Summary
An extensive crossing program including 10 wild taxa and 23 accessions representing 6 major cultivated forms and landraces of theBrassica oleracea group was carried out. Data for crossability, germination, viability, fertility inF 1 andF 2 were studied as well as the meiotic chromosomal pairing inF 1 hybrids in some combinations. The fertility of hybrids between all cultivated forms and wild populations ofB. oleracea was high and it was concluded that all, including the Chinese endemicalboglabra form, belong to the same biological species. Among the other species,B. macrocarpa, B. montana, andB. rupestris had the lowest andB. cretica the highest fertility values in crosses with cultivated forms. The crossing data do not give any further information as to the genetic differentiation ofB. oleracea during the course of domestication. Introgression between wild and cultivated forms has probably occurred frequently. All members of theB. oleracea cytodeme belong to the primary and secondary gene pools of the 18 chromosomic crops and are as such of great importance for breeding purposes.
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von Bothmer, R., Gustafsson, M. & Snogerup, S. Brassica sect.Brassica (Brassicaceae). Genet Resour Crop Evol 42, 165–178 (1995). https://doi.org/10.1007/BF02539520
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DOI: https://doi.org/10.1007/BF02539520