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Early experimental crosses between species of these two genera had been sterile or nearly sterile, but large-scale experiments by Soviet agronomist Georgi Dmitrievich Karpechenko using Raphanus sativus and Brassica oleracea were remarkable because some of the plants produced hundreds of seeds. The second generation were allopolyploids, the result of gametes with doubled chromosome numbers. As Karpechenko realized, this process had created a new species, and it could justifiably be called a new genus, and proposed the name Raphanobrassica for them, but the earlier name Brassicoraphanus has priority.
Plants of this parentage are now known as radicole.
Two other fertile forms of Brassicoraphanus are known by the following informal names:
The Raparadish group are allopolyploid hybrids between Raphanus sativus and Brassica rapa, used as fodder crops
The Radicole group are allopolyploid hybrids between Raphanus sativus and Brassica oleracea, used as fodder crops
^Karpechenko, G. D. (1989) . "Polyploid hybrids of Raphanus sativus L. X Brassica oleracea L.". In Janick, J. (ed.). Classic papers in horticultural science. The Blackburn Press. pp. 442-525. ISBN9781930665064.
Lee, Soo-Seong; Lee, Sun-Ae; Yang, Jungmin; Kim, Jongkee (2010-11-27). "Developing stable progenies of ×Brassicoraphanus, an intergeneric allopolyploid between Brassica rapa and Raphanus sativus, through induced mutation using microspore culture". Theoretical and Applied Genetics. 122 (5): 885-891. doi:10.1007/s00122-010-1494-3. ISSN0040-5752. PMID21113703.