Identification of the Putative Cytoplasmic Donor of a CMS System in <i>Brassica juncea</i>

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<jats:title>Abstract</jats:title><jats:p>Chloroplast (cp) and mitochondrial (mt) DNA restriction profiles of a cytoplasmic male sterile (CMS) line of <jats:italic>Brassica juncea</jats:italic> and its maintainer line were compared and found to be markedly different. Comparison of cpDNA restriction profiles of fifty different species of genus <jats:italic>Brassica</jats:italic> and some allied genera showed that the cpDNA profiles of CMS lines were similar to that of <jats:italic>B. tournefortii</jats:italic> for twenty different restriction endonucleases. This CMS system is thus not of spontaneous origin as reported earlier, but is alloplasmic in nature. Comparison of restriction profiles of mtDNA of <jats:italic>B. tournefortii</jats:italic> and CMS lines revealed some differences which might either be due to changes in DNA pattern during the transfer, or, due to the cytoplasm coming from a <jats:italic>B. tournefortii</jats:italic> line different from the one used in this study.</jats:p>

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