THE EFFECT OF ABSCISIC ACID ON STOMATAL BEHAVIOUR IN FLACCA, A WILTY MUTANT OF TOMATO, IN DARKNESS

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Abstract
Summary: Young plants of the wilty tomato mutant, flacca, in which the stomata resist closure, were sprayed with abscisic acid eight times over a period of 24 hours in light and darkness. The hormone induced closure of stomata similarly in leaves treated either in light or in darkness. Abscisic acid does not appear to induce stomatal closure in darkness by increasing the internal CO2 concentration in the leaf, since this concentration should already be very high in darkness. A considerable and rapid decrease of CO2 assimilation and increase of CO2 evolution were demonstrated in mutant as well as in normal plants transferred from light to darkness.