The role of a nonpolar transport-type auxin in plant defense mechanism

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H02501
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 44030:Plant molecular biology and physiology-related
• Research Institution: Tokyo University of Agriculture and Technology
• Principal Investigator: Kasahara Hiroyuki 東京農工大学, (連合)農学研究科(研究院), 教授 (00342767)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: オーキシン / 植物ホルモン / 生体防御

Outline of Final Research Achievements

The plant hormone auxin plays an important role in the regulation of plant growth and development. In this study, we aimed to identify the biosynthetic genes of phenylacetic acid (PAA), a nonpolar transport-type auxin, in Arabidopsis and elucidate the role of PAA in plant defense using its biosynthetic mutants. Through analysis of candidate genes for PAA biosynthesis, we obtained results suggesting that the aldehyde oxidase family contributes to PAA biosynthesis. Moreover, it was suggested that aromatic aldehyde synthase, which synthesizes phenylacetaldehyde from phenylalanine, is involved in PAA biosynthesis.

Free Research Field

植物生化学

Academic Significance and Societal Importance of the Research Achievements

本研究は、ユニークな移動特性を持つ天然オーキシンのフェニル酢酸（PAA）が、シロイヌナズナにおいてフェニルアセトアルデヒドを経由して合成されている可能性を示した。このPAAは植物の生体防御に関与することがこれまでの研究で示されていることから、本研究の成果は植物の基本的な生体防御メカニズムの解明や、PAAの生合成酵素を標的とした新たな農薬の開発に繋がる可能性がある。