RELATIONSHIP BETWEEN HETEROSIS AND HETEROZYGOSITY AT MARKER LOCI - A THEORETICAL COMPUTATION
RELATIONSHIP BETWEEN HETEROSIS AND HETEROZYGOSITY AT MARKER LOCI - A THEORETICAL COMPUTATION
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DOI：
10.1007/bf00226720
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发表时间：
1991-01-01
影响因子：
5.4
通讯作者：
GALLAIS, A
中科院分区：
文献类型：
--
作者：
CHARCOSSET, A;LEFORTBUSON, M;GALLAIS, A
本文研究了两个亲本间的遗传距离指数（基于标记位点信息）与在两个亲本杂交后代F中观察到的数量性状（由多个位点决定）的杂种优势之间的线性相关性。假设采用Fisher定义的双等位模型，对距离指数与杂种优势之间的相关系数rho进行了理论计算。当标记位点上的等位基因和QTL上的等位基因在整个群体中均匀分布时，系数rho是标记位点上的等位基因与QTL上的等位基因连锁不平衡的平方的函数。未被标记位点标记的QTL和未标记任何QTL的标记位点发挥对称作用，可显著降低-rho。我们的结论是，如果这些标记位点与所考虑的杂种优势性状中涉及的等位基因有关系，那么基于这些标记位点的杂交杂种优势预测将更加有效。
In this paper we have studied the linear correlation between a genetic distance index between two parent lines (based on marker loci information) and the heterosis observed in the F, hybrid from the two lines, for a quantitative character (determined by several loci, or QTL). Theoretical computations of the correlation coefficient (rho) between the distance index and the heterosis were made, assuming the biallelic model (defined by Fisher). When the alleles at both marker loci and QTL are equally distributed among the whole population of considered lines, the coefficient-rho is a function of the squares of linkage disequilibria between alleles at marker loci and alleles at QTL. The QTL that are not marked by marker loci and marker loci that do not mark any QTL play symmetrical roles and can decrease-rho greatly. We conclude that the prediction of F, hybrid heterosis based on marker loci would be more efficient if these markers were selected for their relationship to the alleles implicated in the heterotic traits considered.