Plant Physiol.
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Plant Physiology 67:1026-1031 (1981)
© 1981 American Society of Plant Biologists

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Articles

Characterization of a Gibberellin-Insensitive Dwarf Wheat, D6899 1

EVIDENCE FOR A REGULATORY STEP COMMON TO MANY DIVERSE RESPONSES TO GIBBERELLINS

Tuan-Hua David Ho2, Randall C. Nolan and David E. Shute

Department of Botany, University of Illinois, Urbana, Illinois 61801

The effects of gibberellin in two wheat varieties, Nainari 60 and D6899, have been studied. D6899 is a dwarf wheat having a single locus mutation, the Rht 3 gene ("Tom Thumb" gene), which is located on chromosome 4A. When compared with the standard height wheat variety, Nainari 60, D6899 does not have a slowdown in cellular metabolism such as respiration rate, protein content, rate of protein synthesis, and uptake of amino acids. The content of ATP is even higher in D6899. However, all of the gibberellin-mediated physiological processes that we have studied, including leaf elongation, synthesis and release of hydrolytic enzymes, and secretion of phosphate ions and reducing sugars in aleurone layers, are retarded in D6899. D6899 and Nainari 60 have essentially the same uptake and metabolism of gibberellin and their levels of endogenous inhibitors such as abscisic acid do not differ drastically. The dosage-response curve of the gibberellin-mediated {alpha}-amylase production indicates that a rate-limiting step, which is common to many of the diverse gibberellin responses, is partially blocked in D6899 wheat.

2 Send reprint requests to T. H. David Ho.

1 This research was supported by National Science Foundation Grant PCM 78-16143 to T. H. D. H.




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Copyright © 1981 by the American Society of Plant Biologists