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Interspecific gene flow and an intermediate molecular profile of Dyckia julianae (Bromeliaceae), an endemic species from southern Brazil
Botanical Journal of the Linnean Society ( IF 2.4 ) Pub Date : 2019-11-19 , DOI: 10.1093/botlinnean/boz037
Luiza D Hirsch 1 , Camila M Zanella 1, 2 , Camila Aguiar-Melo 1 , Laís M S Costa 1 , Fernanda Bered 1
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When related species are distributed in sympatric populations, hybridization may occur. Likewise, one or more of these species may have arisen through historical hybridization between taxa. Here, we aim to elucidate the occurrence of hybridization among three Dyckia spp. (Bromeliaceae) from southern Brazil. We used seven nuclear and six plastid microsatellite loci to assess patterns of genetic diversity, population structure and hybridization in the three species. Furthermore, we performed manual crosses between species to test compatibility and fertility. The results showed that Dyckia julianae has an intermediate molecular profile, low gene flow occurs between Dyckia hebdingii and Dyckia choristaminea and higher gene flow occurs between D. julianae and the other two species. Plastid microsatellites identified 12 haplotypes that are shared among the species. The manual crosses between D. julianae and the other two species produced viable seeds, but no crosses between D. hebdingii and D. choristaminea generated fruits. Our data suggest that the reproductive barrier between D. julianae and the other two species is permeable. Further investigation into the hybrid origin hypothesis of D. julianae should be undertaken, as well as the mechanisms involved in reproductive isolation between D. hebdingii and D. choristaminea.

中文翻译:

种间基因流和Dyckia julianae(凤梨科),一种来自巴西南部的特有种的中间分子谱

当相关物种分布在同胞种群中时,可能会发生杂交。同样,这些物种中的一个或多个可能是由于分类单元之间的历史杂交而产生的。在这里,我们旨在阐明三种Dyckia spp之间杂交的发生。(凤梨科)来自巴西南部。我们使用七个核和六个质体微卫星基因座来评估这三个物种的遗传多样性,种群结构和杂交模式。此外,我们进行了物种之间的手动杂交以测试相容性和繁殖力。结果表明,Dyckia julianae具有中等分子谱,在Dyckia hebdingiiDyckia choristaminea之间发生低基因流动。较高的基因流发生在朱莉藻和其他两个物种之间。质体微卫星鉴定出在物种之间共有的12个单倍型。之间的手动杂交D. julianae和其他两个物种产生可行的种子,但之间没有杂交D. hebdingiiD. choristaminea产生果实。我们的数据表明,朱D科植物和其他两个物种之间的生殖屏障是可渗透的。进一步调查的混合起源假说D. julianae应进行,以及参与的生殖隔离的机制D. hebdingiiD. choristaminea
更新日期:2020-04-17
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