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THE EFFECT OF ABSCISIC ACID ON STOMATAL BEHAVIOUR IN FLACCA , A WILTY MUTANT OF TOMATO, IN DARKNESS
Author(s) -
TAL M.,
IMBER DOROT
Publication year - 1972
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1972.tb04812.x
Subject(s) - darkness , abscisic acid , mutant , botany , assimilation (phonology) , biology , chemistry , horticulture , biochemistry , philosophy , gene , linguistics
S ummary 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 CO 2 concentration in the leaf, since this concentration should already be very high in darkness. A considerable and rapid decrease of CO 2 assimilation and increase of CO 2 evolution were demonstrated in mutant as well as in normal plants transferred from light to darkness.