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首页> 外文期刊>Botanical Journal of the Linnean Society >High gene flow in two thrips-pollinated South-East Asian pioneer trees: genetic diversity and population structure of Macaranga hypoleuca and M. beccariana (Euphorbiaceae)
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High gene flow in two thrips-pollinated South-East Asian pioneer trees: genetic diversity and population structure of Macaranga hypoleuca and M. beccariana (Euphorbiaceae)

机译：两株蓟马授粉的东南亚先锋树中的高基因流：Macaranga hypoleuca和M. beccariana（大戟科）的遗传多样性和种群结构

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摘要

As a result of intensive exploitation, disturbed forests now dominate large areas of lowland tropical rainforest in South-East Asia. The genus Macaranga comprises some of the most important pioneer tree species of the region, among them M.beccariana and M.hypoleuca, two closely related obligate ant-plants pollinated by thrips. We used nuclear and plastid DNA markers to address questions of genetic diversity and population structure. Twelve plastid haplotypes were detected among 281 samples, three of which were shared between the two study species. Hybrids between the two species appear to be rare. Overall, genetic diversity in both species was moderate to high, with low levels of population differentiation, consistent with other tropical pioneer trees. Genetic structure was generally more pronounced in plastid than in nuclear data, indicating that gene flow via pollen may be more efficient than via seeds. Thrips apparently also serve as efficient pollinators over long distances, perhaps through a combination of passive dispersal by wind and active search for inflorescences in the target area. Our results indicate that M.beccariana and M.hypoleuca populations from recently disturbed habitats do not yet suffer from reduced genetic diversity or increased inbreeding
机译：由于集约化开发，目前动乱的森林在东南亚大片的低地热带雨林中占主导地位。 Macaranga属包括该地区一些最重要的先锋树种，其中M.beccariana和M.hypoleuca是由蓟马授粉的两种密切相关的专性蚂蚁植物。我们使用核和质体DNA标记来解决遗传多样性和种群结构的问题。在281个样品中检测到十二种质体单倍型，其中三个在两个研究物种之间共享。这两个物种之间的杂交似乎很少。总体而言，这两个物种的遗传多样性均处于中等至较高水平，种群分化水平较低，与其他热带先锋树一致。质体中的遗传结构通常比核数据中更为明显，这表明通过花粉的基因流动可能比通过种子的基因流动更为有效。蓟马显然还可以作为长距离传粉的有效传粉者，也许是通过风的被动传播和主动寻找目标区域的花序的结合。我们的结果表明，最近受到干扰的生境中的贝氏疟原虫和hypoleuca种群尚未遭受遗传多样性减少或近交繁殖增加的困扰

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