Which one of the following generally acts as an antagonist to gibberellins?
Which one of the following generally acts as an antagonist to gibberellins?
Zeatin
Ethylene
ABA
IAA
Solution
Abscisic acid (ABA) is also called stress hormone. It is a mildly acidic growth hormone which functions as a general growth inhibitor by counteractig other hormones (auxin, gibberelliun, cytokinin) or reactions mediated by them. It causes stomatal closure, abscission of flower and fruits while gibberellin helps in opening of stomata and promote development of fruits.