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Plant Physiology 59:295-300 (1977)
© 1977 American Society of Plant Biologists

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Articles

Water Stress and Protein Synthesis

V. Protein Synthesis, Protein Stability, and Membrane Permeability in a Drought-sensitive and a Drought-tolerant Moss 1

Rajinder S. Dhindsa and J. Derek Bewley

a Department of Biology, University of Calgary, Calgary, Alberta T2N 1N4 Canada

The effects have been studied of water stress and desiccation on protein synthesis in the drought-tolerant moss Tortula ruralis and the drought-sensitive moss Hygrohypnum luridum. At any particular level of steady state water stress, the inhibition of protein synthesis was greater in H. luridum than in T. ruralis. Water stress-induced changes in the pattern of protein synthesis, as determined by the double label ratio technique, were minor in T. ruralis, but major in H. luridum. Proteins of both mosses were found to be stable during desiccation and subsequent rehydration. Changes in membrane permeability, as indicated by the leakage of amino acid, were observed during rehydration of desiccated moss and were dependent on the rate of desiccation. The leakage was small and reversible in T. ruralis but large and irreversible in H. luridum. Although H. luridum failed to recover from complete desiccation (80% loss in fresh weight), it was able to recover fully from steady state stress under conditions where a maximum loss of 55% in fresh weight was recorded.

1 Work supported by National Research Council of Canada Grants A-6352 and E-2550, and appropriations from the University of Calgary.




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 Mol PlantHome page
A. J. Charron and R. S. Quatrano
Between a Rock and a Dry Place: The Water-Stressed Moss
Mol Plant, May 1, 2009; 2(3): 478 - 486.
[Abstract] [Full Text] [PDF]


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Copyright © 1977 by the American Society of Plant Biologists