自交和回交衍生的自交和互交群体中的遗传方差和漂移。

Genetic variance and drift in selfed and intermated populations derived from backcrossing.

机构信息

USDA-ARS, Agronomy Department, Kansas State University, 66506, Manhattan, KS, USA.

出版信息

Theor Appl Genet. 1984 May;68(1-2):183-6. doi: 10.1007/BF00252336.

Abstract

The genetic variance among random-mated lines derived from backcrossing (BCgS1 lines) depends upon the backcross generation (g) and the number (n) of BCgF1 plants crossed in generations 1 through g. There is little effect of n on genetic variance for n > 6. The genetic variance among BCgF2-derived lines is greater than that among BCgS1 lines for all g. If either BCgF2-derived or BCgS1 lines are used as a base population for recurrent selection, 8, 16, 32, and 64 BC1F1, BC2F1, BC3F1, and BC4F1 plants, respectively, should be used to avoid loss of donor alleles to drift.

摘要

来自回交（BCgS1 系）的随机交配系的遗传方差取决于回交世代（g）和在第 1 到 g 世代中杂交的 BCgF1 植物的数量（n）。对于 n > 6，n 对遗传方差的影响很小。对于所有 g，BCgF2 衍生系的遗传方差大于 BCgS1 系的遗传方差。如果将 BCgF2 衍生系或 BCgS1 系用作反复选择的基础群体，则应分别使用 8、16、32 和 64 个 BC1F1、BC2F1、BC3F1 和 BC4F1 植物，以避免供体等位基因因漂移而丢失。