关键词: 粳稻, 穗角, 稻米品质, 相关性, 主基因+多基因遗传模型

Abstract:

Linear correlation between panicle angle and 10 quality traits were studied by using P1, P2 and 349 lines of the RIL population in a cross of Bing 8979(erect panicle)/C bao (curve panicle) in japonica rice. We found that, there were no linear correlation between panicle angle and brown rice rate , head rice rate, chalky grain rate ,chalkiness area,gelatinization temperature, gel consistency and apparent amylose content. The correlation coefficients between panicle angle and milled rice rate, between panicle angle and grain length, and between panicle angle and grain length/width ratio were 0.124*, 0.470** and 0.241** , respectively. By using major gene-polygene mixed inheritance models, genetic analyses showed that brown rice rate, milled rice rate and apparent amylose content were controlled by two major genes plus polygenes. The two major genes expressed additive effect and additive×additive effects. Head rice rate, grain length, grain length/width ratio and gel consistency were controlled by two major genes with additive-epistatic effects plus polygenes. Chalky grain rate, chalkiness area and gelatinization temperature were controlled by three major genes with additive-epistatic effects plus po-lygenes. Brown rice rate, milled rice rate, head rice rate, chalky grain rate, chalkiness area and gelatinization temperature traits were mainly governed by major genes. Grain length，grain length/width ratio, gel consistency and apparent amylose content traits were mainly governed by polygenes.