Summary
Diploid pollen, with 19 chromosomes, from theF 1 hybrid plants (2n = 19) ofB. chinensis × R. sativus usually failed to grow on theF 1 stigmas. It was, however, fully capable of germination on the stigmas of swede (2n = 36) and of some other crosses. Also pollen of radish,B. chinensis, and swede was able to grow on theF 1 stigmas.
The sterility of theF 1 plants is attributed to the alteration of the chromosome balance between pollen and style from the usual 1n : 2n to 2n : 2n.
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References
Terasawa, Y. (1932). “Konstante amphidiploideBrassico raphanus Bastarde.”Proc. imp. Acad. Japan,8, 312–14.
—— (1933). “Crossing betweenBrassico raphanus andB. chinensis andRaphanus sativus.”Jap. J. Genet. 8, 229–30. (English abstract inPlant Breeding Abst. (1933),4, No. 177, p. 58.)
Watkins, A. E. (1932). “Hybrid sterility and incompatibility.”J. Genet.25, 125–62.
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Morris, L.E. Pollen germination inBrassica chinensis × Raphanus sativus F 1 hybrids. Journ. of Genetics 33, 435–441 (1936). https://doi.org/10.1007/BF02982898
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DOI: https://doi.org/10.1007/BF02982898