水稻叶基角优化的虚拟试验研究

Study on the leaf base angle optimization of rice by virtual experiment

根据超级稻沈农265的田间试验数据,应用水稻株型设计系统进行冠层结构三维建模,采用二次回归旋转组合进行叶基角设计,将不同叶基角组合赋予沈农265模型构建虚拟群体,并分别进行了光分布虚拟实验,结合理论穗重模型分析了叶基角对产量的影响。结果表明:在50°～90°范围内,沈农265上部5片叶的叶基角最优值由上至下依次为90.0°、50.0°、66.7°、50.0°和50.0°,优化群体理论穗重高于对照9.85%。说明剑叶直立,倒二叶、倒三叶等中下部叶片适度平展有利于通过提高中下部叶片光合干物质积累对穗重的贡献率而增加产量。其中,倒二叶的叶基角改良最为重要。

On the basis of field experiment data,in use of Rice Plant Type Design System,3-dimentional model was constructed for super high yield rice variety Shennong 265.According to quadratic regression rotational combinational design,virtual population of Shennong 265 was reconstructed with different leaf base angle,and was used to carry out virtual experiment on light distribution.Combined with theoretical panicle weight model,analysis was made on the relationship between leaf base angle and final yield.The result shows that：optimized leaf base angle from top down are 90.0°,50.0°,66.7°,50.0° and 50.0°.Cooresponding theoretical panicle weight is 3.63 g,9.85% more than the control.So,combination of erect flagleaf and moderately flatend middle-lower leaf,such as secondary and third leaf,is good for the contribuiton ratio of leaf dry matter accumulation to panicle,and good for the improvement of yield level.The optimizaiton of secondary leaf base angle seems crucially important.