TAA1-mediated auxin biosynthesis is essential for hormone crosstalk and plant development.
Cell
; 133(1): 177-91, 2008 Apr 04.
Article
em En
| MEDLINE
| ID: mdl-18394997
ABSTRACT
Plants have evolved a tremendous ability to respond to environmental changes by adapting their growth and development. The interaction between hormonal and developmental signals is a critical mechanism in the generation of this enormous plasticity. A good example is the response to the hormone ethylene that depends on tissue type, developmental stage, and environmental conditions. By characterizing the Arabidopsis wei8 mutant, we have found that a small family of genes mediates tissue-specific responses to ethylene. Biochemical studies revealed that WEI8 encodes a long-anticipated tryptophan aminotransferase, TAA1, in the essential, yet genetically uncharacterized, indole-3-pyruvic acid (IPA) branch of the auxin biosynthetic pathway. Analysis of TAA1 and its paralogues revealed a link between local auxin production, tissue-specific ethylene effects, and organ development. Thus, the IPA route of auxin production is key to generating robust auxin gradients in response to environmental and developmental cues.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Arabidopsis
/
Triptofano Transaminase
/
Ácidos Indolacéticos
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
Estados Unidos