Evidence of hybrid speciation in the North American primroses Primula suffrutescensP. parryiP. rusbyi and P. angustifolia (Primulaceae)
Evidence of hybrid speciation in the North American primroses Primula suffrutescensP. parryiP. rusbyi and P. angustifolia (Primulaceae)
复制标题
DOI：
10.1080/11263504.2013.826745
复制
发表时间：
2015-03-04
期刊：
影响因子：
2
通讯作者：
Bullini, L.
中科院分区：
文献类型：
--
作者：
Cianchi, R.;Arduino, P.;Bullini, L.
对北美报春花（Auriculastrum）亚属四倍体（4x=44）种：P. suffrutescens、P. parryi、P. rusbyi和P. angustifolia的7个酶位点进行了遗传结构分析，并与相关的二倍体P. cuneifolia和P. nipponica进行了比较。所研究的四倍体物种在各个位点显示固定或几乎固定的杂合性，表明杂交起源。大约一半的等位基因与取样的杉木类群共享，这表明它们来自与母系杉木类祖先有关的杂交。从它们的基因型推断，对它们可能的父系物种进行了初步调查，在不同的报春花群体中进行。在黑麦亚属中观察到几个父系等位基因，特别是在结晶蕨组的分类群中（例如，P. chionantha， P. minor和P. nivalis xanthobasis）。然而，这些分类群中没有一个被证明是合适的父系物种。起源于P. suffrutescens、P. parryi、P. rusbyi和P. angustifolia的杂交事件可能发生在白令海陆桥更新世的二次接触中，涉及到一个类似杉木的母系祖先和至少两个父系物种，分别为suffrutescens和parryi组。进一步的研究，包括对来自西伯利亚的阿利利亚分类群进行遗传调查，将需要发现这种父系物种，如果没有灭绝的话。
The genetic structure of tetraploid (4x=44) North American species of Primula subgenus Auriculastrum: P. suffrutescens, P. parryi, P. rusbyi, and P. angustifolia was analyzed at seven enzyme loci and compared with that of the related diploid P. cuneifolia and P. nipponica. The studied tetraploid species showed fixed or almost fixed heterozygosity at various loci, indicating a hybrid origin. About half of their alleles were shared with Cuneifolia taxa sampled, suggesting that they arose from crosses involving a maternal Cuneifolia-like ancestor. A preliminary survey of their possible paternal species, as inferred from their genotypes, was carried out among different Primula groups. Several paternal alleles expected were observed in subgenus Aleuritia, particularly among taxa of sect. Crystallophlomis (e.g., P. chionantha, P. minor, and P. nivalis xanthobasis). However, none of these taxa proved to be a suitable paternal species. Hybridization events that originated P. suffrutescens, P. parryi, P. rusbyi, and P. angustifolia presumably occurred during Pleistocene secondary contacts in Beringia and involved a maternal Cuneifolia-like ancestor and at least two paternal species, for sect. Suffrutescens and Parryi, respectively. Further studies, involving a genetic survey of Aleuritia taxa from Siberia will be needed to detect such paternal species, if not extinct.