Mechanosensory trichome cells evoke a mechanical stimuli–induced immune response in Arabidopsis thaliana

Mamoru Matsumura, Mika Nomoto (), Tomotaka Itaya, Yuri Aratani, Mizuki Iwamoto, Takakazu Matsuura, Yuki Hayashi, Tsuyoshi Mori, Michael J. Skelly, Yoshiharu Y. Yamamoto, Toshinori Kinoshita, Izumi C. Mori, Takamasa Suzuki, Shigeyuki Betsuyaku, Steven H. Spoel, Masatsugu Toyota and Yasuomi Tada ()
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Mamoru Matsumura: Nagoya University
Mika Nomoto: Nagoya University
Tomotaka Itaya: Nagoya University
Yuri Aratani: Saitama University
Mizuki Iwamoto: University of Tsukuba
Takakazu Matsuura: Okayama University
Yuki Hayashi: Nagoya University
Tsuyoshi Mori: Nagoya University
Michael J. Skelly: University of Edinburgh
Yoshiharu Y. Yamamoto: Gifu University
Toshinori Kinoshita: Nagoya University
Izumi C. Mori: Okayama University
Takamasa Suzuki: Chubu University
Shigeyuki Betsuyaku: University of Tsukuba
Steven H. Spoel: University of Edinburgh
Masatsugu Toyota: Saitama University
Yasuomi Tada: Nagoya University

Nature Communications, 2022, vol. 13, issue 1, 1-15

Abstract: Abstract Perception of pathogen-derived ligands by corresponding host receptors is a pivotal strategy in eukaryotic innate immunity. In plants, this is complemented by circadian anticipation of infection timing, promoting basal resistance even in the absence of pathogen threat. Here, we report that trichomes, hair-like structures on the epidermis, directly sense external mechanical forces, including raindrops, to anticipate pathogen infections in Arabidopsis thaliana. Exposure of leaf surfaces to mechanical stimuli initiates the concentric propagation of intercellular calcium waves away from trichomes to induce defence-related genes. Propagating calcium waves enable effective immunity against pathogenic microbes through the CALMODULIN-BINDING TRANSCRIPTION ACTIVATOR 3 (CAMTA3) and mitogen-activated protein kinases. We propose an early layer of plant immunity in which trichomes function as mechanosensory cells that detect potential risks.

Date: 2022
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DOI: 10.1038/s41467-022-28813-8

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