著者の所属・活動拠点の国は、中国です。

掲載誌：中国科学通报：英文版

ライセンス: CC BY　対象: 公開論文　確認元: OpenAlex

研究の目的

研究チームは、トウモロコシが塩やアルカリによるストレスに応答する分子の仕組みを調べました。土壌の塩類化とアルカリ化は作物の生産を制約しますが、植物がこれらに適応する仕組みには未解明の部分があります。この研究では、ストレスに応答する遺伝子ZmGPAT6に着目しました。

何を、どのように調べたか

研究チームは、トウモロコシの葉と根を対象に、塩ストレスとアルカリストレスのもとでのZmGPAT6の働きを調べました。この遺伝子がつくる酵素による脂質の変化と、ZmMPK2、ZmMPK7というタンパク質、さらに膜を通して物質を運ぶアクアポリンZmPIP2;1との関係を検討しました。特に、タンパク質へのリン酸基の付加・除去という調節と、活性酸素の一種である過酸化水素の輸送とのつながりを調べました。

主な報告結果

著者らは、ZmGPAT6が二つの経路で過酸化水素の輸送を抑えると報告しました。一つは脂質を介する経路です。ZmGPAT6はリゾホスファチジン酸とモノアシルグリセロールの生成を触媒し、ホスファチジン酸を減少させました。ホスファチジン酸は、本来、ZmMPK2とZmMPK7を活性化し、これらがZmPIP2;1にリン酸基を付けることで過酸化水素の輸送を促します。もう一つは、ZmGPAT6がZmMPK2、ZmMPK7、ZmPIP2;1に直接作用し、リン酸基を取り除く経路です。塩とアルカリのどちらのストレスでもZmGPAT6の発現が誘導され、両経路を通じて輸送が抑えられました。その結果、葉と根に過酸化水素が過剰に蓄積し、トウモロコシの生育が損なわれたとしています。

この報告が示すこと

研究チームは、脂質の代謝と、タンパク質へのリン酸基の付加による調節が、過酸化水素の輸送を介して直接つながる仕組みを示したと結論づけています。この仕組みに関わる遺伝子を、トウモロコシの塩・アルカリ耐性の改良に向けた潜在的な標的として位置づけています。

原著論文の著者・所属：Xiaocong Cao（Beijing Key Laboratory of Maize Bio-breeding, Research Institute of Biology and Agriculture, School of Advanced Agricultural Sciences, University of Science and Technology Beijing, Beijing 100083, China）、Yurong Xie（Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding, Beijing International Science and Technology Cooperation Base of Bio-Tech Breeding, Zhongzhi International Institute of Agricultural Biosciences, Beijing 100083, China; Beijing Key Laboratory of Maize Bio-breeding, Research Institute of Biology and Agriculture, School of Advanced Agricultural Sciences, University of Science and Technology Beijing, Beijing 100083, China）、Juan Zhang（Beijing Key Laboratory of Maize Bio-breeding, Research Institute of Biology and Agriculture, School of Advanced Agricultural Sciences, University of Science and Technology Beijing, Beijing 100083, China）、Lina Zhao（Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding, Beijing International Science and Technology Cooperation Base of Bio-Tech Breeding, Zhongzhi International Institute of Agricultural Biosciences, Beijing 100083, China; Beijing Key Laboratory of Maize Bio-breeding, Research Institute of Biology and Agriculture, School of Advanced Agricultural Sciences, University of Science and Technology Beijing, Beijing 100083, China）、Ziwei Chu（Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding, Beijing International Science and Technology Cooperation Base of Bio-Tech Breeding, Zhongzhi International Institute of Agricultural Biosciences, Beijing 100083, China; Beijing Key Laboratory of Maize Bio-breeding, Research Institute of Biology and Agriculture, School of Advanced Agricultural Sciences, University of Science and Technology Beijing, Beijing 100083, China）、Panqi Qiu（Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding, Beijing International Science and Technology Cooperation Base of Bio-Tech Breeding, Zhongzhi International Institute of Agricultural Biosciences, Beijing 100083, China; Beijing Key Laboratory of Maize Bio-breeding, Research Institute of Biology and Agriculture, School of Advanced Agricultural Sciences, University of Science and Technology Beijing, Beijing 100083, China）、Wenhua Li（Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding, Beijing International Science and Technology Cooperation Base of Bio-Tech Breeding, Zhongzhi International Institute of Agricultural Biosciences, Beijing 100083, China; Beijing Key Laboratory of Maize Bio-breeding, Research Institute of Biology and Agriculture, School of Advanced Agricultural Sciences, University of Science and Technology Beijing, Beijing 100083, China）、Yuxi Zheng（Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding, Beijing International Science and Technology Cooperation Base of Bio-Tech Breeding, Zhongzhi International Institute of Agricultural Biosciences, Beijing 100083, China; Beijing Key Laboratory of Maize Bio-breeding, Research Institute of Biology and Agriculture, School of Advanced Agricultural Sciences, University of Science and Technology Beijing, Beijing 100083, China）、Jiapeng Xing（Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding, Beijing International Science and Technology Cooperation Base of Bio-Tech Breeding, Zhongzhi International Institute of Agricultural Biosciences, Beijing 100083, China; Beijing Key Laboratory of Maize Bio-breeding, Research Institute of Biology and Agriculture, School of Advanced Agricultural Sciences, University of Science and Technology Beijing, Beijing 100083, China）、Suowei Wu（Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding, Beijing International Science and Technology Cooperation Base of Bio-Tech Breeding, Zhongzhi International Institute of Agricultural Biosciences, Beijing 100083, China; Beijing Key Laboratory of Maize Bio-breeding, Research Institute of Biology and Agriculture, School of Advanced Agricultural Sciences, University of Science and Technology Beijing, Beijing 100083, China）、Xun Wei（Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding, Beijing International Science and Technology Cooperation Base of Bio-Tech Breeding, Zhongzhi International Institute of Agricultural Biosciences, Beijing 100083, China; Beijing Key Laboratory of Maize Bio-breeding, Research Institute of Biology and Agriculture, School of Advanced Agricultural Sciences, University of Science and Technology Beijing, Beijing 100083, China）、Yan Long（Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding, Beijing International Science and Technology Cooperation Base of Bio-Tech Breeding, Zhongzhi International Institute of Agricultural Biosciences, Beijing 100083, China; Beijing Key Laboratory of Maize Bio-breeding, Research Institute of Biology and Agriculture, School of Advanced Agricultural Sciences, University of Science and Technology Beijing, Beijing 100083, China）、Xueli An（Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding, Beijing International Science and Technology Cooperation Base of Bio-Tech Breeding, Zhongzhi International Institute of Agricultural Biosciences, Beijing 100083, China; Beijing Key Laboratory of Maize Bio-breeding, Research Institute of Biology and Agriculture, School of Advanced Agricultural Sciences, University of Science and Technology Beijing, Beijing 100083, China）、Caifu Jiang（State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100083, China）、Xiangyuan Wan（Beijing Engineering Laboratory of Main Crop Bio-Tech Breeding, Beijing International Science and Technology Cooperation Base of Bio-Tech Breeding, Zhongzhi International Institute of Agricultural Biosciences, Beijing 100083, China; Beijing Key Laboratory of Maize Bio-breeding, Research Institute of Biology and Agriculture, School of Advanced Agricultural Sciences, University of Science and Technology Beijing, Beijing 100083, China）

※本記事は原著論文をもとに、日本語で要約・説明を加えた研究紹介です。 出典（原著論文）：Xiaocong Cao, Yurong Xie, Juan Zhang, et al. The ZmGPAT6–ZmMPK2/7–ZmPIP2;1 fine-regulated module confers salt-alkali tolerance via controlling H2O2 transport in maize. 中国科学通报：英文版 2026-11-01. DOI: 10.1016/j.scib.2026.11.004. 原著ライセンス：CC BY.