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The complete nucleotide sequences of the 5 genetically distinct plastid genomes of Oenothera, subsection Oenothera: II. A microevolutionary view using bioinformatics and formal genetic data.
Mol. Biol. Evol. 25, 2019-2030 (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 coevolution. From representative species, we have recently reported complete nucleotide sequences of the 5 basic and genetically distinguishable plastid chromosomes of subsection Oenothera (I-V). In nature, Oenothera plastid genomes are associated with 6 distinct, either homozygous or heterozygous, diploid nuclear genotypes of the 3 basic genomes A, B, or C. Artificially produced plastome-genome combinations that 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.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
oenothera chloroplast genome; cytonuclear coevolution; interspecific plastome-genome incompatibility; speciation; Dobzhansky-Muller incompatibility; microevolution
ISSN (print) / ISBN
0737-4038
e-ISSN
1537-1719
Journal
Molecular Biology and Evolution
Quellenangaben
Volume: 25,
Issue: 9,
Pages: 2019-2030
Publisher
Oxford University Press
Non-patent literature
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Reviewing status
Peer reviewed