Schierup Mikkel H, Bechsgaard Jesper S, Nielsen Lene H, Christiansen Freddy B
Department of Ecology and Genetics, Institute of Biological Sciences, University of Aarhus, 8000 Aarhus C., Denmark.
Genetics. 2006 Jan;172(1):477-84. doi: 10.1534/genetics.105.045682. Epub 2005 Sep 12.
Identification and characterization of the self-incompatibility genes in Brassicaceae species now allow typing of self-incompatibility haplotypes in natural populations. In this study we sampled and mapped all 88 individuals in a small population of Arabidopsis lyrata from Iceland. The self-incompatibility haplotypes at the SRK gene were typed for all the plants and some of their progeny and used to investigate the realized mating patterns in the population. The observed frequencies of haplotypes were found to change considerably from the parent generation to the offspring generation around their deterministic equilibria as determined from the known dominance relations among haplotypes. We provide direct evidence that the incompatibility system discriminates against matings among adjacent individuals. Multiple paternity is very common, causing mate availability among progeny of a single mother to be much larger than expected for single paternity.
十字花科物种中自交不亲和基因的鉴定和特征分析，现在使得在自然种群中对自交不亲和单倍型进行分型成为可能。在本研究中，我们对来自冰岛的一小群琴叶拟南芥中的所有88个个体进行了采样和绘图。对所有植株及其部分后代的SRK基因处的自交不亲和单倍型进行了分型，并用于研究该种群中实际的交配模式。发现观察到的单倍型频率从亲代到子代在其确定性平衡附近发生了相当大的变化，该确定性平衡是根据单倍型之间已知的显性关系确定的。我们提供了直接证据，表明不亲和系统会抑制相邻个体之间的交配。多重父系现象非常普遍，导致单个母亲的后代之间的配偶可得性远大于单父系情况下的预期。
