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| Hydrogen sulfide regulates the photosynthetic physiology of Brassica pekinensis (Lour.) Rupr. under cadmium stress |
| Received:November 10, 2018 |
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| KeyWord:Chinese cabbage;hydrogen sulfide;photosynthesis;cadmium |
| Author Name | Affiliation | E-mail | | CHE Tao | School of Life Science, Shanxi University, Taiyuan 030006, China
Key Laboratory for Research and Development of Regional Plants, Taiyuan 030006, China | | | ZHANG Li-ping | School of Life Science, Shanxi University, Taiyuan 030006, China
Key Laboratory for Research and Development of Regional Plants, Taiyuan 030006, China | | | JIN Zhu-ping | School of Life Science, Shanxi University, Taiyuan 030006, China
Key Laboratory for Research and Development of Regional Plants, Taiyuan 030006, China | | | PEI Yan-xi | School of Life Science, Shanxi University, Taiyuan 030006, China
Key Laboratory for Research and Development of Regional Plants, Taiyuan 030006, China | peiyanxi@sxu.edu.cn |
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| Abstract: |
| To study the function of hydrogen sulfide (H2S) on the photosynthetic physiology of Chinese cabbage[Brassica pekinensis (Lour.) Rupr.] seedlings under cadmium (Cd) stress, we examined the effects of Cd stress and H2S on photosynthetic characteristics, ribulose-1,5-hisphpsphate (Rubp) carboxylase activity, and the expression level of RBCSes (small subunits of Rubp) using physiological, biochemical, and real-time quantitative PCR analyses. Seedling growth, chlorophyll content, photosynthetic fluorescence parameters (e.g., Fv/F0, Fv/Fm, and PIabs), and net photosynthetic rate (Pn) were inhibited considerably under 5 mmol·L-1 Cd stress, whereas 5 μmol·L-1 NaHS pretreatment alleviated the effects of Cd stress physiologically and up-regulated the mRNA levels of RBCSes under Cd stress. H2S promoted the activity of seedling Rubp carboxylase without Cd stress. In contrast, the presence of 0.1 mmol·L-1 hypotaurine (H2S scavenger) aggravated the inhibition effects of Cd stress on the seedlings. Thus, H2S enhanced the photosynthesis of seedlings to alleviate the damage caused by Cd stress and to maintain the growth of Chinese cabbage under Cd stress. |
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