Companion cell mediates wound- stimulated leaf- to- leaf electrical signaling

文献类型： 外文期刊

第一作者： Wu, Qian

作者： Wu, Qian;Li, Yangyang;Kong, Xiaohang;Li, Yangyang;Li, Yangyang;Chen, Mengjiao

作者机构：

关键词： electrical signaling; glutamate receptor; phloem; plant defense; wound

期刊名称：PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA （ 影响因子：9.4； 五年影响因子：10.8 ）

ISSN： 0027-8424

年卷期： 2024 年 121 卷 24 期

页码：

收录情况： SCI

摘要： Leaf wounding triggers rapid long- range electrical signaling that initiates systemic defense responses to protect the plants from further attack. In Arabidopsis, this process largely depends on clade three GLUTAMATE RECEPTOR- LIKE (GLR) genes GLR3.3 and GLR3.6. In the cellular context, phloem sieve elements and xylem contact cells where GLRs were mostly present are implicated in the signaling events. In spite of that, the spatial requirements of different leaf cell types for leaf- to- leaf signaling remain poorly investigated. In this study, we dissected cell- type- specific long- distance wound signaling mediated by GLR3s and showed that phloem companion cells are critical in shaping the functions of GLR3.3 and GLR3.6 in the signaling pathway. GLR3.3- mediated response is phloem- specific, during which, GLR3.3 has to be renewed from companion cells to allow its function in sieve elements. GLR3.6 functions dually in ectopic phloem companion cells, in addition to xylem contact cells. Furthermore, the action of GLR3.6 in phloem is independent of its paralog GLR3.3 and probably requires synthesis of GLR3.6 from xylem contact cells. Overall, our work highlights that the phloem companion cell is crucial for both GLRs in controlling leaf- to- leaf electrical signaling.

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