RPB2 gene phylogeny in flowering plants, with particular emphasis on asterids

Molecular Phylogenetics and Evolution
Bengt OxelmanBenjamin D Hall

Abstract

Two, apparently functional, paralogues of the RPB2 gene, which encodes the second largest subunit of RNA polymerase II, are shown to be present in two major groups of asterid plants. Although all other land plants surveyed so far have been found to have only one of these two copies, the RPB2 gene phylogeny inferred from the 3' half of the gene for 35 angiosperm taxa and six other land plants indicates that the duplication of the RPB2 gene occurred earlier than the time for origin of the asterid group, probably near the origin of "core eudicots." The d copy is present in all plants which are unambiguously assigned to the core eudicots, whereas the I copy is retained only in the lamiid clade, Ericales, and Escallonia, all belonging to the asterid group of plants. Both parsimony and likelihood analyses of sequences from the 3' half of the gene give strong bootstrap support for these conclusions. There is no support for monophyly of the taxa having both copies. Thus, numerous losses of one of the copies must be inferred. Structurally, both paralogues appear functional, and transcription is demonstrated for both copies. In the lamiid group, the d copy has lost introns 18-23. The well supported phylogenetic relationships implied by t...Continue Reading

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Citations

Feb 17, 2009·Journal of Plant Research·Izu A Fijridiyanto, Noriaki Murakami
Feb 5, 2013·Molecular Phylogenetics and Evolution·Elizabeth A Zimmer, Jun Wen
Jan 13, 2010·Molecular Phylogenetics and Evolution·Chodon Sass, Chelsea D Specht
Mar 19, 2009·Molecular Phylogenetics and Evolution·Ling-Yan JiangGui-Fang Zhao
Jan 9, 2007·Molecular Phylogenetics and Evolution·Jie LuoBenjamin D Hall
Jan 22, 2009·Evolution; International Journal of Organic Evolution·Nicolas Devos, Alain Vanderpoorten
Sep 29, 2011·Molecular Ecology Resources·Anne-Cathrine ScheenBengt Oxelman
Oct 27, 2005·Molecular Phylogenetics and Evolution·Meredith M ThomasRichard M Bateman
Apr 5, 2008·Molecular Phylogenetics and Evolution·Lyn G CookMichael D Crisp
Jul 31, 2012·Molecular Phylogenetics and Evolution·Elizabeth A Zimmer, Jun Wen
Dec 6, 2011·Molecular Phylogenetics and Evolution·Giovanni ZeccaFabrizio Grassi
Mar 20, 2012·Molecular Phylogenetics and Evolution·Catarina EkenäsKatarina Andreasen
Feb 14, 2009·Annals of Botany·Genlou SunTakao Komatsuda
Feb 18, 2011·Annals of Botany·William J BakerMark W Chase
Sep 19, 2020·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Anoja KurianE M Muralidharan
Jun 27, 2007·Molecular Phylogenetics and Evolution·Roser VilatersanaChristian Brochmann

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