Distinct Characteristics of Indole-3-Acetic Acid and Phenylacetic Acid, Two Common Auxins in Plants.
Distinct Characteristics of Indole-3-Acetic Acid and Phenylacetic Acid, Two Common Auxins in Plants.
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DOI：
10.1093/pcp/pcv088
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发表时间：
2015-08
影响因子：
4.9
通讯作者：
Kasahara H
中科院分区：
文献类型：
--
作者：
Sugawara S;Mashiguchi K;Tanaka K;Hishiyama S;Sakai T;Hanada K;Kinoshita-Tsujimura K;Yu H;Dai X;Takebayashi Y;Takeda-Kamiya N;Kakimoto T;Kawaide H;Natsume M;Estelle M;Zhao Y;Hayashi K;Kamiya Y;Kasahara H
植物激素生长素在植物生长和发育的许多方面起着核心作用。IAA是研究最多的天然生长素，具有极性运输的性质。苯乙酸（PAA）也被认为是一种天然的生长素，但其在植物生长和发育中的作用仍不清楚。在这项研究中，我们表明，IAA和PAA有重叠的调节作用，但不同的运输特性，作为植物生长素。PAA广泛分布于维管和非维管植物中。虽然PAA的生物活性低于IAA，但在拟南芥的各种组织中，PAA的内源水平远高于IAA。PAA和IAA通过TIR 1/AFB途径调控拟南芥中同一组生长素反应基因。IAA在玉米胚芽鞘中主动形成浓度梯度以响应向重力刺激，而PAA则不，表明PAA不是以极性方式主动运输的。诱导的YUCCA（YUC）基因增加PAA代谢产物的水平在拟南芥中，表明含YUC黄素的单加氧酶可能在PAA的生物合成中发挥作用。我们的研究结果为不同类型的生长素调控植物生长发育提供了新的见解。
The phytohormone auxin plays a central role in many aspects of plant growth and development. IAA is the most studied natural auxin that possesses the property of polar transport in plants. Phenylacetic acid (PAA) has also been recognized as a natural auxin for >40 years, but its role in plant growth and development remains unclear. In this study, we show that IAA and PAA have overlapping regulatory roles but distinct transport characteristics as auxins in plants. PAA is widely distributed in vascular and non-vascular plants. Although the biological activities of PAA are lower than those of IAA, the endogenous levels of PAA are much higher than those of IAA in various plant tissues in Arabidopsis. PAA and IAA can regulate the same set of auxin-responsive genes through the TIR1/AFB pathway in Arabidopsis. IAA actively forms concentration gradients in maize coleoptiles in response to gravitropic stimulation, whereas PAA does not, indicating that PAA is not actively transported in a polar manner. The induction of the YUCCA (YUC) genes increases PAA metabolite levels in Arabidopsis, indicating that YUC flavin-containing monooxygenases may play a role in PAA biosynthesis. Our results provide new insights into the regulation of plant growth and development by different types of auxins.