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Synthesis and sterility of raphanobrassica

Summary

The synthesis of Raphanobrassica (2n=36, rrcc) from Raphanus sativus (2n=18, rr) and Brassica oleracea (2n=18, cc) is described a) by colchicine treatment of diploid hybrids; b) by crossing autotetraploid froms of the parent species.

The variation within R. sativus and B. oleracea suggests that a range of morphologically distinct Raphanobrassica forms may be created, some of which may have agronomic potential and in particular, it is hoped, Plasmodiophora resistance.

Inter-generic hybrids were readily obtained from crossing the parental species at both 2x and 4x chromosome levels, but only with R. sativus as female parent.

Details are given of the morphology, fertility and chromosome behaviour of both diploid F1 R. sativus × B. oleracea hybrids and of the amphidiploid Raphanobrassica.

Synthesized Raphanobrassica plants proved, in general, highly sterile. Some aneuploids resulted from 4x R. sativus × 4x B. oleracea crosses but most progeny were euploid and showed almost regular chromosome association. A number of stunted, deformed plants were obtained from both 2x and 4x crosses. Vigour, fertility and aneuploidy appeared unconnected in the amphidiploid.

Previous work on Raphanobrassica is reviewed. It is concluded that the extremely low fertility encountered in the present study is more likely to be the result of genic imbalance than to cytological anomalies which appear to be of lesser significance.

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McNaughton, I.H. Synthesis and sterility of raphanobrassica. Euphytica 22, 70–88 (1973). https://doi.org/10.1007/BF00021558

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  • DOI: https://doi.org/10.1007/BF00021558

Keywords

  • Plant Physiology
  • Colchicine
  • Female Parent
  • Parent Species
  • Brassica Oleracea