Hybridization between the endemic brown algae Carpophyllum maschalocarpum and Carpophyllum angustifolium (Fucales): Genetic and morphological evidence
Hybridization between the endemic brown algae Carpophyllum maschalocarpum and Carpophyllum angustifolium (Fucales): Genetic and morphological evidence
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DOI：
10.1111/j.1440-1835.2010.00583.x
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发表时间：
2010-10-01
影响因子：
1.5
通讯作者：
Zuccarello, Giuseppe C.
中科院分区：
文献类型：
--
作者：
Hodge, Fiona J.;Buchanan, Joseph;Zuccarello, Giuseppe C.
杂交是一种重要的进化过程，对生物多样性有着重要的影响.虽然杂交在植物中是众所周知的，但对杂交在其他界中的流行却知之甚少。在田间杂交已在褐藻中的少数情况下得到证实，主要是在北方墨角藻属中。在新西兰特有物种狭叶果叶（Carpophyllum angustifolium）和厚果（Carpophyllum maschalocarpum）中发现了假定的杂交种。我们使用核编码的分子数据（ITS 2）和形态计量学来确认C。angustifolium和C. maschalocarpum。收集具有杂合ITS2的推定的杂种菌体，每个拷贝对应于来自该群体的亲本物种之一。形态学分析还表明，这三类（两个亲本种和杂交种）在这些群体中很容易区分。结果发现，杂种有一个中间形态的亲种。有些人与C。angustifolium形态具有杂种ITS2核糖体类型，提示杂种与C.狭叶我们的数据揭示了另一种情况下的杂交内的墨角藻，并表明，这些物种如何保持分离的进一步研究是必要的。
P>Hybridization is an important evolutionary process, which can have significant effects on biodiversity. While hybridization is well known in plants, less is known about the prevalence of hybridization in other kingdoms. Hybridization in the field has been confirmed in brown algae in a few cases, mainly in the northern hemisphere genus Fucus. Putative hybrids have been found in the New Zealand endemic species Carpophyllum angustifolium and Carpophyllum maschalocarpum. We used nuclear-encoded molecular data (ITS2) and morphometrics to confirm hybridization between C. angustifolium and C. maschalocarpum. Putative hybrid thalli were collected that had heterozygous ITS2, each copy corresponding to one of the parental species from that population. Morphological analysis also showed that the three classes (two parental species and hybrids) were easily distinguishable in these populations. It was found that the hybrids had an intermediate morphology to the parent species. Some individuals with C. angustifolium morphology had hybrid ITS2 ribotypes suggestive of backcrossing between the hybrids and C. angustifolium. Our data reveal another case of hybridization within the Fucales and suggests that further research on how these species remain separate is needed.