Extragenic Suppressors of the Arabidopsis gai Mutation Alter the Dose-Response Relationship of Diverse Gibberellin Responses1
AUTOR(ES)
Peng, Jinrong
FONTE
American Society of Plant Physiologists
RESUMO
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.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=32004Documentos Relacionados
- Gibberellin Dose-Response Regulation of GA4 Gene Transcript Levels in Arabidopsis1
- Gibberellin Dose-Response Curves and the Characterization of Dwarf Mutants of Barley
- Oral Artesunate Dose-Response Relationship in Acute Falciparum Malaria
- Dose-response and competing risks
- Dose-Response Relationships in Radiation Induced Mutation. Saturation Effects in Streptomyces