Journal of Molecular Evolution

, Volume 67, Issue 1, pp 111–122 | Cite as

Distribution and Evolution of Pseudogenes, Gene Losses, and a Gene Rearrangement in the Plastid Genome of the Nonphotosynthetic Liverwort, Aneura mirabilis (Metzgeriales, Jungermanniopsida)

  • Norman J. Wickett
  • Yu Fan
  • Paul O. Lewis
  • Bernard Goffinet
Article

Abstract

The plastid genome sequence of the parasitic liverwort Aneura mirabilis revealed the loss of five chlororespiration (ndh) genes. Additionally, six ndh genes, subunits of photosystem I, photosystem II, and the cytochrome b6f complex were inferred to be pseudogenes. Pseudogenes of cysA, cyst, ccsA, and ycf3, an inversion of psbE and petL, were also detected. The designation of pseudogenes was made using comparisons with the distantly related liverwort Marchantia polymorpha. We sampled several populations of A. mirabilis and its photosynthetic sister groups to correlate functional gene losses with the evolution of a achlorophylly. The gene losses, pseudogenes, or the psbE-petL inversion were never detected in a photosynthetic Aneura but were detected in every population of A. mirabilis. One population of A. mirabilis revealed a unique deletion of 541 bp in the psbE-petL region; another is characterized by a unique deletion of 471 bp in the trnV(UAC)-ndhC region. The ratio of synonymous-to-nonsynonymous substitution rates (ω) was estimated for eight pseudogenes and six ORFs to detect relaxed purifying selection. A significant increase in ω for the nonphotosynthetic liverwort was detected in six pseudogenes. Relaxation purifying selection, determined by a significant increase in ω, was detected for three intact ORFs: psbA, psbM, and rbcL.

Keywords

Aneura mirabilis Liverworts Bryophytes Chloroplast Cryptothallus Selective constraints Parasitic plants Pseudogenes 

Supplementary material

239_2008_9133_MOESM1_ESM.doc (218 kb)
MOESM1 (DOC 218 kb)

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Norman J. Wickett
    • 1
  • Yu Fan
    • 1
  • Paul O. Lewis
    • 1
  • Bernard Goffinet
    • 1
  1. 1.Department of Ecology and Evolutionary BiologyUniversity of ConnecticutStorrsUSA

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