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首页> 外文期刊>Heredity: An International Journal of Genetics >Microsatellite DNA marker inheritance indicates preferential pairing between two highly homologous genomes in polyploid and hemisexual dog-roses, Rosa L. Sect. Caninae DC.
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Microsatellite DNA marker inheritance indicates preferential pairing between two highly homologous genomes in polyploid and hemisexual dog-roses, Rosa L. Sect. Caninae DC.

机译：微卫星DNA标记的遗传表明多倍体和两性犬玫瑰Rosa L. Sect中两个高度同源的基因组之间存在优先配对。犬DC。

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摘要

According to previous cytological evidence, the hemisexual dog-rose species, Rosa sect. Caninae, transmit only seven chromosomes (derived from seven bivalents) through their pollen grains, whereas egg cells contain 21, 28 or 35 chromosomes (derived from seven bivalents and 14, 21 or 28 univalents) depending on ploidy level. Two sets of reciprocal pairwise interspecific crosses involving the pentaploid species pair R. dumalis and R. rubiginosa, and the pentaploid/tetraploid species pair R. sherardii and R. villosa, were analysed for 13 and 12 microsatellite DNA loci, respectively. Single loci were represented by a maximum of three simultaneously occurring alleles in R. villosa, and four alleles in the other three parental plants. In the experimentally derived offspring, the theoretical maximum of five alleles was found for only one locus in the pentaploid progenies. Microsatellite DNA allele composition was identical with that of the maternal parent in 10 offspring plants, which were probably derived through apomixis. Almost all microsatellite DNA alleles were shared with the maternal parent also in the remaining offspring, but 1-4 alleles shared only with the paternal parent, indicating sexual seed formation. Analysis of quantitative peak differences allowed a tentative estimation of allelic configuration in the individual plants, and suggested that bivalent formation preferentially takes place between chromosomes that consistently share the same microsatellite alleles and therefore appear to be highly homologous. Moreover, alleles that were shared between the species in each cross combination comparatively often appear to reside on the bivalent-forming chromosomes, whereas species-specific alleles instead occur comparatively often on the univalent-forming chromosomes and are therefore inherited through the maternal parent only. Recombination then takes place between very similar genomes also in interspecific crosses, resulting in a reproduction system that is essentially a mixture between apomixis and selfing.Heredity (2004) 92, 139-150, advance online publication, 17 December 2003; doi:10.1038/sj.hdy.6800332
机译：根据以前的细胞学证据，这是一种两性犬蔷薇属玫瑰科。犬只通过其花粉粒仅传播7条染色体（由7个二价体衍生），而卵细胞则取决于倍性水平，包含21、28或35条染色体（由7个二价体和14、21或28个单价体衍生）。分析了分别涉及五倍体物种对杜鹃和R. rubiginosa，以及五倍体/四倍体物种对R. sherardii和R. villosa的两组相互成对的种间杂交，分别分析了13和12个微卫星DNA基因座。单个位点由绒毛红球菌中最多同时出现的三个等位基因代表，而其他三个亲本植物中最多有四个等位基因代表。在实验衍生的后代中，仅在​​五倍体后代中发现了一个基因座的五个等位基因的理论最大值。 10个后代植物中的微卫星DNA等位基因组成与其母本的相同，可能是通过无融合生殖获得的。在其余的后代中，几乎所有的微卫星DNA等位基因也与母本共享，但是1-4个等位基因仅与父本共享，表明有性种子形成。定量峰差异的分析允许对单个植物中的等位基因构型进行初步估计，并表明二价形成优先发生在始终共享相同微卫星等位基因并因此看起来高度同源的染色体之间。此外，每个交叉组合中物种之间共享的等位基因通常看起来似乎驻留在形成二价染色体上，而物种特异性等位基因则相反地通常出现在形成单价染色体上，因此仅通过母体遗传。然后重组也发生在非常相似的基因组之间，也发生在种间杂交中，从而形成一种繁殖系统，该系统实质上是无融合生殖和自交之间的混合物。Heredity（2004）92，139-150，在线提前出版，2003年12月17日; doi：10.1038 / sj.hdy.6800332

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