Analyses of amplified fragment length polymorphisms (AFLP) indicate rapid radiation of Diospyros species (Ebenaceae) endemic to New Caledonia

BMC Evolutionary Biology

Rosabelle Samuel¹  Mark W Chase³  Sutee Duangjai⁴  Jérôme Munzinger²  Ovidiu Paun¹  Barbara Turner¹ 

[1] Department of Systematic and Evolutionary Botany, Faculty of Life Sciences, University Vienna, Rennweg 14, 1030 Wien, Austria;IRD, UMR AMAP, TA A51/PS2, 34398 Montpellier Cedex 5, France;School of Plant Biology, The University of Western Australia, Crawley, WA 6009, Australia;Department of Forest Biology, Faculty of Forestry, Kasetsart University, Bangkok, Thailand

关键词: Woody plants;    Species radiation;    Progenitor/derivative relationships;    Morphological diversification;    Island flora;    Cryptic species;   

Others  :  858201
DOI  :  10.1186/1471-2148-13-269

 received in 2013-08-14, accepted in 2013-12-09,  发布年份 2013

【 摘 要 】

Background

Radiation in some plant groups has occurred on islands and due to the characteristic rapid pace of phenotypic evolution, standard molecular markers often provide insufficient variation for phylogenetic reconstruction. To resolve relationships within a clade of 21 closely related New Caledonian Diospyros species and evaluate species boundaries we analysed genome-wide DNA variation via amplified fragment length polymorphisms (AFLP).

Results

A neighbour-joining (NJ) dendrogram based on Dice distances shows all species except D. minimifolia, D. parviflora and D. vieillardii to form unique clusters of genetically similar accessions. However, there was little variation between these species clusters, resulting in unresolved species relationships and a star-like general NJ topology. Correspondingly, analyses of molecular variance showed more variation within species than between them. A Bayesian analysis with BEAST produced a similar result. Another Bayesian method, this time a clustering method, STRUCTURE, demonstrated the presence of two groups, highly congruent with those observed in a principal coordinate analysis (PCO). Molecular divergence between the two groups is low and does not correspond to any hypothesised taxonomic, ecological or geographical patterns.

Conclusions

We hypothesise that such a pattern could have been produced by rapid and complex evolution involving a widespread progenitor for which an initial split into two groups was followed by subsequent fragmentation into many diverging populations, which was followed by range expansion of then divergent entities. Overall, this process resulted in an opportunistic pattern of phenotypic diversification. The time since divergence was probably insufficient for some species to become genetically well-differentiated, resulting in progenitor/derivative relationships being exhibited in a few cases. In other cases, our analyses may have revealed evidence for the existence of cryptic species, for which more study of morphology and ecology are now required.

【 授权许可】

   
2013 Turner et al.; licensee BioMed Central Ltd.

【 图 表 】

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