Molecular confirmation of natural hybridisation between Melastoma sanguineum and M. malabathricum (Melastomataceae)
Molecular confirmation of natural hybridisation between Melastoma sanguineum and M. malabathricum (Melastomataceae)
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血红野牡丹和马拉巴氏野牡丹（野牡丹科）之间自然杂交的分子证实
DOI：
10.26492/gbs72(1).2020-07
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发表时间：
2020-06
期刊：
影响因子：
--
通讯作者：
Zhou Rencao
中科院分区：
文献类型：
--
作者：
Ng Weilun;Huang Guilian;Wu Wei;Zhou Qiujie;Liu Ying;Zhou Rencao
众所周知，野牡丹属（Melastomataceae）经历了快速的物种辐射，并且只要两个或多个物种同时出现，就会观察到自然杂交的发生。在中国，野牡丹属物种之间已经证实了许多自然杂交的病例，但在东南亚（该属大多数多样性发生的地方）只证实了少数病例，尽管基于形态学中间性怀疑存在杂交。最近在马来西亚半岛，我们观察到了两种分布最广泛的野牡丹品种——血野牡丹 Sims 和 M. malabathricum L. 的共存种群。该地点还发现了许多具有中间形态的个体。在这项研究中，我们利用三个部分核基因和一个叶绿体基因座的DNA序列数据来确定中间个体的身份。我们发现叶绿体单倍型可以通过与两个物种对应的簇的相似性进行分组，并且相同的个体共享来自两个簇的核等位基因。我们的研究结果表明，（1）形态上处于中间状态的个体确实是野牡丹（Melastoma sanguineum）和马拉地牡丹（M. malabathricum）的杂交种； (2) 存在F1杂种和进一步的杂种后代； (3)这两个物种都可以作为花粉供体。
The genus Melastoma (Melastomataceae) is known to have undergone rapid species radiation, and natural hybridisation has been observed to happen whenever two or more species co-occur. Many cases of natural hybridisation have been confirmed between Melastoma species in China, but only a few cases have been confirmed in Southeast Asia, which is where the majority of the diversity of the genus occurs, although hybrids have been suspected based on morphological intermediacy. Recently in Peninsular Malaysia, we observed co-occurring populations of Melastoma sanguineum Sims and M. malabathricum L., two of the most widely distributed species of Melastoma L. Many individuals with intermediate morphologies were also at the site. In this study, we used DNA sequence data of three partial nuclear genes and one chloroplast locus to determine the identity of the intermediate individuals. We found that the chloroplast haplotypes could be grouped by similarity to clusters corresponding to the two species, and the same individuals shared nuclear alleles from both clusters. Our findings revealed that, (1) the morphologically intermediate individuals are indeed hybrids of Melastoma sanguineum and M. malabathricum; (2) both F1 hybrids and further hybrid generations are present; (3) both species can act as pollen donor.
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