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Plant Physiology 76:143-147 (1984)
© 1984 American Society of Plant Biologists

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Articles

Low Temperature-Induced GA3 Sensitivity of Wheat 1

II. Changes in Lipids Associated with the Low Temperature-Induced GA3 Sensisivity of Isolated Aleurone of Kite

Surinder Pal Singh and Leslie G. Paleg

Department of Plant Physiology, Waite Agricultural Research Institute, University of Adelaide, Glen Osmond, S.A. 5064, Australia

Exposure of isolated aleurone tissue from the wheat (Triticum aestivum) variety Kite which contains the Rht2 allele, to low temperature (5°C) for 20 h prior to addition of exogenous GA3, resulted in significant changes in the content of lipids, especially phospholipids. Significant low temperature-induced changes in both the head group and acyl contents of two phospholipids, phosphatidylcholine and phosphatidylethanolamine, were detected. More importantly, these changes displayed a very close temporal relationship with the low temperature-induced increase in GA3 sensitivity. Further, this relationship was paralleled by a highly significant correlation between the changes in the phospholipids and the changes in {alpha}-amylase production. These results underline the possibility that the GA3 receptor sites are membrane-based lipids.

1 Supported by a University of Adelaide Postgraduate Scholarship to S. P. S.




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K. Mrva, M. Wallwork, and D. J. Mares
{alpha}-Amylase and programmed cell death in aleurone of ripening wheat grains
J. Exp. Bot., March 1, 2006; 57(4): 877 - 885.
[Abstract] [Full Text] [PDF]


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