USDA-ARS, Agronomy Department, Kansas State University, 66506, Manhattan, KS, USA.
Theor Appl Genet. 1984 May;68(1-2):145-53. doi: 10.1007/BF00252331.
Each of two sorghum (Sorghum bicolor (L.) Moench) cultivars were crossed with representatives of three wild sorghum races. Backcross-derived sorghum populations containing 3.125 to 50% wild germplasm were evaluated for grain yield, 100-kernel weight, days to flower, and plant height. Population means increased linearly with backcrossing for kernel weight, increased curvilinearly for grain yield, decreased curvilinearly for plant height, and changed erratically for days to flower. For all traits, the relationship between genetic variance and level of backcrossing deviated significantly from that expected based on an additive model. Genetic variance usually reached a maximum in the BC1 or BC2. The BC1 genetic variance for grain yield, averaged over matings, was twice as large as the average BC0 genetic variance. An epistatic model involving gene regulation is proposed as a plausible explanation for the results.
两个高粱（高粱 bicolor（L.）Moench）品种的每一个都与三个野生高粱品种的代表进行杂交。含有 3.125 至 50%野生种质的回交衍生高粱群体被评估其籽粒产量、千粒重、开花天数和株高。群体平均值随回交而对千粒重呈线性增加，对籽粒产量呈曲线增加，对株高呈曲线减少，对开花天数呈不规则变化。对于所有性状，遗传方差与回交水平之间的关系与基于加性模型的预期有显著差异。遗传方差通常在 BC1 或 BC2 中达到最大值。在交配中平均的 BC1 籽粒产量遗传方差是平均 BC0 遗传方差的两倍。提出了一个涉及基因调控的上位性模型作为对结果的一种合理解释。
