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PLANT PHYSIOLOGY , Vol 111, Issue 4 1051-1057, Copyright © 1996 by American Society of Plant Biologists
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CELL BIOLOGY AND SIGNAL TRANSDUCTION |
Central Roles for Potassium and Sucrose in Guard-Cell Osmoregulation
L. D. Talbott and E. Zeiger
Department of Biology, University of California, Los Angeles, California 90024
Osmoregulation in guard cells of intact, attached Vicia faba leaves grown
under growth chamber and greenhouse conditions was studied over a daily
light cycle of stomatal movements. Under both growth conditions guard cells
had two distinct osmoregulatory phases. In the first (morning) phase,
opening was correlated with K+ uptake and, to a lesser extent, sucrose
accumulation. In the second (afternoon) phase, in which apertures were
maximal, K+ content declined and sucrose became the dominant osmoticum.
Reopening of the stomata after a CO2-induced closure was accompanied by
accumulation of either K+ or sucrose, depending on the time of day,
indicating that a single environmental signal may use multiple
osmoregulatory pathways. Malate accumulation, correlated with K+ uptake,
was detected under growth chamber but not greenhouse conditions, whereas
Cl- was the main K+ counterion in the greenhouse. These results indicate
that guard-cell osmoregulation in the intact leaf depends on at least two
different osmoregulatory pathways, K+ transport and sucrose metabolism.
Furthermore, the relative importance of the K+ counterions malate and Cl-
appears to be environment-dependent.
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