亚种间杂交稻的源库关系的研究

比较了亚种间杂交稻与汕优６３的源库关系差异，分析了源库关系对结实率的影响。结果表明：（１）亚种间杂交稻较汕优６３的库容量大，抽穗期单位叶面积负担的库容量多；（２）亚种间杂交稻的单位面积上的有效穗数较汕优６３少，但每穗粒数多、且分布在二次枝梗上的籽粒的比例大；抽穗期上部３片叶的面积总叶面积的比例小；（３）剪叶和疏花对结实率的影响亚种间杂交稻较汕优６３大。

STUDY ON THE RELATIONSHIP OF THE SOURCE-SINK IN THE INIERSUBSPECIFIC HYBRID RICE

This paper compares the relationship of source-sink in the intersubspecific hybrid ricewith that in the Shanyou 63(intervarietal hybrid rice),and analyses the effect of the relation-ship of the source-sink on the seed setting rate.The experimental results showed that:(1)The intersubspecific hybrid rice,compared with Shanyou 63, had greater sink capacity, and itsunit leaf area burdened more sink capacity at heading.(2)The intersubspecific hybrid rice,compared with Shanyou 63,had smaller number of panicles/unit area,but larger number ofgrains per panicle,and higher proportion of grains distributed on the secondary branch.Theproportion of the three topic leaves' area to the total leaf area in the intersubspecific hybrid ricewas lower than that in Shanyou 63 at heading.(3)The effect of cutting off leaves spikelets onseed setting rate in the intersubspecific hybrid rice was greater than that in Shanyou 63.