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THE PLANT CELL, Vol 4, Issue 11 1443-1451, Copyright © 1992 by American Society of Plant Biologists

RESEARCH ARTICLES

Definition and Functional Implications of Gibberellin and Abscisic Acid cis-Acting Hormone Response Complexes

J. C. Rogers and S. W. Rogers
Division of Hematology-Oncology, Washington University School of Medicine, St. Louis, Missouri 63110

The mechanisms by which cis-acting hormone response elements affect transcription is unclear. In this study, we demonstrated that a second "coupling element," identified as O2S, must be present to allow a single copy of either the gibberellin response element (GARE) or the abscisic acid response element (ABRE) to mediate their hormonal effects in the barley Amy32b [alpha]-amylase gene promoter. The interactive effects of the O2S and the GARE are constrained positionally and spatially; thus, together they form a gibberellin response complex (GARC). The absolute requirement of the O2S for function of the ABRE demonstrates that these together form an abscisic acid response complex (ABRC). A second copy of the GARE can substitute for the O2S in the GARC, but only in one orientation. By expressing the GARC-containing and ABRC-containing promoters in developing aleurone tissue, we showed that hormonal effects prevent [alpha]-amylase gene expression during the second half of grain development, but other mechanisms suppress expression earlier. Our results suggest that the specific sequence serving as a coupling element in a given gene promoter will greatly affect where and when the GARE or ABRE will be able to regulate transcription.


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