GENOTYPE BY ENVIRONMENT INTERACTIONS AND GENETIC CORRELATIONS INVOLVING 2 ENVIRONMENTAL-FACTORS
GENOTYPE BY ENVIRONMENT INTERACTIONS AND GENETIC CORRELATIONS INVOLVING 2 ENVIRONMENTAL-FACTORS
复制标题
DOI：
10.1007/bf00303929
复制
发表时间：
1983-01-01
影响因子：
5.4
通讯作者：
SAXTON, AM
中科院分区：
文献类型：
--
作者：
EISEN, EJ;SAXTON, AM
将一个性状的环境间遗传相关的概念推广到两个环境因子B和C。对同一性状定义了三种加性遗传相关：rG，在两个环境因子间; rG（B），在C和B内; rG（C），在B和C内。随着基因型x环境方差的增加，环境间的遗传相关性降低。这三种遗传相关在环境内存在遗传方差异质性的情况下，当它们由通常的方差分析（r*G，r*G（B），r*G（C））计算时，它们向下偏。导出校正因子以消除偏倚。基因型与环境的双向互作方差可因异质性而向上或向下偏置，但三向互作方差总是向上偏置。还推导了相互作用方差的校正因子。两个性状（X和Y）之间的4个加性遗传相关：rGxy，在B和C之间; rG（B）xy和rG（C）xy，在一个环境因素和另一个环境因素之间; rG（BC）xy，在B和C之间。这些概念被扩展到显性和母性效应的遗传相关性。父本半同胞和析因交配设计，以获得各种遗传相关。一个例子的父系半同胞设计与肉牛被用来说明的方法。
The concept of the genetic correlation for one trait across environments was extended to two environmental factors B and C. Three additive genetic correlations for the same trait were defined: rG, across both environmental factors; rG(B), across C and within B; and rG(C), across B and within C. As genotype x environment variances increase, the genetic correlations across environments decrease. These three genetic correlations are biased downward in the presence of heterogeneity of genetic variances within environments when they are calculated from the usual analysis of variance (r*G, r*G(B), r*G(C)). Correction factors were derived to remove the bias. The two-way genotype by environment interaction variances can be biased upward or downward by the heterogeneity, but the three-way interaction variance is always biased upward. Correction factors for the interaction variances were also derived. Four additive genetic correlations between two traits (X and Y) were derived: rGxy, across both B and C; rG(B)xy, and rG(C)xy, across one environmental factor and within the other; and rG(BC)xy, within both B and C. These concepts were extended to genetic correlations for dominance and maternal effects. Paternal half-sib and factorial mating designs were used to obtain the various genetic correlations. An example of a paternal half-sib design with beef cattle was used to illustrate the methodology.