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Both the chloroplast and mitochondrial genomes are used extensively in studies of plant population genetics and systematics. In the majority of angiosperms, the chloroplast DNA (cpDNA) and mitochondrial DNA (mtDNA) are each primarily transmitted maternally, but rare biparental transmission is possible. The extent to which the cpDNA and mtDNA are in linkage disequilibrium is argued to be dependent on the fidelity of co-transmission and the population structure. This study reports complete linkage disequilibrium between cpDNA and mtDNA haplotypes in 86 individuals from 17 populations of Silene vulgaris, a gynodioecious plant species. Phylogenetic analysis of cpDNA and mtDNA haplotypes within 14 individuals supports a hypothesis that the evolutionary histories of the chloroplasts and mitochondria are congruent within S. vulgaris, as might be expected if this association persists for long periods. This provides the first documentation of the evolutionary consequences of long-term associations between chloroplast and mitochondrial genomes within a species. Factors that contribute to the phylogenetic and linkage associations, as well as the potential for intergenomic hitchhiking resulting from selection on genes in one organellar genome are discussed.

Linkage disequilibrium and phylogenetic congruence between chloroplast and mitochondrial haplotypes inSilene vulgaris