National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Amongst the oilseed crops, rapeseed and mustard (Brassica spp.) play a central role in agricultural economy of the world. These crops are affected by a number of diseases which limit productivity of the crop over a wide area and one of these is Alternaria blight disease. Causal agent Alternaria brassicae, hemibiotrophic in nature and shows more propensity towards necrotrophy. Jasmonic acid (JA) acts as a defense signal against this necrotrophic pathogen by triggering Induced Systemic Resistance and induces defensin genes (PDF1.2) expression in A. thaliana leaves challenged with fungal pathogens. A study on effect of jasmonate on disease progression as well as induction of defensin gene (PDF1.2) was carry out to explore the effectiveness of Jasmonic acid in triggering defence within the host tissues. The disease severity and expression of PDF1.2 gene was examined after treatment containing Jasmonic acid and pathogen to two ecotypes of Arabidopsis at different time intervals. Methyl jasmonate treatment was found to be effective in decreasing the disease incidence by lowering the disease index in both susceptible (WS) and tolerant ecotype (Col). Transcripts of PDF1.2 accumulated at a greater level upon challenge inoculation with A. brassicae along with Jasmonic acid compared to treatment containing pathogen alone as well as Jasmonic acid alone. These results suggest the involvement of JA signaling pathways conferring resistance to A. brassicae.
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