Rice tillering and plant height dynamic responses to drought and flood alternating stress
ZHANG Yidi, YU Shuang′en, GAO Shikai, WANG Mei,WANG Jiao, LI Si
1.Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China, Ministry of Education, Hohai University, Nanjing, Jiangsu 210098, China; 2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China
Abstract：In practice of rice production, rice plants are often in drought and flood alternating stress. In order to understand rice tillering and plant growing dynamics under drought and flood alternating stress, the influence of drought and flood alternating stress on number of tillering and plant height was studied by using pit test. Then, a dynamic model for number of tillering was used to fit the change of tiller, and a Logistic growth model was applied to fit the dynamic change of plant height. Results showed that the drought and flood alternating stress could inhibit rice tillering in different degrees in tillering, jointing booting, and flowering stages. Specially, flood could promote, but drought could suppress rice plant height to grow in tillering, jointing booting, and flowering stages. The dynamic model could fit the number of tillers well and had practical significance. The Logistic model could fit the dynamic height better and was feasible. The results in the paper can provide an effective and scientific basis for proposing rational irrigation schemes and improving rice yield.
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