Autophagy controls reactive oxygen species homeostasis in guard cells that is essential for stomatal opening
| Autor: | Kosuke M. Teshima, Atsushi Takemiya, Kazusato Oikawa, Ken-ichiro Shimazaki, Shota Yamauchi, Shoji Mano, Kazumi Hikino, Mikio Nishimura, Yoshitaka Kimori |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
0301 basic medicine ATG5 Arabidopsis Autophagy-Related Proteins Aminopeptidases 01 natural sciences ATG12 03 medical and health sciences Stress Physiological Guard cell Autophagy Homeostasis chemistry.chemical_classification Reactive oxygen species Multidisciplinary biology Arabidopsis Proteins Chemistry Biological Sciences Peroxisome Plants Genetically Modified Cell biology 030104 developmental biology Catalase Mutation Plant Stomata biology.protein Reactive Oxygen Species Intracellular Signal Transduction 010606 plant biology & botany |
| Zdroj: | Proceedings of the National Academy of Sciences. 116:19187-19192 |
| ISSN: | 1091-6490 0027-8424 |
| DOI: | 10.1073/pnas.1910886116 |
| Popis: | 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 CO(2) 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 (H(2)O(2)) as visualized using the peroxisome-targeted H(2)O(2) sensor HyPer. Moreover, such ROS accumulation decreased by the application of 2-hydroxy-3-butynoate, an inhibitor of peroxisomal H(2)O(2)-producing glycolate oxidase. Our results showed that autophagy controls guard cell ROS homeostasis by eliminating oxidized peroxisomes, thereby allowing stomatal opening. |
| Databáze: | OpenAIRE |
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