Abstract
Arabidopsis thaliana dynamin-like protein 1E (ADL1E) is known to regulate mitochondrial elongation. The adl1e mutant has no morphological phenotype, and the growth and photosynthetic activity of the mutant are similar to those of the wild type. Leaf O2 uptake, which is supported by mitochondrial activity in the dark, is increased 1.7-fold by mutation in adl1e gene. The ATP content in the dark of guard and mesophyll cell protoplasts (GCPs and MCPs, respectively) was 2.5- to 4-fold higher in GCPs of the mutant and the wild type, and increased upon the addition of glucose in both genotypes. Oligomycin, an inhibitor of mitochondrial ATPase, suppressed ATP synthesis in both GCPs and MCPS isolated from adl1e plants, indicating that mutant had higher mitochondrial activity. The stomatal apertures of mutant and wild-type plants were then analyzed in vitro. In the light, the stomata of both genotypes showed similar patterns of opening. However, in the dark response, the stomata of the adl1e mutant closed faster than did those of the wild type. Oligomycin severely inhibited dark-induced stomatal closure in both cell types. The results suggest that stomatal closure in the dark is governed by cytosolic ATP concentration, which is stimulated by mitochondrial activity.
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Acknowledgments
This work was supported by a grant (Code #0050401-034-677140-03-00) to C.-H.G. from BioGreen 21 program, Rural Development Administration, Republic of Korea and, in part, by a grant from Priority Research Centers Program through the National Research Foundation (NRF) funded by the Ministry of Education, Science and Technology (2010-0029630).
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Chang-Hyo Goh and Suk-Min Ko contributed equally to this work.
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Goh, CH., Ko, SM., Park, YI. et al. Regulation of Dark-Induced Stomatal Closure in Arabidopsis Dynamin-Like Protein 1E (adl1e) Mutant Leaves. J. Plant Biol. 54, 112–118 (2011). https://doi.org/10.1007/s12374-011-9149-8
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DOI: https://doi.org/10.1007/s12374-011-9149-8