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Plant Physiology 99:759-761 (1992)
© 1992 American Society of Plant Biologists

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Environmental and Stress Physiology

Induction of mRNA for Phosphoenolpyruvate Carboxylase Is Correlated with a Decrease in Shoot Water Content in Well-Irrigated Mesembryanthemum crystallinum 1

Jürgen M. Schmitt and Mechtild Piepenbrock

Institut für Pflanzenphysiologie und Mikrobiologie, Freie Universität, 1 Berlin 33, Germany

The abundance of mRNA specific for phosphoenolpyruvate carboxylase (PEPCase) was measured in leaves from well-watered plants of Mesembryanthemum crystallinum. Plants grown side by side in pots of four different volumes (0.16, 0.74, 2.6, 6.5 liters) were compared. The time of increase in the steady-state level of PEPCase mRNA in well-watered plants was dependent on soil volume. The larger the pot, the later PEPCase transcripts were increased. PEPCase mRNA induction started when shoot water content decreased to well below 4000% of dry weight. No positive correlation with the developmental status of the plants could be found. The data indicate that PEPCase mRNA induction in well-watered plants up to 10 weeks of age is controlled environmentally rather than developmentally.

1 This work was supported by Deutsche Forschungsgemeinschaft.




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K. Winter and J. A.M. Holtum
Environment or Development? Lifetime Net CO2 Exchange and Control of the Expression of Crassulacean Acid Metabolism in Mesembryanthemum crystallinum
Plant Physiology, January 1, 2007; 143(1): 98 - 107.
[Abstract] [Full Text] [PDF]


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Copyright © 1992 by the American Society of Plant Biologists