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 Skelly, Yoshiharu Y Yamamoto, Toshinori Kinoshita, Izumi C. Mori, Takamasa Suzuki, Shigeyuki Betsuyaku, Steven H Spoel, Masatsugu Toyota, Yasuomi Tada

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
Article number1216
Number of pages15
JournalNature Communications
Volume13
Issue number1
DOIs
Publication statusPublished - 8 Mar 2022

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