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| DOI： |
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| Impact of Alternating Drought and Waterlogging during Tillering Stage on Physiological Traits of Rice |
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ZHEN Bo, GUO Xiangping, LU Hongfei, ZHOU Xinguo, WANG Zhenchang, LI Xiaopu
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Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
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| Abstract: |
| This paper investigated the impact of alternating waterlogging and drought during the tillering stage on physiological traits of rice using pot experiments. We considered both slight waterlogging-drought alternation (T-LD) and severe waterlogging-drought alternation (T-HD). Main physiological traits were measured before, during and after occurrence of these stresses. The results showed that the activity of nitrate reductase in the leaves under T-LD was higher than those under T-HD and CK (conventional flooding). In comparison with those under CK, the concentration of malondialdehyde and the activity of glutamine synthetase (GS) under T-LD and T-HD decreased significantly, while the concentration of chlorophyll increased. At ripening stage after re-watering, the activity of GS increased considerably and was higher than that under the CK, indicating that a moderate waterlogging-drought alternation during tillering stage can enhance physiological activity of the rice and delayed senescence without scarifying tolerance of the rice to flooding. |
| Key words: alternative drought and waterlogging; rice; tillering stage; physiological traits; submergence tolerance |
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