin could be used for the protection of Brassica plants against Alternaria blight. Further In-vitro studies and downstream validation would give way to use the Glucobrassicin phytoalexin(s) as a substitute for hazardous fungicides to control plant diseases.