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Effects of exogenous ABA and fluridone (Flu) on endogenous ABA content (A), glycinebetaine (GB) content (B), choline content (C) and betaine aldehyde dehydrogenase (BADH) activity (D) in the seedlings of two maize cultivars under drought stress induced by PEG and control (C). The same letters on the top of the column within each variable are not significantly different among twelve treatments at the 0.05 level.
