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The Plant Cell, Vol. 13, 1791-1802, August 2001, Copyright © 2001,
American Society of Plant Biologists

Expression of Arabidopsis GAI in Transgenic Rice Represses Multiple Gibberellin Responses

Xiangdong Fu, Duraialagaraja Sudhakar1, Jinrong Peng2, Donald E. Richards, Paul Christou and Nicholas P. Harberd3

John Innes Centre, Norwich Research Park, Colney Lane, Norwich NR4 7UH, United Kingdom

3 To whom correspondence should be addressed. E-mail nicholas.harberd{at}bbsrc.ac.uk; fax 44-1603-450025

Bioactive gibberellins (GAs) are essential endogenous regulators of plant growth. GA signaling is mediated via GAI, a nuclear member of the GRAS family of plant transcription factors. Previous experiments have suggested that GAI is a GA-derepressible repressor of plant growth. Here we test this hypothesis by examining the effects of the expression of Arabidopsis GAI in transgenic Basmati rice. High-level expression of GAI caused dwarfism and reduced GA responses, and the strength of this effect was correlated with the level of transgene expression. In particular, the expression of GAI abolished the GA-mediated induction of rice aleurone {alpha}-amylase activity, thus implicating GAI orthologs in the well-characterized cereal aleurone GA response. The GA derepressible repressor model predicts that high-level expression of GAI should confer dwarfism, and these observations are consistent with this prediction.




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