| Physiological Indices and Selection of Methods on Rapid Identification for Sweet Potato Drought Resistance |
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| 作者姓名： | ZHANG Ming-sheng TAN Feng ZHANG Qi-tang YANG Yong-hua |
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| 作者单位： | [1]School of Life Sciences, Nanjing University, Nanjing 210093, P.R.China [2]School of Agronomy, Guizhou University, Guiyang 550025, P.R.China [3]School of Life Sciences, Southwest China Normal University, Chongqing 400715, P.R.China |
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| 基金项目： | The project was supported by the Key Project of the Science and Technology in the Nation＇s 9th Five-Year Plan of China （96-002-02-17）. |
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| 摘 要： | The relationships between the changes of relative water content （RWC）, malondialdehyde （MDA） contents, superoxide dismutase （SOD） activity and free proline contents in sweet potato leaves, and drought resistant ability under different concentration of polyethylene glycol （PEG） treatment applied at rhizosphere of sweet potato seedlings were studied. A highly positive correlation between RWC and drought resistance （r =0.783, P〈0.01）, a highly negative correlation between MDA contents and drought resistance （r = -0.848, P〈0.01）, a highly positive correlation between SOD activity and drought resistance （r = 0.777, P〈0.01） was observed. Free proline contents in leaves was not related obviously to the sweet potato drought resistance under 25% PEG treatment. The stronger the drought resistance of variety, the less decrease of RWC and increase of MDA contents, the more increase of SOD activity. By determining these physiological indices in sweet potato leaves under 25% PEG treatment, rapid identification of drought resistant ability of different varieties can be obtained in the lab.
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| 关 键 词： | 土豆 抗旱性 生理性状 选择性 岐化酶 |
Physiological Indices and Selection of Methods on Rapid Identification for Sweet Potato Drought Resistance |
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| ZHANG Ming-sheng TAN Feng ZHANG Qi-tang YANG Yong-hua.Physiological Indices and Selection of Methods on Rapid Identification for Sweet Potato Drought Resistance[J].Agricultural Sciences in China,2005,4(11):826-832. |
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| Authors: | ZHANG Ming-sheng TAN Feng ZHANG Qi-tang YANG Yong-hua |
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| Abstract: | The relationships between the changes of relative water content (RWC), malondialdehyde (MDA) contents, superoxide dismutase (SOD) activity and free proline contents in sweet potato leaves, and drought resistant ability under different concentration of polyethylene glycol (PEG) treatment applied at rhizosphere of sweet potato seedlings were studied. A highly positive correlation between RWC and drought resistance (r =0.783, P＜0.01), a highly negative correlation between MDA contents and drought resistance (r = -0.848, P＜0.01), a highly positive correlation between SOD activity and drought resistance (r = 0.777, P＜0.01) was observed. Free proline contents in leaves was not related obviously to the sweet potato drought resistance under 25% PEG treatment. The stronger the drought resistance of variety, the less decrease of RWC and increase of MDA contents, the more increase of SOD activity. By determining these physiological indices in sweet potato leaves under 25% PEG treatment, rapid identification of drought resistant ability of different varietiescan be obtained in the lab. |
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| Keywords: | Sweet potato Drought resistance Water stress Physiological indices Drought-resistance coefficient |
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