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Extragenic Suppressors of the Arabidopsis gai Mutation Alter the Dose-Response Relationship of Diverse Gibberellin Responses1

Jinrong Peng, Donald E. Richards, Thomas Moritz, Ana Caño-Delgado, and Nicholas P. Harberd*

Department of Molecular Genetics, John Innes Centre, Colney Lane, Norwich NR4 7UJ, United Kingdom (J.P., D.E.R., A.C.-D., N.P.H.); and Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, S-90183, Umeå, Sweden (T.M.)

Active gibberellins (GAs) are endogenous factors that regulate plant growth and development in a dose-dependent fashion. Mutant plants that are GA deficient, or exhibit reduced GA responses, display a characteristic dwarf phenotype. Extragenic suppressor analysis has resulted in the isolation of Arabidopsis mutations, which partially suppress the dwarf phenotype conferred by GA deficiency and reduced GA-response mutations. Here we describe detailed studies of the effects of two of these suppressors, spy-7 and gar2-1, on several different GA-responsive growth processes (seed germination, vegetative growth, stem elongation, chlorophyll accumulation, and flowering) and on the in planta amounts of active and inactive GA species. The results of these experiments show that spy-7 and gar2-1 affect the GA dose-response relationship for a wide range of GA responses and suggest that all GA-regulated processes are controlled through a negatively acting GA-signaling pathway.

1   This work was made possible by a Biotechnology and Biological Sciences Research Council Core Strategic Grant to the John Innes Centre, by Agricultural and Food Research Council/Biotechnology and Biological Sciences Research Council Plant Molecular Biology grants PG208/520 and PG208/0600, by the European Commission DG XII Biotechnology Program (contract no. BIO4-96-0621), by the Foundation for Strategic Research, and by the Swedish Natural Science Research Council.
*   Corresponding author; e-mail harberd{at}bbsrc.ac.uk; fax 44-1603-505725.

Plant Physiol. (1999) 119: 1199-1208
Copyright Clearance Center:   0032-0889/99/119//10
© 1999 American Society of Plant Physiologists




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