BIOMOLECULES AND ENZYMES

Detailed explanation-1: -Abscisic acid (ABA) is a plant hormone . ABA functions in many plant developmental processes, including seed and bud dormancy, the control of organ size and stomatal closure.

Detailed explanation-2: -The plant hormone ABA accumulates after drought stress, and increases plant survival by inducing quick responses such as stomatal closure, and long-term responses such as extended growth inhibition, osmotic regulation, accumulation of cuticular wax, senescence, abscission and dormancy.

Detailed explanation-3: -Drought stress triggers an increase in the level of the plant hormone abscisic acid (ABA), which initiates a signaling cascade to close stomata and reduce water loss.

Detailed explanation-4: -ABA is a key hormone that regulates water status and stomatal movement. Under drought conditions, plants produce and accumulate increased amounts of ABA in the guard cells, and this induces stomatal closure to conserve water.

Detailed explanation-5: -Abscisic Acid. Abscisic acid is an important signaling phytohormone under drought stress (De Ollas et al., 2013). Abscisic acid plays a significant role in regulating stomatal closure, gene upregulation and compatible osmolyte synthesis.