Improvement of photosynthesis in rice (Oryza sativa L.) as a result of an increase in stomatal aperture and density by exogenous hydrogen sulfide treatment

Hydrogen sulfide (H 2 S) is considered to be the third gaseous signaling molecule after NO and CO, and it plays an active role in regulating the physiological processes of plants and animals. In this work, rice cultivar ‘IIyou 084’ seedlings were treated with NaHS, which is a donor of H 2 S, for 10 ...

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Bibliographic Details
Published in:	Plant growth regulation Vol. 75; no. 1; pp. 33 - 44
Main Authors:	Duan, Bingbing, Ma, Yuehua, Jiang, Mengrou, Yang, Fei, Ni, Lin, Lu, Wei
Format:	Journal Article
Language:	English
Published:	Dordrecht Springer Netherlands 01-01-2015 Springer Nature B.V
Subjects:	Agriculture Biomedical and Life Sciences Carbon dioxide Chlorophyll Cultivars Hydrogen sulfide Life Sciences Original Paper Photochemicals Photosynthesis Physiology Plant Anatomy/Development Plant Physiology Plant Sciences Seedlings Stomata Stomatal conductance Hydrogen sulfide Stomata Oxygen sensitivity Photosynthesis
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Summary:	Hydrogen sulfide (H 2 S) is considered to be the third gaseous signaling molecule after NO and CO, and it plays an active role in regulating the physiological processes of plants and animals. In this work, rice cultivar ‘IIyou 084’ seedlings were treated with NaHS, which is a donor of H 2 S, for 10 days, and its effects on growth and physiology, including photosynthesis, photorespiration, chlorophyll fluorescence, and stomata, were investigated. The data revealed that 0.01 mM of H 2 S improved rice biomass and chlorophyll content, while higher concentrations of H 2 S had an adverse effect on these parameters. Photosynthetic rate, stomatal conductance, and ribulose-1,5-bisphosphate carboxylase (EC 4.1.1.39) activity also increased under 0.01 mM H 2 S treatment. However, photosynthetic oxygen evolution rate, photosynthetic electron transfer, and photochemical efficiency of PSII were not affected by H 2 S treatment. In addition, photosynthesis oxygen sensitivity, CO 2 compensation point, and glycolate oxidase (EC 1.1.3.1) activity reduced by H 2 S treatment, and thus photorespiration was down-regulated. Under light, stomatal aperture and density increased by treatment with 0.01 mM H 2 S. On the basis of these results, it can be deduced that 0.01 mM of H 2 S treatment improved photosynthesis in rice by increasing its stomatal aperture and density, which may result from reduced photorespiration.
ISSN:	0167-6903 1573-5087
DOI:	10.1007/s10725-014-9929-5