水稻品种主要数量性状的遗传研究

本研究采用9个水稻品种为材料,经方差分析,估算了10个主要数量性状的遗传力,并进行了相关和通径分析,结果表明:①9个品种诸性状具有较大的遗传差异,广义遗传力以生育期、抽穗日数最高,每株穗数、结实率较低。②相关和通径分析以每穗粒数、穗粒重、株高和穗长对产量贡献较大,故选用亲本时应注重考虑大穗、穗粒数和粒重,同时兼顾株高是粳稻高产育种的一个方向。

A STUDY ON INHERITANCE OF MAIN QUANTITIVE CHARACTERS OF RICE VARIETIES

The broad -sense heritabilities of the quantitive characters of nine rice varieties were estimated and correlation and path analysis was conducted. The results indicated that (1) there were 10 great genetic differences among the nine varieties; the values of broad-sense heritability for growth period and date of heading were highest but that for spike numbers per plant and bearing rate were lower j (2) because of the great contributions to the yield, these characters of seed num- bers per spike, grain weight per spike, plant height and spike length should be considered at parent selection. This is a direction for high-yield breading in rice.