关键词: 水稻 株型 产量 相关 通径 选择指数

Abstract:

Twenty five traits associated with straw and leaf and panicle were evaluated, by using F1 and F2 derived from five combinations and their parents. Theresult showed that the yield were positively and significantly at 0.01 or 0.05 level correlated with the plant height, tillers per plant, last second leaf length, flag leaf length and last third leaf opening angle; and the yield were positively and significantly at 0.01 or 0.05 level correlated with the shape of panicle, panicle length, panicle weight, sitting of most second branch, spikelet of first and second branch, 1 000 grain weight, seed settingrate of first and second branch. Plant height, tillers per plant, spikelet of second branch, seed setting rate of first and second branch have exerted direct effect on yield, while the other traits have smaller effects on yield. Constructing a selection index by plant height, tillers per plant, panicle weight, seed setting rate of second branch, the dominant node with the most of second branch, can enhance the selection efficiency to yield.

Key words: rice, plant type, yield, correlation, path coefficient, selection index