生长素
生物
串扰
植物激素
拟南芥
细胞生物学
生物发生
突变体
激素
发育可塑性
生物化学
基因
可塑性
热力学
光学
物理
作者
Anna N. Stepanova,Joyce Marie Robertson-Hoyt,Jeonga Yun,Larissa M. Benavente,De‐Yu Xie,Karel Doležal,Alexandra Schlereth,Gerd Jürgens,José M. Alonso
出处
期刊:Cell
[Elsevier]
日期:2008-04-01
卷期号:133 (1): 177-191
被引量:1017
标识
DOI:10.1016/j.cell.2008.01.047
摘要
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.
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