粳稻籽粒性状遗传分析

目的]对籽粒相关性状进行遗传分析,为水稻高产改良提供指导。方法]以秀水79和C堡构建的247个株系粳粳交重组自交系群体为试验材料,测定了籽粒相关性状(粒长、粒宽、粒重及长宽比)的表型值,利用主基因+多基因混合遗传模型对其进行遗传分析。结果]粳稻粒长和粒重都受到3对主基因控制,二者均无多基因控制。粒宽为2对主基因控制无多基因的作用方式,粒长、粒宽和粒重主基因的遗传率均在99%以上。籽粒长宽比由多基因控制。结论]粳稻粒长、粒重和粒宽受到主基因控制。

Genetic Analysis of Grain Traits in Oryza sativa ssp.japonica

Objective] Genetic analysis of grain traits in Oryza sativa ssp.japonica was concluded to provide references for high yield breeding of rice.Method] The phenotypic distributions of 4 grain traits (grain length,grain width,grain weight,length-width ratio) were determined with 247 strains of japonica-japonica cross recombinant inbred lines of Xiushui 79 × C Bao of Oryza sativa spp.japonica.Mixed major gene plus polygene inheritance models was used to analyze the four grain traits of Oryza sativa ssp.japonica.Result] The grain length and grain weight were controlled by three major genes without polygenes.Two major genes controlled the grain width without polygenes.The genetic rates of major genes of grain length,grain width and grain weight were all above 99％.The length-width ratio was mainly governed by polygenes.Conclusion] The grain length,grain weight and grain width were controlled by major genes.