Multiple diploid hybrid speciation of the Canary Island endemic Argyranthemum sundingii (Asteraceae)
Multiple diploid hybrid speciation of the Canary Island endemic Argyranthemum sundingii (Asteraceae)
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DOI：
10.1007/bf00985372
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发表时间：
2000-01-01
影响因子：
1.9
通讯作者：
Stabbetorp, OE
中科院分区：
文献类型：
--
作者：
Brochmann, C;Borgen, L;Stabbetorp, OE
有几个记录良好的例子，多倍体物种的多个杂交起源。在这里，我们报告的第一个，据我们所知，明确的例子，一个物种，最有可能起源于二倍体杂交物种形成。遗传关系和稳定的两个银菊种群的推定的混合起源特内里费岛，加那利群岛，进行了研究，使用染色体，形态测量，和生育力分析的栽培后代家庭和人工Fl和Fz杂交种。这些数据进行了比较，最近发表的叶绿体DNA的属，其中包括相同的人口。结果表明，这两个居群应归为一个种，即A. sundingii，这是二倍体，完全肥沃，遗传稳定，并出现在一个生态中间栖息地开放的森林砍伐，这一物种已经起源至少两次后，当地杂交在两个山谷。两种起源均涉及相同的亲本种，山地A. broussonetii和沿海A. frutescens。其中一个山谷的叶绿体供体为山地种，另一个山谷的叶绿体供体为沿海种。
There are several well-documented examples of multiple hybrid origins of polyploid species. Herein we report the first, to our knowledge, explicit example of a species that most probably has originated recurrently by diploid hybrid speciation. Genetic relationships and stabilization of two Argyranthemum populations of putative hybrid origin on Tenerife, the Canary Islands, were investigated using chromosomal, morphometric, and fertility analyses of cultivated progeny families and artificial Fl and Fz hybrids. These data were compared to a recently published chloroplast DNA phylogeny of the genus, in which the same populations were included. The results suggest that the two populations must be referred to a single species, A. sundingii, which is diploid, fully fertile, genetically stabilized, and occurs in an ecologically intermediate habitat opened by deforestation, and that this species has originated at least twice following local hybridization in two valleys. The same parental species were involved in each origin; the montane A. broussonetii and the coastal A. frutescens. The montane species was the chloroplast donor in one of the valleys and the coastal species in the other.