小さなペプチドは,長距離信号でアブシシス酸を介して口腔制御を調節する

Fuminori Takahashi^1,2, Takehiro Suzuki³, Yuriko Osakabe^4,5

¹Gene Discovery Research Group, RIKEN Center for Sustainable Resource Science, Tsukuba, Japan. fuminori.takahashi@riken.jp.

Nature

|April 6, 2018

まとめ

植物ペプチドホルモンのCLE25は根から葉までの水不足を信号しますこのペプチドはアブシシ酸の蓄積を調節し,口腔閉塞を制御し,アラビドプシスの脱水抵抗性を高める.

科学分野:

植物分子生物学
植物生理学
信号経路

背景:

植物ペプチドホルモンは成長と発達に不可欠です.
根から芽へのシグナリングは水不足の状況に適応するために不可欠です
アブシシ酸は口腔の動きを調節して水分流失を防ぐが,上流の移動信号は未確認のままである.

研究の目的:

根から芽への水不足通信に関与する移動信号分子を特定する.
植物の脱水反応におけるCLE25ペプチドの役割を明らかにする.
アラビドプシスのCLE25媒介信号伝達のメカニズムを調査する.

主な方法:

脱水ストレス下でのCLE25遺伝子発現の分析
根から葉へのCLE25ペプチドの移動を追跡する.
CLE25がアブシシス酸の蓄積と口腔閉塞に及ぼす影響を調査する.
CLE25反応におけるBARELY ANY MERISTEM (BAM) 受容体の役割を評価する.

主要な成果:

CLE25遺伝子発現は脱水ストレス下にある根で強化される.
根系由来CLE25ペプチドは血管組織を通って葉へと移動する.
CLE25はアブシシ酸の蓄積を調節し,脱水抵抗性を高めることで口腔閉塞を誘導する.
葉のBARELY ANY MERISTEM (BAM) 受容体は,CLE25媒介による脱水反応に不可欠である.

結論:

CLE25ペプチドは,アラビドプシスの水不足反応のための長距離移動信号として作用する.
CLE25-BAM受容体モジュールは,植物の脱水シグナル伝達経路の重要な構成要素です.
この発見は干ばつのストレス下での植物の適応メカニズムに洞察を与えてくれます

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