Hybrid Male Sterility in Mimulus (Phrymaceae) is Associated with a Geographically Restricted Mitochondrial Rearrangement

Cytoplasmic male sterility (CMS) and nuclear fertility restoration (Rf) involves intergenomic coevolution. Although male-sterile phenotypes are rarely expressed in natural populations of angiosperms, CMS genes are thought to be common. The evolutionary dynamics of CMS/Rf systems are poorly understoo...

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Bibliographic Details
Published in:Evolution 2008-05, Vol.62 (5), p.1026-1039
Main Authors: Case, Andrea L., Willis, John H.
Format: Article
Language:English
Subjects:
Alleles
Base Sequence
Breeding
Cells
Chimera
DNA, Mitochondrial - genetics
Evolution
Evolutionary biology
Flowers & plants
Gene Duplication
Genes
Genes, Essential
Genes, Mitochondrial - genetics
Genomes
Genotype & phenotype
Geography
Hybridity
Male infertility
Mimulus
Mimulus - genetics
Mimulus - physiology
Mimulus guttatus
Mitochondrial DNA
Molecular Sequence Data
Open Reading Frames - genetics
Original s
Phenotype
Phenotypes
Phrymaceae
Plant Infertility - genetics
Plant mitochondria
Plant populations
Plants
Population genetics
Recombination, Genetic - genetics
RNA - genetics
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Summary:Cytoplasmic male sterility (CMS) and nuclear fertility restoration (Rf) involves intergenomic coevolution. Although male-sterile phenotypes are rarely expressed in natural populations of angiosperms, CMS genes are thought to be common. The evolutionary dynamics of CMS/Rf systems are poorly understood, leaving gaps in our understanding of mechanisms and consequences of cytonuclear interactions. We characterized the molecular basis and geographic distribution of a CMS gene in Mimulus guttatus. We used outcrossing M. guttatus (with CMS and Rf) to self-fertilizing M. nasutus (lacking CMS and Rf) to generate hybrids segregating for CMS. Mitochondrial transcripts containing an essential gene (nad6) were perfectly associated with male sterility. The CMS mitotype was completely absent in M. nasutus, present in all genotypes collected from the original collection site, but in only two individuals from 34 other M. guttatus populations. This pattern suggests that the CMS likely originated at a single locality, spread to fixation within the population, but has not spread to other populations, indicating possible ecological or genetic constraints on dispersal of this CMS mitotype between populations. Extreme localization may be characteristic of CMS in hermaphroditic species, in contrast to geographically widespread mitotypes commonly found in gynodioecious species, and could directly contribute to hybrid incompatibilities in nature.
ISSN:0014-3820
1558-5646
DOI:10.1111/j.1558-5646.2008.00360.x