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首页> 外文期刊>Genome >Introgressive hybridization between the allotetraploid Coffea arabica and one of its diploid ancestors, Coffea canephora, in an exceptional sympatric zone in New Caledonia.
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Introgressive hybridization between the allotetraploid Coffea arabica and one of its diploid ancestors, Coffea canephora, in an exceptional sympatric zone in New Caledonia.

机译：在新喀里多尼亚的一个特殊同胞带中，异源四倍体阿拉伯咖啡与它的二倍体祖先之一之间进行了渗入杂交。

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摘要

The importance of introgressive hybridization in plant evolution has long been recognized. Nevertheless, information on gene flow between allopolyploids and their diploid relatives is very limited, even though gene flow could play a major role in polyploid establishment and evolution. Here, we investigated the processes governing hybrid formation and introgression between the allotetraploid Coffea arabica and one of its ancestral diploid progenitors, C. canephora, in a sympatric zone of New Caledonia. The occurrence of a large assortment of hybridization events between the 2 coffee species is clearly established. First-generation hybrids (F1) and post-F1 hybrids were characterized. The involvement of unreduced gametes of C. canephora is suggested, because tetraploid F1 hybrid plants were detected. Moreover, although bidirectional mating was observed, only unidirectional gene flow from C. canephora to C. arabica was noted in post-F1 hybrids. Most of the collected post-F1 hybrid plants exhibited a high level of introgression, and the frequency of introgression observed among the different analyzed loci was homogeneous, suggesting no significant counterselection against introgressions from C. canephora. Overall, the New Caledonian central mountains appear to be a highly favourable environment for introgressive hybridization and a genetic diversity center for C. arabica.
机译：长期以来，渐渗杂交在植物进化中的重要性已得到公认。然而，即使基因流可能在多倍体的建立和进化中起主要作用，有关同素多倍体与其二倍体亲缘之间的基因流的信息却非常有限。在这里，我们调查了在新喀里多尼亚同域带的异源四倍体阿拉伯咖啡和其祖先二倍体祖细胞C. canephora之间杂合形成和渗入的过程。明确确定了这两种咖啡种类之间发生了各种各样的杂交事件。表征了第一代杂种（F1）和后F1杂种。由于未检测到四倍体F1杂种植物，提示了未还原的C. canephora配子的参与。此外，尽管观察到了双向交配，但在F1后杂种中仅注意到了从食蟹加拿大到阿拉伯咖啡的单向基因流动。大部分收集的F1后杂种植物表现出高水平的基因渗入，并且在不同的分析基因座中观察到的基因渗入频率是均一的，这表明没有明显的抗选择作用来对抗食蟹加拿大的基因渗入。总体而言，新喀里多尼亚中部山区似乎是进行渐渗杂交的高度有利环境，也是阿拉伯C. arabica的遗传多样性中心。

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