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Catalase (CAT), ascorbate peroxidase (APX), superoxide dismutase (SOD), peroxidase (POD) accumulation in the xylem sap of rice as influenced by growth regulators under heat stress. HDT, HNT and AT stand for high day, high night, and ambient temperature, respectively. The lines on bars represent LSD value for the interaction of PGRs and heat stress (heat stress × PGR) at α = 0.05.
