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Effects of exogenous Spd and CHA on endogenous (A) Put, (B) Spd, and (C) Spm content of rice seeds at different developmental stages under high temperature (40 °C, 5 days). The bars mean standard deviation and different letters indicate significant differences between treatments at the same developmental stage (α = 0.05, LSD). The treatment methods were the same as those in the Figure 1 notes.
