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| Regulation of exogenous calcium on plasma membrane compositions and calcium forms of rice roots under simulated acid rain stress |
| Received:December 16, 2020 |
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| KeyWord:exogenous calcium;acid rain;rice;plasma membrane compositions;calcium forms |
| Author Name | Affiliation | E-mail | | MA Yong-jia | Jiangsu Province Key Laboratory of Anaerobic Biological Technology, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
Jiangsu Cooperative Innovation Center of Technology and Material of Water Treatment, Wuxi 214122, China | | | LIANG Chan-juan | Jiangsu Province Key Laboratory of Anaerobic Biological Technology, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
Jiangsu Cooperative Innovation Center of Technology and Material of Water Treatment, Wuxi 214122, China | liangchanjuan@jiangnan.edu.cn |
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| Abstract: |
| To explore effective ways to reduce damage on plants caused by acid rain, the effect of exogenous calcium（Ca, 5 μmol·L-1）on the membrane stability, plasma membrane compositions, and calcium forms in rice roots under simulated acid rain（SAR, pH 4.5/3.0）were studied through hydroponic experiments. Low intensity SAR（pH 4.5）had no significant effect on membrane stability in rice roots. High intensity SAR（pH 3.0）decreased the membrane stability, contents of phospholipids（phosphatidylcholine and phosphatidylglycerol）, and membrane protein in rice roots and increased the content of water-soluble calcium. After a 5-day recovery, the above indicators in rice roots treated with pH 3.0 SAR were still lower than the control. Compared with rice treated with single SAR or Ca2+, pH 4.5+Ca2+ treatment had no effect on the membrane stability in rice roots. pH3.0+Ca2+ decreased the membrane stability as well as the contents of phospholipids, membrane proteins, and non-water-soluble calcium in rice roots, and these parameters were higher than those treated with pH 3.0 SAR. Water-soluble calcium in rice roots treated with pH 3.0 + Ca2+ was increased and lower than the pH 3.0 SAR treatment. After a 5-day recovery, the above indicators in rice roots treated with pH 3.0+Ca2+ were close to the control. Briefly, exogenous Ca2+ enhance the tolerance of rice to SAR stress and that is related to maintaining the balance of water-soluble calcium and non-water-soluble calcium as well as alleviating the degradation of phospholipids and membrane proteins. The alleviating effect is limited by the intensity of acid rain. |
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