根の発達と結節の発射制御は,受容体のようなキナーゼによって媒介されます

Lene Krusell¹, Lene H Madsen, Shusei Sato

¹Laboratory of Gene Expression, Department of Molecular Biology, University of Aarhus, Gustav Wieds Vej 10, 8000 Aarhus C, Denmark.

Nature

|November 21, 2002

まとめ

植物の根の結節形成は,豆類の共生を制御する遺伝子によって調節されます. この遺伝子の変異により,ノドルの過剰な成長が起こり,窒素の固定と植物の発達に影響を及ぼします.

科学分野:

植物生物学植物生物学
分子遺伝学分子遺伝学
微生物の共生は微生物の共生である.

背景:

レギュームの根ノードルのオーガノゲネシスは,リゾビアルリポキチンオリゴサッカリドによって誘発されます.
根の結節は,植物栄養に不可欠なプロセスである共生的な窒素固定を促進します.
結節形成は,過剰な成長を防ぐために,結節の自己調節 (AON) によって緊密に規制されます.

研究の目的:

結節の自己調節 (AON) の分子基礎を調査する.
ロータス・ジャポニカス (Lotus japonicus) とその pea orthologue の HAR1 遺伝子を特定し,特徴づけること.
ノードル数と共生性の発達を調節するHAR1の役割を理解する.

主な方法:

HAR1遺伝子の分子クローニングと,その pea orthologue.
HAR1遺伝子の発現分析について.
ハイパーノデュレーション変異体の遺伝子解析.

主要な成果:

HAR1遺伝子は,推定的なセリン/スレオニン受容体キナーゼをコードする.
HAR1は,発射制御による結節数の調節に不可欠です.
HAR1は,共生体の発達における窒素感受性に関与する.

結論:

HAR1は,豆類におけるAON経路の自己調節の重要な構成要素である.
HAR1の機能を理解することで,豆類と微生物の共生と窒素の固定に関する洞察が得られます.
ハル1の窒素感受性における役割は,植物栄養シグナル伝達との統合を強調しています.

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