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MBE Advance Access published online on July 8, 2008
Molecular Biology and Evolution, doi:10.1093/molbev/msn149
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© 2008 The Authors.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Research Article

The complete nucleotide sequences of the five genetically distinct plastid genomes of Oenothera, subsection Oenothera: II. A microevolutionary view using bioinformatics and formal genetic data

Stephan Greiner*,1, Xi Wang{dagger},1, Reinhold G. Herrmann*, Uwe Rauwolf*, Klaus Mayer{dagger}, Georg Haberer{dagger} and Jörg Meurer*,{ddagger}

* Lehrstuhl für Botanik, Department Biology I, Botany, Ludwig-Maximilians-University, Menzinger Str. 67, 80638 Munich, Germany
{dagger} MIPS/IBI Institute for Bioinformatics and Systems Biology, Helmholtz Center Munich; German Research Center for Environmental Health GmbH, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany

{ddagger} Address correspondence to: Jörg Meurer, Lehrstuhl für Botanik, Department Biology I, Ludwig-Maximilians-University Munich, Menzinger Str. 67, 80638 Munich, Germany; Phone. +49 (0)89 17861288; Fax. +49(0)89 1782274; E-mail: joerg.meurer{at}lrz.uni-muenchen.de

Received for publication May 29, 2008. Accepted for publication July 1, 2008.

A unique combination of genetic features and a rich stock of information make the flowering plant genus Oenothera an appealing model to explore the molecular basis of speciation processes including nucleus-organelle co-evolution. From representative species we have recently reported complete nucleotide sequences of the five basic and genetically distinguishable plastid chromosomes of subsection Oenothera (I - V). In nature Oenothera plastid genomes are associated with six distinct, either homozygous or heterozygous, diploid nuclear genotypes of the three basic genomes A, B, or C. Artificially produced plastome-genome combinations which do not occur naturally often display interspecific plastome-genome incompatibility (PGI). In this study we compare formal genetic data available from all 30 plastome/genome combinations with sequence differences between the plastomes to uncover potential determinants for interspecific PGI. Consistent with an active role in speciation, a remarkable number of genes have high Ka/Ks ratios. Different from the Solanacean cybrid model Atropa/tobacco, RNA editing seems not to be relevant for PGIs in Oenothera. However, predominantly sequence polymorphisms in intergenic segments are proposed as possible sources for PGI. A single locus, the bidirectional promoter region between psbB and clpP, is suggested to contribute to compartmental PGI in the interspecific AB hybrid containing plastome I (AB-I), consistent with its perturbed photosystem II activity.

Key Words: Oenothera chloroplast genome • cyto-nuclear co-evolution • interspecific plastome-genome incompatibility (PGI) • speciation • Dobzhansky-Muller Incompatibility • microevolution

1 These authors contributed equally to this work.


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U. Rauwolf, H. Golczyk, J. Meurer, R. G. Herrmann, and S. Greiner
Molecular Marker Systems for Oenothera Genetics
Genetics, November 1, 2008; 180(3): 1289 - 1306.
[Abstract] [Full Text] [PDF]


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