Enhancement of growth, defense response in brinjal and inhibitory potential of salicylic acid against Fusarium oxysporum f. sp. melongenae

摘要

The study was carried out to evaluate the effects of salicylic acid in enhancement of growth, defense response and inhibition of colony growth of Fusarium oxysporum f. sp. melongenae under in vitro condition. The collected seed samples were primed with different concentrations of salicylic acid for 3 h to assess its effect on brinjal seed germination and seedling vigor using paper towel method. Inhibitory effect of salicylic acid was also tested against F. oxysporum f. sp. melongenae using poisoned food technique. Hypersensitive response in salicylic acid treated seedlings was also studied. Among salicylic acid treatments, 20 mM for 3 h duration recorded maximum seed germination of 95% and seedling vigour of 874.6 over non-treated control. In addition, the treatment also stood best in inhibiting mycelial growth of the pathogen under in vitro condition and showed enhanced hypersensitive response in treated seedlings. Thus, the study suggested that salicylic acid at 20 mM concentration proved to be good in enhancement of seedling growth with significant inhibition of pathogen growth and also enhanced hypersensitive response in brinjal seedlings.