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Induction of Crassulacean Acid Metabolism in the Facultative Halophyte Mesembryanthemum crystallinum by Abscisic Acid
Chun Chu, Ziyu Dai, Maurice S. B. Ku and Gerald E. Edwards
Vol. 93, No. 3 (Jul., 1990), pp. 1253-1260
Published by: American Society of Plant Biologists (ASPB)
Stable URL: http://www.jstor.org/stable/4272971
Page Count: 8
You can always find the topics here!Topics: Plants, Leaves, Enzymes, Enzyme activity, Acidity, Salts, Complementary therapies, Crassulacean acid metabolism, Dehydration, Ethanol
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The facultative halophyte, Mesembryanthemum crystallinum, shifts its mode of carbon assimilation from the C3 pathway to Crassulacean acid metabolism (CAM) in response to water stress. In this study, exogenously applied abscisic acid (ABA), at micromolar concentrations, could partially substitute for water stress in induction of CAM in this species. ABA at concentrations of 5 to 10 micromolar, when applied to leaves or to the roots in hydroponic culture or in soil, induced the expression of CAM within days (as indicated by the nocturnal accumulation of total titratable acidity and malate). After applying ABA there was also an increase in phosphoenolpyruvate carboxylase and NADP-malic enzyme activities. The degree and time course of induction by ABA were comparable to those induced by salt and water stress. Electrophoretic analyses of leaf soluble protein indicate that the increases in phosphoenolpyruvate carboxylase activity during the induction by ABA, salt, and water stress are due to an increase in the quantity of the enzyme protein. ABA may be a factor in the stress-induced expression of CAM in M. crystallinum, serving as a functional link between stress and biochemical adaptation.
Plant Physiology © 1990 American Society of Plant Biologists (ASPB)