High gene flow in two thrips-pollinated South-East Asian pioneer trees: genetic diversity and population structure of Macaranga hypoleuca and M. beccariana(Euphorbiaceae)

Daniela Guicking , and Brigitte Fiala , and Tim Kröger-Kilian , and Maryati Mohamed , and Kurt Weising, (2013) High gene flow in two thrips-pollinated South-East Asian pioneer trees: genetic diversity and population structure of Macaranga hypoleuca and M. beccariana(Euphorbiaceae). Botanical Journal of the Linnean Society, 173 . pp. 606-621.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/boj.121...

Abstract

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, namong 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.

Item Type:Article
Uncontrolled Keywords:ant plants ,Borneo , gene flow , myrmecophytism ,tropical rainforest
Subjects:Q Science > QK Botany
S Agriculture > SD Forestry
ID Code:8038
Deposited By:IR Admin
Deposited On:14 Feb 2014 12:15
Last Modified:17 Feb 2015 15:28

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