ABA plays a major role in seed dormancy. Seeds stay dormant for a number of reasons, such as waiting for proper water levels or warmth before germinating. Why would it be necessary for seeds to have some way to inactivate ABA when the conditions are right for germination?
They can successfully germinate at the right time, which may be very short. If ABA was never inactivated, the seed would remain dormant, and it wouldn’t reproduce. Its traits would be lost, and it can be said to have very low fitness.
