|
type |
Journal Article |
authors |
Stepanova AN, Robertson-Hoyt J, Yun J, Benavente LM, Xie DY, Dolezal K, Schlereth A, Jürgens G, Alonso JM. |
title |
TAA1-mediated auxin biosynthesis is essential for hormone crosstalk and plant development |
journal |
Cell |
Activity |
2.6.1.27 |
Family |
2.6.1.27 |
sel |
selected |
ui |
18394997 |
year |
(2008) |
volume |
133 |
number |
1 |
pages |
177-91 |
| |
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. |
last changed |
2008/05/21 19:35 |
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