Abstract
‘Polima’ cytoplasmic male sterility (cms) was transferred in one step from spring to winter lines of oilseed rape ( Brassica. napus L.) by protoplast fusion. The transfer was confirmed by restriction fragment length polymorphism (RFLP) analysis of cytoplasmic DNA. Amphidiploid individuals with normal female fertility were recovered. The regenerated plants retained the winter habit. All traits studied were stable through subsequent sexual generations. The introduction of cms to winter lines by a conventional backcross normally takes 3 years; a similar alloplasmic substitution was achieved in approximately 9 months by protoplast fusion.
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