Contrasting evolutionary patterns of 28S and ITS rRNA genes reveal high intragenomic variation in Cephalenchus (Nematoda): Implications for species delimitation
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- 作者：Tiago José ; Pereira ; tiagojp@ucr.edu" class="auth_mail" title="E-mail the corresponding author ; James Gordon Baldwin james.baldwin@ucr.edu" class="auth_mail" title="E-mail the corresponding author
- 关键词：Cephalenchus ; Concerted evolution ; Nematode ; Polymorphism ; rRNA genes ; Secondary structure
- 刊名：Molecular Phylogenetics and Evolution
- 出版年：2016
- 出版时间：May 2016
- 年：2016
- 卷：98
- 期：Complete
- 页码：244-260
- 全文大小：5504 K
文摘
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Variation of ribosomal DNA (rDNA) repeats is reported across species of the plant parasitic nematode, Cephalenchus.
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Molecular data (28S and ITS rRNA genes) suggest that not all Cephalenchus species undergo concerted evolution.
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For some species, intragenomic variation is the source of genetic diversity, sometimes exceeding interspecific boundaries.
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Secondary structure analyses of both rRNA genes do not support the formation of pseudogenes to explain such variation.
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Cross-fertilization might contribute to the polymorphism observed on the rDNA repeats of some Cephalenchus species.