Autophagy controls reactive oxygen species homeostasis in guard cells that is essential for stomatal opening

Shota Yamauchi, Shoji Mano, Kazusato Oikawa, Kazumi Hikino, Kosuke M. Teshima, Yoshitaka Kimori, Mikio Nishimura, Ken ichiro Shimazaki, Atsushi Takemiya

研究成果: ジャーナルへの寄稿記事

抄録

Reactive oxygen species (ROS) function as key signaling molecules to inhibit stomatal opening and promote stomatal closure in response to diverse environmental stresses. However, how guard cells maintain basal intracellular ROS levels is not yet known. This study aimed to determine the role of autophagy in the maintenance of basal ROS levels in guard cells. We isolated the Arabidopsis autophagy-related 2 (atg2) mutant, which is impaired in stomatal opening in response to light and low CO2 concentrations. Disruption of other autophagy genes, including ATG5, ATG7, ATG10, and ATG12, also caused similar stomatal defects. The atg mutants constitutively accumulated high levels of ROS in guard cells, and antioxidants such as ascorbate and glutathione rescued ROS accumulation and stomatal opening. Furthermore, the atg mutations increased the number and aggregation of peroxisomes in guard cells, and these peroxisomes exhibited reduced activity of the ROS scavenger catalase and elevated hydrogen peroxide (H2O2) as visualized using the peroxisome-targeted H2O2 sensor HyPer. Moreover, such ROS accumulation decreased by the application of 2-hydroxy-3-butynoate, an inhibitor of peroxisomal H2O2-producing glycolate oxidase. Our results showed that autophagy controls guard cell ROS homeostasis by eliminating oxidized peroxisomes, thereby allowing stomatal opening.

元の言語英語
ページ(範囲)19187-19192
ページ数6
ジャーナルProceedings of the National Academy of Sciences of the United States of America
116
発行部数38
DOI
出版物ステータス出版済み - 9 17 2019

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Autophagy
Reactive Oxygen Species
Homeostasis
Peroxisomes
Arabidopsis
Catalase
Hydrogen Peroxide
Glutathione
Antioxidants
Maintenance
Light
Mutation
Genes

All Science Journal Classification (ASJC) codes

  • General

これを引用

Autophagy controls reactive oxygen species homeostasis in guard cells that is essential for stomatal opening. / Yamauchi, Shota; Mano, Shoji; Oikawa, Kazusato; Hikino, Kazumi; Teshima, Kosuke M.; Kimori, Yoshitaka; Nishimura, Mikio; Shimazaki, Ken ichiro; Takemiya, Atsushi.

:: Proceedings of the National Academy of Sciences of the United States of America, 巻 116, 番号 38, 17.09.2019, p. 19187-19192.

研究成果: ジャーナルへの寄稿記事

Yamauchi, Shota ; Mano, Shoji ; Oikawa, Kazusato ; Hikino, Kazumi ; Teshima, Kosuke M. ; Kimori, Yoshitaka ; Nishimura, Mikio ; Shimazaki, Ken ichiro ; Takemiya, Atsushi. / Autophagy controls reactive oxygen species homeostasis in guard cells that is essential for stomatal opening. :: Proceedings of the National Academy of Sciences of the United States of America. 2019 ; 巻 116, 番号 38. pp. 19187-19192.
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abstract = "Reactive oxygen species (ROS) function as key signaling molecules to inhibit stomatal opening and promote stomatal closure in response to diverse environmental stresses. However, how guard cells maintain basal intracellular ROS levels is not yet known. This study aimed to determine the role of autophagy in the maintenance of basal ROS levels in guard cells. We isolated the Arabidopsis autophagy-related 2 (atg2) mutant, which is impaired in stomatal opening in response to light and low CO2 concentrations. Disruption of other autophagy genes, including ATG5, ATG7, ATG10, and ATG12, also caused similar stomatal defects. The atg mutants constitutively accumulated high levels of ROS in guard cells, and antioxidants such as ascorbate and glutathione rescued ROS accumulation and stomatal opening. Furthermore, the atg mutations increased the number and aggregation of peroxisomes in guard cells, and these peroxisomes exhibited reduced activity of the ROS scavenger catalase and elevated hydrogen peroxide (H2O2) as visualized using the peroxisome-targeted H2O2 sensor HyPer. Moreover, such ROS accumulation decreased by the application of 2-hydroxy-3-butynoate, an inhibitor of peroxisomal H2O2-producing glycolate oxidase. Our results showed that autophagy controls guard cell ROS homeostasis by eliminating oxidized peroxisomes, thereby allowing stomatal opening.",
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