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Molecular phylogeny of the genus Luzula DC. (Juncaceae, Monocotyledones) based on plastome and nuclear ribosomal regions: a case of incongruence, incomplete lineage sorting and hybridisation.

Abstract：

:The genus Luzula consists of 115 species distributed throughout the world. Luzula is monophyletic, but species relationships within the genus are difficult to determine primarily due to the similar morphology even within geographically remote taxa (especially within the section Luzula). The plastome trnL intron, trnL-F intergenic spacer and the nuclear ribosomal ITS1-5.8S-ITS2 regions were analysed using maximum parsimony and maximum likelihood reconstruction in 93 species of Luzula. The incongruent phylogenetic signals obtained from the chloroplast and the nuclear genomes point to incomplete lineage sorting as well as recent hybridisation in this group. Although tree-building analyses revealed several well-supported lineages, the outcomes for many groups were ambiguous. In the total evidence tree, Luzula species were grouped within six main clades (1. subgenus Marlenia, 2. subgenus Pterodes except for L. pilosa, 3. sections Anthelaea and Nodulosae, 4. sections Diprophyllatae and Thyrsanochlamydeae, 5. section Alpinae except for a few species and 6. section Luzula). The subgenus Marlenia occupies the early derived lineage within the genus Luzula. The traditionally accepted subgenera Pterodes and Luzula (and its sections) appear to be non-monophyletic. A statistical parsimony network approach showed that ancient haplotypes and ribotypes co-occur with their descendants in Luzula. Furthermore, many haplotypes are shared among different species. Within the Luzula section Luzula, both recent hybridisation and incomplete lineage sorting of ancestral polymorphisms may represent potential sources of the incongruence between chloroplast and nuclear data.

journal_name

Mol Phylogenet Evol

journal_title

Molecular phylogenetics and evolution

authors

Záveská Drábková L,Vlček C

doi

10.1016/j.ympev.2010.07.022

subject

Has Abstract

pub_date

2010-11-01 00:00:00

pages

536-51

issue

2

eissn

1055-7903

issn

1095-9513

pii

S1055-7903(10)00321-0

journal_volume

57

pub_type

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