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Abstract
The role of exogenous GSH in improving abiotic stress tolerance in maize was investigated in this study. GSH-treated plants showed significantly higher germination percentage, survival rate, plant biomass, and grain yield per plant than control plants. The possible physiological mechanism underlying the tolerance phenotypes in GSH-treated plants were also analyzed in this study. GSH-treated plants showed reduced oxidative destruction, enhanced water retention, and increased activity of antioxidant enzyme, vacuolar H+-pyrophosphatase (V-H+-PPase), and H+-adenosine triphosphatase (V-H+-ATPase), compared to control plants. In addition, the accumulation of abscisic acid (ABA) and the expression of ABA-responsive genes were upregulated by GSH treatment. These results suggested that GSH played a role in relieving oxidative destruction, maintaining plant water content, and promoting higher ABA levels, which were responsible for GSH-enhanced tolerance to abiotic stresses in maize.
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