ROS mediated response in blister blight disease compatibility of tea [Camellia sinensis (L.) O. Kuntze]

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Research Article

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Archives of Phytopathology and Plant Protection


Blister blight, caused by the basidiomycete Exobasidium vexans infecting on the young leaves and shoots, influence greatly in the production and quality of tea. In-planta metabolic regulations vary with the stress tolerance aptitude of the genotypes. Reactive oxygen species (ROS), secondary metabolites, and antioxidative enzymes are among such parameters that have a significant impact in conferring tolerance. In situ ROS accumulation, oxidative damage, and subsequent enzymatic and non-enzymatic indicators in tender leaves of two each of susceptible (Happy Valley-39, Tukdah-78) and tolerant genotypes (Amberi valai-2, Phoobsering-312) were considered. The tolerant genotypes exhibited higher ROS, lipid peroxidation, and total protein content compared to the sensitive ones. Oxidative responses enumerate in terms of superoxide anion (O2−), hydrogen peroxide (H2O2), and malondialdehyde, triggered activity of stress-responsive enzymes like superoxide dismutase, catalase, peroxidase, and glutathione S-transferase. Non-enzymatic secondary metabolites, especially flavonols were observed to be augmented in the sensitive genotypes.

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