Brassicoraphanus
Intergeneric hybrid between cabbage and radish genera.
Brassicoraphanus, also written as × Brassicoraphanus, refers to any hybrid that crosses a plant from the genus *Brassica* (which includes cabbages and similar crops) with one from *Raphanus* (radishes). The name itself is a blend of the two genus names. This term covers both diploid and allopolyploid hybrids.
Early attempts to cross species from these two genera usually resulted in sterile or nearly sterile offspring. However, the Soviet agronomist Georgi Dmitrievich Karpechenko conducted large-scale experiments crossing *Raphanus sativus* with *Brassica oleracea*. Some of these plants were remarkable because they produced hundreds of seeds. The second generation turned out to be allopolyploids, formed when gametes with doubled chromosome numbers fused. Karpechenko realized this process had created a new species, which he felt could be called a new genus. He proposed the name *Raphanobrassica*, but the earlier name *Brassicoraphanus* has priority. Plants from this particular cross are now known as radicole. Karpechenko had hoped for a plant with cabbage leaves and a radish root, but got the opposite result. It is useful as livestock fodder, not for human consumption.
Two other fertile forms of Brassicoraphanus exist. The Raparadish group consists of allopolyploid hybrids between *Raphanus sativus* and *Brassica rapa*, also used as fodder. The Radicole group are allopolyploid hybrids between *Raphanus sativus* and *Brassica oleracea*, likewise used as fodder. Another form, Raphanofortii, is the allopolyploid hybrid between *Brassica tournefortii* and *Raphanus caudatus*. It is now thought that a large portion of flowering plants have some hybridization and polyploidization in their ancestry.
The name *Brassico-raphanus* was first published in 1825 by Augustin Sageret. He intended it as a hybrid genus name, but at the time, valid publication required the parent genera to be given in Latin, not French as he did. The hyphen was later removed following the International Code of Nomenclature for algae, fungi, and plants, resulting in *Brassicoraphanus*. Names using the hybrid symbol × were published later, in 1929 and 1932. In 1929, Karpechenko published the name × *Raphanobrassica* for the same combination of genera. As of December 2025, sources varied on which authority to use and whether to accept either, both, or neither of the two genus names.
- first_published
- 1920s (as Brassicoraphanus); the name Brassico-raphanus was used informally by Augustin Sageret in 1825 but not validly published
Lore & Background
Early experimental crosses between species of Brassica and Raphanus had been sterile or nearly sterile. 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. Karpechenko realized this process had created a new species, and proposed the name Raphanobrassica, but the earlier name Brassicoraphanus has priority.
Reader's Guide
Brassicoraphanus is significant as an early and well-documented example of allopolyploid speciation achieved through human experimentation. Karpechenko's work demonstrated that hybridization followed by spontaneous chromosome doubling could produce a fertile new species, a process now understood to be common among flowering plants. The hybrid's failure to produce the desired combination of cabbage leaves and radish roots, instead yielding the opposite, illustrates the unpredictability of genetic recombination. Despite this, the plant found practical use as fodder for livestock. The taxonomic history of Brassicoraphanus reflects the complexities of botanical nomenclature: Sageret's 1825 name was initially invalid due to a language issue, and later Karpechenko's Raphanobrassica competed with it. As of December 2025, sources varied in the authority used and which genus name they accepted. The case remains a classic teaching example in evolutionary biology and plant breeding.
Did You Know?
- The name Brassicoraphanus comes from combining the genus names Brassica and Raphanus.
- Karpechenko's experiments produced allopolyploids with doubled chromosome numbers, creating a fertile new species.
- The hybrid was intended to have cabbage leaves and radish roots, but produced the opposite.
- As of December 2025, sources varied on whether to accept Brassicoraphanus or × Raphanobrassica as the correct genus name.
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