不同粳稻品种群体整齐度的比较分析Ⅰ.整齐度的品种间差异及对产量的影响

The Comparison Analysis for the Uniformity of the Population in Different Roundgrained Rice Varieties 1. The Difference Among Different Varieties o fUniformity and the Influence to the Yield

对吉林省近年生产上主要推广应用的若干不同熟期水稻品种群体整齐度的研究结果表明：出穗日数和茎高等主要形态性状的群体整齐度品种间有明显差异，但各品种在各性状整齐度的表现上，差异并不完全一致，整齐度好的性状相对较多的品种有通３５、吉粳６３号和秋光。各性状整齐度与品种的熟期和类型无关。各性状整齐度之间亦存在明显差异，最整齐的性状是出穗日数（ｃｖ＝１．８２），然后依次为茎高（ｃｖ＝８．３２）、穗长（ｃｖ＝１１．１）、穗数（ｃｖ＝１４．０）、每穗一次枝梗数（ｃｖ＝１６．５）、每穗粒数（ｃｖ＝２９．０）和每穗空秕粒数（ｃｖ＝４５．９）。各性状的群体整齐度与产量的相关均不显著，但出租整齐度与空秕率的相关达到了显著水平，表现为出穗越不整齐，空秕率越高。因此，在新品种选育过程中，对出穗的要求还应“一刀齐”。

The uniformity of the population of a few defferent mature period rice varieties in pro- duction in Jilin, for present years , was studied. It showed that the uniformity of the population in vari- eties has clear differences in heading stage and panicle height of the main shapes and properties . But the differences aren't the same in the action of different varieties with the shape and the uniformity, the varieties are Tong 35, Jigeng 63 and Qiuguang, they have better uniformity and better properties. A- mong property uniformityes , clear differences are showed. the property has nothing to do with varietal mature period and the type. In the property, uniformity, there is clear difference, the property of the best uniformity is heading stage (cv=1.82)then in the order : the panide height (cv=8.32),the bength of the (cv=11.1),the number of the ear (cv=14.0),the number of the first stick per ear (cv=16.5),then umber of grains per ear (cv=29.0),the number of the empty and shrivelled grain per ear(cv=45.9).The uniformity of population of every propenty is not clear from the yield , but , heading uniformity is clear from the empty and shrivelled rate. It showed heading is not tidier ,the emp- ty and shrivelled rate is higher, so in the course of choosing and breeding the requirement to the head - ing should be" tidy like cutting with a knife" .