Abstract
Exogenous foliar application of β-aminobutyric acid (BABA) led to a significant reduction in disease severity in Brassica carinata caused by Alternaria brassicae. To get a better insight about changes in defence-related enzymes like phenylalanine ammonia lyase (PAL) and polyphenol oxidase (PPO), isoform analysis of superoxide dismutase (SOD) and peroxidase (POX) were studied. BABA-treated plants showed a significant increase in PAL, PPO enzyme activities and total phenolic content in response to pathogen inoculation. However, isoform analysis of SOD and POX revealed no change in isoform number but a quantitative change in activity was observed in response to pathogen.
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