不同粳稻品种源库关系的研究 Ⅳ.不同源库特性品种齐穗期适宜LAI单位面积最适颖花量及产量的比较

THE RELATIONSHIP BETWEEN SOURCE AND SINK IN DIFFERENT JAPONICA RICE VARIETIES——Ⅳ. THE COMPARISON BETWEEN OPTIMUM LAI, NUMBER OF FLOWERS AND YIELD IN DIFFERENT SOURCE AND SINK CHARACTERISTIC VARIETIES AT NEAT-EAR DATE

摘要:

对不同源库特性水稻品种齐穗期LAI,单位面积颖花量的研究结果表明,品种单位面积实粒数与齐穗期LAI,单位面积颖花量的关系均为抛物线方程:y=ax+bx²。抛物线的顶点即品种的最适颖花量和齐穗期最适LAI有明显差异,其中秀杂单位面积最适颖花量和齐穗期适宜LAI均较高,而其它品种不是两者均低就是两者不平衡,因而产量受到影响。从库（颖花）效率来看,在氮肥增加时,秋光和秀杂的库效率高,其余几个品种的库效率都明显较低。由此可见,在高产育种上,应注意选拔单位面积最适颖花量和齐穗期最适LAI及库效率均高的优良材料。

Abstract:

The LAI of rice varieties with different source and sink characteristics and the number of flowers per unit area were studied. The results showed that: The relation of the real number of grains in a variety with both neat-ear-date LAI and the number of flowers per unit area tended to be a parabola aquation:y=ax+bx~2. The peak point of parabola was the varietal optimum number of flowers or the optimum LAI at the neat-ear-date. The optimun number of flowers of the optimum LAI were varied with varieties at neat-ear-date. Both optimum number of flowers per unit area and LAI at neat-ear-date for variety, Xiuza were high, and for other varieties either low or unbalanced. When the amount of N fertilizition was imcreased, the rate of the number of effective flowers in Qiaguang and Xiuza was high, and the rest varieties were all obviously low in the rate of the number of effective flowers. Thus it should be paid attention to choose the lines that optimum number of flowers per unit area, optimun LAI at neat-ear-date and the rate of the number of flowers are all high in high yield breading program.