Why is abscisic acid known as stress hormone?

Abscisic acid is referred to as stress hormone as it causes different plant responses acting against stress conditions. It facilitates the seed dormancy and ensures seed germinates under favourable circumstances. It also causes the closing of stomata when there is a drought. They are also critical in withstanding desiccation. Furthermore, they also assist to induce dormancy in plants towards the end of the growing season, facilitating abscission of fruits, leaves and flowers.

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