Extragenic suppressors of the Arabidopsis gai mutation alter the dose-response relationship of diverse gibberellin responses.
Plant Physiol
; 119(4): 1199-208, 1999 Apr.
Article
en En
| MEDLINE
| ID: mdl-10198078
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.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Proteínas de Plantas
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Proteínas Represoras
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Arabidopsis
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Proteínas de Arabidopsis
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Giberelinas
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Mutación
Idioma:
En
Revista:
Plant Physiol
Año:
1999
Tipo del documento:
Article
País de afiliación:
Reino Unido
Pais de publicación:
Estados Unidos