Abstract
Artificially induced amphihaploid or amphidiploid Raphanobrassica (2n=18 or 2n=36, RC or RRCC) between radish (Raphanus sativus L., 2n=18, RR) and ornamental kale (Brassica oleracea L., 2n=18, CC) are favorable bridge plants in transferring some agronomic characteristics from one parental species to the other (NAMAI 1976, SARASHIMA & MATSUZAWA 1979). The chromosome addition lines of radish with single kale chromosome may provide an useful material for this breeding program. In this paper, cytological and morphological observations were made on the successive progenies which were derived from crossing of amphidiploid Raphanobrassica with radish, and then seven types of chromosome addition lines (2n=19) of radish with single kale chromosome were bred. Female parents used in the first generation were Rb-63 and Rb-74 lines of Raphanobrassica (2n=36, RRCC) which were bred by R. sativus L., (2n=18, RR)×B.oleracea L., var. acephala (2n=18, CC) (MATSUZAWA et al. 1985). Male parents were the same cultivars of Japanese radish as the female parent of Raphanobrassica.
