| This article has been：Browse 1820Times Download 2636Times |
scan it! |
|
|
| DOI：10.13522/j.ggps.cnki.20180323 |
|
| The Effects of Alternate Hot Wave and Waterlogging on Physiological Traits of Rice at Booting Stage |
|
ZHEN Bo, ZHOU Xinguo, LU Hongfei, LI Huizhen
|
|
1.Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; 2.National Research and Observation Station of Shangqiu Agro-ecology System, Shangqiu 476000, China
|
| Abstract: |
| 【Objective】 Rice in southern Huanghuai Plain of China is susceptible to high temperature and waterlogging stress. This paper presents results of an experimental study on response of physiological traits of rice to alternate high temperature and waterlogging in attempts to improve rainwater use and reduce non-point source pollution.【Method】Rice was planted in pots and we investigated five treatments: high temperature (T1), high temperature coupled with light waterlogging (T2), high temperature coupled with heavy waterlogging (T3), light waterlogging (T4) and heavy waterlogging (T5). The control (CK) was conventional irrigation. For each treatment, we measured the chlorophyll, soluble sugars, soluble proteins and antioxidant enzyme in the flag leaves at booting stage, from which we analyzed the effects of alternate high-temperature and waterlogging on physiological indices of the flag leaf. 【Result】① Alternate occurrence of high temperature and waterlogging at the booting stage reduced the chlorophyll content in the flag leaf. Compared to CK, T2 and T3 reduced the chlorophyll content by 17.27% and 19.54% respectively. However, after recovering from the stresses, T2 saw a certain compensation and the chlorophyll content in its flag leaf increased consequently by 12.22% compared to the CK. ②The soluble sugar content in the flag leaf increased first followed by a decline after occurrence of high temperature and waterlogging at the booting stage, especially in T2 which was 12.36% higher than that in CK. After recovering for 20 days, the soluble sugar content in T2 was 33.33% lower than that in CK (P<0.05). ③High temperature and waterlogging at the booting stage enhanced the activities of SOD, POD and CAT in the flag leaf, and at the end of the stresses, the activities of SOD, POD and CAT in T2 increased by 102.08%, 43.42% and 39.80%, respectively, compared to those in the CK. 【Conclusion】Alternate high temperature and waterlogging at the booting stage reduced the chlorophyll content in the flag leaf but enhanced the activity of antioxidant enzymes. The effect of alternate high temperature and waterlogging is less detrimental than that caused by high temperature alone, but more damaging than that induced by waterlogging alone. |
| Key words: interaction; chlorophyll; soluble sugars; soluble proteins, antioxidant enzyme; rice |
|
|
