利用IRRE反转录转座子展示标记对路易斯安那鸢尾的物种界限进行遗传图谱绘制。
Genetic mapping of species boundaries in Louisiana irises using IRRE retrotransposon display markers.
作者信息
Bouck Amy, Peeler Ryan, Arnold Michael L, Wessler Susan R
机构信息
Department of Plant Biology, University of Georgia, Athens, Georgia 30602, USA.
出版信息
Genetics. 2005 Nov;171(3):1289-303. doi: 10.1534/genetics.105.044552. Epub 2005 Aug 3.
Abstract
Genetic mapping studies provide insight into the pattern and extent of genetic incompatibilities affecting hybridization between closely related species. Genetic maps of two species of Louisiana Irises, Iris fulva and I. brevicaulis, were constructed from transposon-based molecular markers segregating in reciprocal backcross (BC1) interspecific hybrids and used to investigate genomic patterns of species barriers inhibiting introgression. Linkage mapping analyses indicated very little genetic incompatibility between I. fulva and I. brevicaulis in the form of map regions exhibiting transmission ratio distortion, and this was confirmed using a Bayesian multipoint mapping analysis. These results demonstrate the utility of transposon-based marker systems for genetic mapping studies of wild plant species and indicate that the genomes of I. fulva and I. brevicaulis are highly permeable to gene flow and introgression from one another via backcrossing.
摘要
遗传图谱研究有助于深入了解影响近缘物种间杂交的遗传不相容性的模式和程度。利用在正反交回交（BC1）种间杂种中分离的基于转座子的分子标记，构建了两种路易斯安那鸢尾（鸢尾属富尔瓦鸢尾和短茎鸢尾）的遗传图谱，并用于研究抑制基因渗入的物种屏障的基因组模式。连锁图谱分析表明，富尔瓦鸢尾和短茎鸢尾之间以表现出传递率畸变的图谱区域形式存在的遗传不相容性非常少，并且使用贝叶斯多点图谱分析证实了这一点。这些结果证明了基于转座子的标记系统在野生植物物种遗传图谱研究中的实用性，并表明富尔瓦鸢尾和短茎鸢尾的基因组通过回交对彼此的基因流动和基因渗入具有高度渗透性。
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