کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2835166 1164334 2008 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A novel supermatrix approach improves resolution of phylogenetic relationships in a comprehensive sample of danthonioid grasses
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
A novel supermatrix approach improves resolution of phylogenetic relationships in a comprehensive sample of danthonioid grasses
چکیده انگلیسی

Phylogeny reconstruction is challenging when branch lengths vary and when different genetic loci show conflicting signals. The number of DNA sequence characters required to obtain robust support for all the nodes in a phylogeny becomes greater with denser taxon sampling. We test the usefulness of an approach mixing densely sampled, variable non-coding sequences (trnL-F; rpl16; atpB-rbcL; ITS) with sparsely sampled, more conservative protein coding and ribosomal sequences (matK; ndhF; rbcL; 26S), for the grass subfamily Danthonioideae. Previous phylogenetic studies of Danthonioideae revealed extensive generic paraphyly, but were often impeded by insufficient character and taxon sampling and apparent inter-gene conflict. Our variably-sampled supermatrix approach allowed us to represent 79% of the species with up to c. 9900 base pairs for taxa representing the major clades. A ‘taxon duplication’ approach for taxa with conflicting phylogenetic signals allowed us to combine the data whilst representing the differences between chloroplast and nuclear encoded gene trees. This approach efficiently improves resolution and support whilst maximising representation of taxa and their sometimes composite evolutionary histories, resulting in a phylogeny of the Danthonioideae that will be useful both for a wide range of evolutionary studies and to inform forthcoming realignment of generic delimitations in the subfamily.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Molecular Phylogenetics and Evolution - Volume 48, Issue 3, September 2008, Pages 1106–1119
نویسندگان
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