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首页> 外文期刊>Heredity: An International Journal of Genetics >Interspecific crossing and genetic mapping reveal intrinsic genomic incompatibility between two Senecio species that form a hybrid zone on Mount Etna, Sicily
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Interspecific crossing and genetic mapping reveal intrinsic genomic incompatibility between two Senecio species that form a hybrid zone on Mount Etna, Sicily

机译：种间杂交和遗传作图揭示了两个千里光物种之间固有的基因组不相容性，这两个物种形成了西西里岛埃特纳火山的杂种区

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摘要

Studies of hybridizing species can reveal much about the genetic basis and maintenance of species divergence in the face of gene flow. Here we report a genetic segregation and linkage analysis conducted on F 2 progeny of a reciprocal cross between Senecio aethnensis and S. chrysanthemifolius that form a hybrid zone on Mount Etna, Sicily, aimed at determining the genetic basis of intrinsic hybrid barriers between them. Significant transmission ratio distortion (TRD) was detected at 34 (～27%) of 127 marker loci located in nine distinct clusters across seven of the ten linkage groups detected, indicating genomic incompatibility between the species. TRD at these loci could not be attributed entirely to post-zygotic selective loss of F 2 individuals that failed to germinate or flower (16.7%). At four loci tests indicated that pre-zygotic events, such as meiotic drive in F 1 parents or gametophytic selection, contributed to TRD. Additional tests revealed that cytonuclear incompatibility contributed to TRD at five loci, Bateson-Dobzhansky-Muller (BDM) incompatibilities involving epistatic interactions between loci contributed to TRD at four loci, and underdominance (heterozygote disadvantage) was a possible cause of TRD at one locus. Major chromosomal rearrangements were probably not a cause of interspecific incompatibility at the scale that could be examined with current map marker density. Intrinsic genomic incompatibility between S. aethnensis and S. chrysanthemifolius revealed by TRD across multiple genomic regions in early-generation hybrids is likely to impact the genetic structure of the natural hybrid zone on Mount Etna by limiting introgression and promoting divergence across the genome.
机译：杂交物种的研究可以揭示有关基因流的遗传基础和物种多样性维持的更多信息。在这里，我们报告了遗传分离和连锁分析，该杂交对Senecio aethnensis和S. chssshemhemifolius在西西里岛Mount Etna上形成一个杂种区的倒交杂交进行了F 2子代，旨在确定它们之间固有杂种屏障的遗传基础。在检测到的十个连锁组中的七个中的九个不同的簇中的127个标记位点中，有34个（〜27％）检出了显着的传输比失真（TRD），表明物种之间的基因组不相容性。这些基因座上的TRD不能完全归因于合子后未能发芽或开花的F 2个体的选择性丢失（16.7％）。在四个基因座测试表明，合子前事件，例如F 1亲本的减数分裂驱动或配子体选择，促成了TRD。其他测试显示，细胞核不相容性在五个基因座处导致TRD，Bateson-Dobzhansky-Muller（BDM）不相容性涉及四个基因座处的基因间上位性相互作用导致TRD，而显性不足（杂合子缺陷）是一个基因座TRD的可能原因。在目前的地图标记密度下，主要的染色体重排可能不是造成种间不相容的原因。 TRD揭示了早熟杂种中多个基因组区域之间沙门氏菌和菊花沙门氏菌之间的内在基因组不相容性，可能会通过限制渗入并促进整个基因组的发散来影响埃特纳火山上天然杂种区的遗传结构。

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