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Title: Epidermal chloroplasts are defense-related motile organelles equipped with plant immune components
Authors: Irieda, Hiroki
Takano, Yoshitaka  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-1427-1322 (unconfirmed)
Author's alias: 入枝, 泰樹
高野, 義孝
Keywords: Biotic
Chloroplasts
Microbe
Issue Date: 2021
Publisher: Springer Nature
Journal title: Nature Communications
Volume: 12
Thesis number: 2739
Abstract: In addition to conspicuous large mesophyll chloroplasts, where most photosynthesis occurs, small epidermal chloroplasts have also been observed in plant leaves. However, the functional significance of this small organelle remains unclear. Here, we present evidence that Arabidopsis epidermal chloroplasts control the entry of fungal pathogens. In entry trials, specialized fungal cells called appressoria triggered dynamic movement of epidermal chloroplasts. This movement is controlled by common regulators of mesophyll chloroplast photorelocation movement, designated as the epidermal chloroplast response (ECR). The ECR occurs when the PEN2 myrosinase-related higher-layer antifungal system becomes ineffective, and blockage of the distinct steps of the ECR commonly decreases preinvasive nonhost resistance against fungi. Furthermore, immune components were preferentially localized to epidermal chloroplasts, contributing to antifungal nonhost resistance in the pen2 background. Our findings reveal that atypical small chloroplasts act as defense-related motile organelles by specifically positioning immune components in the plant epidermis, which is the first site of contact between the plant and pathogens. Thus, this work deepens our understanding of the functions of epidermal chloroplasts.
Description: 植物の表皮細胞に存在する機能未知の小さな葉緑体の存在意義を解明 --表皮葉緑体は免疫因子を搭載して細胞内を移動し病原菌の侵入阻止に関与する--. 京都大学プレスリリース. 2021-05-21.
Rights: © The Author(s) 2021
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.
URI: http://hdl.handle.net/2433/262988
DOI(Published Version): 10.1038/s41467-021-22977-5
PubMed ID: 34016974
Related Link: https://www.kyoto-u.ac.jp/ja/research-news/2021-05-21-2
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