Abstract：
Auxins are a class of plant hormones playing crucial roles in a plant\'s growth, development, and stress responses. Phenylacetic acid (PAA) is a phenylalanine-derived natural auxin found widely in plants. Although the auxin activity of PAA in plants was identified several decades ago, PAA homeostasis and its function remain poorly understood, whereas indole-3-acetic acid (IAA), the most potent auxin, has been used for most auxin studies. Recent studies have revealed unique features of PAA distinctive from IAA, and the enzymes and intermediates of the PAA biosynthesis pathway have been identified. Here, we summarize the occurrence and function of PAA in plants and highlight the recent progress made in PAA homeostasis, emphasizing PAA biosynthesis and crosstalk between IAA and PAA homeostasis.
摘要：
生长素是一类在植物生长中起关键作用的植物激素，发展,和应激反应。苯乙酸(PAA)是广泛存在于植物中的苯丙氨酸衍生的天然生长素。尽管PAA在植物中的生长素活性在几十年前就已被发现，PAA稳态及其功能仍然知之甚少，而吲哚-3-乙酸（IAA），最有效的生长素，已用于大多数生长素研究。最近的研究揭示了PAA与IAA不同的独特特征，并鉴定了PAA生物合成途径的酶和中间体。这里,本文总结了PAA在植物中的发生和功能，并重点介绍了PAA稳态的最新进展，强调PAA的生物合成以及IAA和PAA稳态之间的串扰。
