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To cope with drought, plants display a variety of physiological and biochemical responses at the cellular and whole-organism levels 1. Various plant hormones, especially abscisic acid (ABA), regulate water consumption and drought tolerance in plants 2, 3. Under drought conditions, the endogenous ABA level dramatically increases in plants, which reduces transpiration rates by inducing stomatal closure 4, 5.
Moreover, ABA induces an accumulation of compatible solutes, such as sorbitol, proline, glycine-betaine, and small hydrophilic proteins, that confer stress tolerance by decreasing the osmotic potential in plant cells 2. Therefore, ABA can be considered a water stress-related phytohormone that contributes to the dehydration and desiccation tolerance of cells.