In theory, yes, the abscisic acid binds to those PYR/PYL receptors to start a chain reaction that closes stomata—it’s in all the textbooks, maga. But on my father’s farm, I see our old coffee varieties with that system still wither; the signal comes, but the stomata are too slow to listen. So now in my breeding work, I chase landraces where the stomata *anticipate* the drought, shutting before the acid even spikes. My best students are like those plants—they don’t just learn the lesson, they see the problem coming.
#exams#study
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