A New Type of Tetraploid (2n=40) Derived by Aneuploidy Breeding of Brassica crops
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Aneuploidy breeding was utilized as a method to develop a new type of diploid Brassica crop. Novel combinations of theA genome of Chinese cabbage and C genome of cabbage were established by crosing to produce a sesquidiploid and successivebackcrossing with B. campestris to produce aneuploids. Successive selfing resulted in aneuploids with chromosome complement rang-ing from 2n=21 to 2n=40. Among progenies in the BC2F3 and BC2F4 generations, plants with 2n=40 were selected and characterized.These plants were found to be stable cytogenetically but fertility was very low. A reciprocal cross was made but the resulting prog-enies with 2n=40 in the BC2F5 one derived from an initial cros with B. campestris as female parent and the other with B. oleracea as the female parent, were crosedand the resulting progenies were found to be stable in terms of chromosome number and fertility. Successive selfing for almost 10generations yielded progenies with 2n=40 only. Cytological and morphological analyses indicate distinct characteristics of a new typeof Brassica tetraploid. Now widely known in Korea as Ssamchoo, it is well suited to the eating culture of the Korean people.
Abstract
Aneuploidy breeding was utilized as a method to develop a new type of diploid Brassica crop. Novel combinations of theA genome of Chinese cabbage and C genome of cabbage were established by crosing to produce a sesquidiploid and successivebackcrossing with B. campestris to produce aneuploids. Successive selfing resulted in aneuploids with chromosome complement rang-ing from 2n=21 to 2n=40. Among progenies in the BC2F3 and BC2F4 generations, plants with 2n=40 were selected and characterized.These plants were found to be stable cytogenetically but fertility was very low. A reciprocal cross was made but the resulting prog-enies with 2n=40 in the BC2F5 one derived from an initial cros with B. campestris as female parent and the other with B. oleracea as the female parent, were crosedand the resulting progenies were found to be stable in terms of chromosome number and fertility. Successive selfing for almost 10generations yielded progenies with 2n=40 only. Cytological and morphological analyses indicate distinct characteristics of a new typeof Brassica tetraploid. Now widely known in Korea as Ssamchoo, it is well suited to the eating culture of the Korean people.