Abstract
The present study focuses on the potency of sulfamethoxazole (Sm) on inducing resistance against Alternaria solani infection. Anatomical observation indicated calcium oxalate deposits in pathogen-infected tissue compared to control plants. Sm pretreated and pathogen-infected tomato leaves showed decreased accumulation of calcium oxalate crystals. The oxalic acid content is found decreased in Sm (3 µM) pretreated and pathogen-infected leaves at 36 h compared to control and pathogen-infection (PI). Sm treatment resulted in transient and significant increase in H2O2 level during early stages of PI. A significant increase in superoxide dismutase, guaiacol dependent peroxidase and polyphenol oxidase was evident in Sm treated leaves which altogether contributed to protection of tomato from oxidative stress due to PI. Sm treatment followed by PI resulted in accumulation of superoxide anion compared to A. solani infected plants. In conclusion, Sm treatment regulate balance between antioxidants and free radicals, induces antioxidant enzymes and thereby controlling pathogen ingress.
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