水稻功能基因标记遗传距离与杂种优势的相关性研究

Correlation Between Genetic Distance Based on Molecular Markers of Functional Genes and Heterosis in Rice

利用与产量性状相关的功能基因标记分析了29个杂交水稻组合亲本间(18个不育系和11个恢复系)的遗传差异,结合29个亲本所配组合(47个)的F1表现,研究了功能基因标记遗传距离与杂种优势的相关性。结果表明,功能基因标记遗传距离与产量杂种优势呈显著正相关(r=0.29*),而与其他主要产量构成因素的杂种优势相关不显著。说明功能基因标记有可能应用于杂交水稻杂种优势预测,但得到的相关系数偏小,还不足以预测杂种优势。

The genetic difference among twenty-nine rice parents （eighteen cytoplasmic male sterile lines and eleven re- storer lines） was analyzed by SSR molecular markers of functional genes related to yield traits. The col-relation between ge- netic distance and heterosis was studied by reference to the performance of forty-seven combinations. The results showed that the correlation between the genetic distance and yield heterosis was significant（r= 0.29 ＊ ）, indicating the possibility of fore- casting heterosis according to the genetic distance based on molecular markers of functional genes. The correlation between the genetic distance and the heterosis of other yield-related traits was insignificant. However, the correlation coefficient obtained in the study was too small to predict heterosis.