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Induction of Salicylic Acid in Cucumber Plants Against Cucumber Mosaic Cucumovirus Using Biotic Inducers

Induction of Salicylic Acid in Cucumber Plants Against Cucumber Mosaic Cucumovirus Using Biotic Inducers

Systemic Acquired Resistance (SAR) could be induced in cucumber plants using different individual of seven microbial isolates against Cucumber mosaic Cucumovirus (CMV). These isolates were Bacillus subtilis, Bacillus polymyxa, Bacillus circulans, Pseudomonas putida, Pseudomonas fluorescens 2 and Pseudomonas fluorescens 8 as bacterial isolates and Trichoderma harzianum as fungal isolate. The occurrence of SAR was found by seed treatment with microbial liquid culture based on virus infectivity and the level of free and endogenous salicylic acid (SA), 14 days from CMV inoculation. Seven biotic inducers reduced CMV infectivity at range 16.6 to 39% and T. harzianum gave the highest percentage of reduction 39%. In addition, the level of total SA has been increased in treated plants, B. subtilis gave the highest level of SA 239.13 μg g-1 fresh weight (fwt) while, B. circulans gave the lowest level 70.1 μg g-1 fwt.

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