| Physiological response and drought resistance evaluation of different soybean varieties to drought stress at germination stage |
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| DOI：10.7606/j.issn.1000-7601.2018.02.20 |
| Key Words: soybean germination stage physiological characteristics membership function method |
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| Abstract: |
| In our present study, the drought resistance of three soybean varieties which were Huangdou, Jindou 19 and Zheng 9007 were studied in different concentrations (0, 12%, 14%, 16%, 18% and 20%) of PEG-6000. The germination indices, changes of physiological and biochemical indices were studied under both normal water supply and simulated drought conditions. The results showed that PEG-6000 treatment reduced the relative germination potential, relative germination rate and relative radicle length of three soybean varieties, and 18% PEG-6000 was the suitable drought stress condition for drought resistance evaluation. The activity of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), the content of soluble sugar content, soluble protein content, proline content and malondialdehyde (MDA) in three cultivars were significantly changed under 18% PEG-6000 treatment. The SOD activity, POD activity, CAT activity, soluble sugar content, soluble protein content and proline content in radicle of Huangdou were 5.41, 2.13, 2.64, 2.84, 2.13 and 10.98 times higher than that of the control, respectively, which were higher than that of Jinzou 19 and Zheng 9007, however, the MDA content in radicle of Huangdou were 1.59 times higher than that of control, which was lower than Jindou 19 and Zheng 9007. The results of membership function analysis showed that the rank of drought resistance of three soybean varieties was Soybean＞Zheng 9007＞Jindou 19, which indicated that Huangdou has higher drought resistance ability than that of Jindou 19 and Zheng 9007. |
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