水稻穗部性状特点初步分析

A Preliminary Analysis of Characters of Rice Panicles

分析一次枝梗数相同的8个品种穗部性状的结果表明 :单株产量、穗数与穗粒重三者构成闭合回路 ,通过次枝梗总长、穗长与产量三因素相联系 ;一次枝梗粒数、秕粒数及粒重在穗轴各节位的分布均匀 ,品种间差异不明显 ,一次枝梗长在穗轴上的分布可分为中下位优势型、中位优势型和中上位优势型 ;二次枝梗个数与粒数在穗轴上呈梭型分布 ,最大值出现在中部及中下部节位 ,穗轴不同节位二次枝梗结实率上部>中部>下部。

The panicle characters of 8 rice varieties which have same primary branches were analyzed. The results are as follows: A close loop of grain yield per plant, panicle number per plant and grain weight per panicle was formed and the three yield components were correlated by way of total length of primary branches and panicle length. The distributions of grain number on primary branches, unfilled spikelets and grain weights were uniform at all nodal points of panicle axis and the differences of distributions were not distinct among the varieties. The superior part of distribution of the primary branch length were divided into three types: middle-lower panicle, middle panicle and middle-upper panicle. The numbers of secondary branches and grains showed that the distributions were like shuttles and their maximum values occured on middle or middle-low part of the panicles. The seed setting rate of secondary branches of upper panicles was more than that of middle part, and even more than that of lower part.