オーキシン、アブシジン酸の生合成の分子生物学的研究(学会賞)

概要

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Plant hormone auxin (indole-3-acetic acid (IAA)) and abscisic acid (ABA) have important roles in almost all plant life including various environmental responses. Here, I report molecular studies of IAA and ABA biosynthesis, showing the importance of their biosynthetic sites. We first revealed that maize coleoptile tip is the vigorous biosynthesis site of IAA, and using this tissue we demonstrated the in vitro system of IAA synthesis from tryptophan. Aldehyde oxidase is a component of the in vitro system and expression of AAO1, a member of Arabidopsis aldehyde oxidase family, is significantly higher in auxin over producing mutant, surl, than in wild type. During course of our study of Arabidopsis Aldehyde oxidase gene family, we found AAO3 has an activity to produce ABA from abscisic aldehyde. It was clearly indicated that AAO3 acts an important role for drought induced ABA accumulation in Arabidopsis leaves and that the vascular systems might be the main site of the ABA synthesis.
植物化学調節学会の論文
2005-10-13