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Theoretical and Applied Genetics

, Volume 75, Issue 2, pp 309–318 | Cite as

Interspecific hybrids between Brassica napus L. and B. oleracea L. developed by embryo culture

  • M. H. Quazi
Article

Summary

Interspecific hybrids between Brassica napus and B. oleracea are difficult to produce, and previous attempts to transfer economic characters from one species to the other have largely been unsuccessful. In these studies, oilseed rape cv. Tower (2n∶38) (B. napus) was crossed with broccoli and kale (2n∶18) (B. oleracea), and hybrid plants were developed from embryos in culture by either organogenesis or somatic embryogenesis. In rape × broccoli, F1 plants were regenerated from hybrid embryos and the plants produced viable selfed seeds. F5 plants (2n∶38) homozygous for white flower colour were selected for high oil content (47%) and Line 15; a selection from these plants produced fertile hybrids with rape, broccoli and kale without embryo culture. In reciprocal crosses between oilseed rape cv. Tower and an aphid resistant diploid kale, 28 and 56 chromosome F1 hybrid plants were regenerated from somatic embryos. The 56 chromosome plants were self-fertile and it was concluded from F2 segregation ratios that a single dominant gene controls resistance to cabbage aphid in kale. The 28 chromosome F1's were self-sterile, but these and the 56 chromosome F1's could be backcrossed to rape and kale. A cross between the F1 (2n∶56) and a forage rape resulted in the selection of a cabbage aphid (Brevicoryne brassicae L.) resistant line (Line 3). Both Line 15 and Line 3 can serve as bridges for gene interchange between B. campestris, B. napus and B. oleracea, which has not been possible hitherto. Hybridisations between rape and tetraploid kale produced F1 plants with 37 chromosomes. One F2 plant possessed coronal scales and the inheritance was shown to be controlled by a single recessive gene unlinked to petal colour.

Key words

Brassica Embryo culture Somatic embryogenesis Cabbage aphid resistance Brevicoryne brassicae L. 

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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • M. H. Quazi
    • 1
  1. 1.Crop Research DivisionDSIRLincolnNew Zealand

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