Exogenous glutathione revealed protection to bacterial spot disease: Modulation of photosystem II and H2O2 scavenging antioxidant enzyme system in Capsicum annum L

Abstract

In a greenhouse, parallel two experiments were carried out for the estimation of the impact of exogenous GSH (reduced glutathione) on photosynthetic properties, the efficiency of the photosystem II, and the H2O2-scavenging mechanism in chilli (Capsicum annum L.) seedlings. On the bases of pathogenicity, resistant and susceptible verities were selected. The application of GSH increased the chlorophyll fluorescence parameters such as photochemical quantity yield (YII). It declined the excitation pressure (1-qP) of photosystem and production of non-regulated energy dissipation [Y (NO)] in Xanthomonas campestris treated chilli leaves. In the addition of GSH, accumulation of reactive oxygen species was down and maintained the activity of ROS-scavenging enzymes (enzymatic antioxidants) in resistant and susceptible plants. Consequently, GSH supplementation relieves inhibition of production of bacterial toxin and photosynthesis primarily by overwhelming stomatal limitations, enhancing the performance of photosystem, and modulating the antioxidant protection mechanism to defend chloroplasts from oxidation. The Present study confirmed that seed priming with GSH in chilli plants to relieve biotic stress.

Keywords

• Capsicum annum
• Antioxidant enzymes
• Glutathione
• Chlorophyll fluorescence