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Chloroplast DNA evolution and the origin of amphidiploid Brassica species

by: J. D. Palmer, C. R. Shields, D. B. Cohen, T. J. Orton
In Theoretical and Applied Genetics, Vol. 65, No. 3. (1983), pp. 181-189, doi:10.1007/bf00308062  Key: citeulike:12133549

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Abstract

The origin and evolution of a hybrid species complex in the genus Brassica (cabbage, turnip, mustard, rapeseed oil) has been explored through mutational analysis of the maternally inherited chloroplast genome. A detailed chloroplast DNA phylogeny enables identification of the maternal parent for most of the amphidiploids examined and permits quantitative resolution of the relative time of hybridization as well as the relative divergence of the diploid parents. Contradictory chloroplast and nuclear phylogenies obtained for two accessions of the amphidiploid B. napus (rapeseed oil) lead to the hypothesis that introgressive hybridization has also figured in their recent evolution.


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