拟南芥色氨酸与吲哚乙酸生物合成的研究进展

拟南芥色氨酸生物合成途径的研究已逐渐成为植物分子生物学家了解植物基因结构和表达调控最主要的模式系统之一。到目前为止，编码拟南芥色氨酸合成途径的七种酶蛋白的基因已经全部被克隆，并进行了不同程度的分子生物学研究。长期以来，色氨酸一直被认为是植物生长素吲哚乙酸（ＩＡＡ）生物合成（从头合成）的前体物，但近年来人们发现生长素合成的非色氨酸途径可能是其在植物中生物合成的主要途径。植物在不同的发育阶段可能采用不同的方式合成ＩＡＡ。

Progress in Plant Tryptophan and Indole 3 acetic Acid Biosynthesis

Arabidopsis tryptophan biosynthetic pathway has become an important model system to study palnt gene structure, expression and regulation.Genes encoding enzymes of the tryptophan biosynthetic pathway in Arabidopsis thaliana have been cloned and characterized in detail. Tryptophan had been regarded as the precursor of the biosynthesis ( de novo ) of plant hormone indole 3 acetic acid (IAA) in the past decades. However, recent results indicated that the non tryptophan pathway might be the main pathway of IAA biosynthesis in most higher plants. Plants appear to have different routes to synthesized IAA at different developmental stages.