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Role of mitochondria and chloroplasts during stomatal closure: Subcellular location of superoxide and H2O2 production in guard cells of Arabidopsis thaliana

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Stomatal guard cells are unique in that they have more mitochondria than chloroplasts. Several reports emphasized the importance of mitochondria as the major energy source during stomatal opening. We re-examined their role during stomatal closure. The marked sensitivity of stomata to both menadione (MD) and methyl viologen (MV) demonstrated that both mitochondria and chloroplasts helped to promote stomatal closure in Arabidopsis. As in the case of abscisic acid (ABA), a plant stress hormone, MD and MV induced stomatal closure at micromolar concentration. All three compounds generated superoxide and H2O2, as indicated by fluorescence probes, BES-So-AM and CM-H2DCFDA, respectively. Results from tiron (a superoxide scavenger) and catalase (an H2O2 scavenger) confirmed that both the superoxide and H2O2 were requisites for stomatal closure. Co-localization of the superoxide and H2O2 in mitochondria and chloroplasts using fluorescent probes revealed that exposure to MV initially triggered higher superoxide and H2O2 generation in mitochondria. In contrast, MD elevated superoxide/H2O2 levels in chloroplasts. However, with prolonged exposure, MD and MV induced ROS production in other organelles. We conclude that ROS production in mitochondria and chloroplasts leads to stomatal closure. We propose that stomatal guard cells can be good models for examining inter-organellar interactions.

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Acknowledgements

Our work was supported by research grants to ASR from the Institute of Eminence (IoE) Chair Professor and partly from DBT-SAHAJ/BUILDER (BT/INF/22/SP41176/2020). SG holds a Senior Research Fellowship from the University Grants Commission. PB was a BBL fellowship holder from our University. DS is an IoE-post doctoral fellow at our University. We appreciate the help of Mr. Dashrath in confocal microscopy.

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ASR designed the work. SG, PB, and DS performed the experiments. ASR and GP supervised the experiments and analyzed the results. SG and ASR wrote the first draft. All the authors read and finalized the manuscript.

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Correspondence to Agepati S Raghavendra.

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Corresponding editor: Manoj Prasad

This article is part of the Topical Collection: Plant Mitochondria: Properties and Interactions with Other Organelles.

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Gahir, S., Bharath, P., Saini, D. et al. Role of mitochondria and chloroplasts during stomatal closure: Subcellular location of superoxide and H2O2 production in guard cells of Arabidopsis thaliana. J Biosci 49, 44 (2024). https://doi.org/10.1007/s12038-023-00418-3

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