Abstract
Nitric oxide (NO) is a crucial gasotransmitter which in recent times is also being considered as an important phytohormone. The signaling molecule acts as a secondary messenger during abscisic acid (ABA)-mediated stomatal closure and guard cell regulation during water scarcity. Desiccation is the most common type of suboptimal condition experienced by the plant system, since almost all kinds of abiotic stress induce dehydration within the cell. As a result, regulated transpiration is essential for successful survival of the entire system. The importance of NO in stomatal regulation and guard cell signaling is immense. The current chapter concisely identifies the intricate roles of NO in stomatal closure and signaling especially when the plants are experiencing cellular flaccidity due to desiccation.
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