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《第九届中国林业青年学术年会论文摘要集》2010年
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The evolution and utility of ribosomal ITS sequences in Bambusinae and the related species:divergence,pseudogenes,and the implications for phylogeny

【摘要】:Ribosomal ITS sequences are commonly used for phylogenetic reconstruction because ITS sequences are highly reiterated as components of rDNA repeats and hence often are subject to rapid homogenization through concerted evolution,which promotes intragenomic uniformity of repeats even between loci on nonhomologous chromosomes.However,a number of studies have shown that the ITS polymorphism within individuals is quite common.Here we retrieved all ITS sequences of the members of broad concept Bambusa,Dendrocalamus,Dinochloa,Gigantochloa,Guadua,Melocalamus,Monocladus,Oxytenanthera,Thyrsostachys,Pleioblastus,Pseudosasa and Schizostachyum from GenBank.After excluding the sequences suspected representing paralogous loci,phylogenetic analysis of subtribe Bambusinae species were performed using the maximum parsimony and maximum likelihood methods.The implications of the findings are discussed.The risk of incorporating ITS paralogies in plant evolutionary studies which can distortion the phylogenetic signal should caution molecular systematists.
【分类号】:Q943

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