Chapter 31.3, Problem 1CC

Summary Introduction

To explain:

Why plants with mutant that produce excessive abscisic acid (ABA) are warmer than wild-types under normal, non-stressful circumstances.

Concept introduction:

ABA is a plant stress hormone that helps the plant to overcome drought conditions. It does so by helping in the closing of stomata. ABA causes water to flow out of guard cell and thus lessen its turgor. Hence, the stomata close.