Abstract
Protoplast fusion was utilised to transfer Polima type cytoplasmic male sterility (CMS) from Brassica napus, canola cv. Polima Karat (Pol-Karat) to B. oleracea, broccoli, var. “Green Comet”. Southern and RFLP analysis confirmed that four cybrids possessed nuclear genomes of broccoli with Polima mitochondria and chloroplasts. A fifth cybrid was a nuclear hybrid between broccoli and Pol-Karat, with Polima mitochondria and chloroplasts of broccoli. The broccoli type cybrids were morphologically similar to “Green Comet”, while the hybrid type was an intermediate of the two fusion parents. Flowers on the cybrids were distinctive in that although they possessed a morphology typical of Polima, they had very reduced petals. The broccoli type cybrids exhibited some female fertility, albeit low, establishing potential for F1 hybrid production.
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Yarrow, S.A., Burnett, L.A., Wildeman, R.P. et al. The transfer of ‘Polima’ cytoplasmic male sterility from oilseed rape (Brassica napus) to broccoli (B. oleracea) by protoplast fusion. Plant Cell Reports 9, 185–188 (1990). https://doi.org/10.1007/BF00232176
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DOI: https://doi.org/10.1007/BF00232176