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Sinapis alba  possesses a number of desirable traits that can be employed to broaden genetic variability in  Brassica oleracea  or  B. napus . Using transgenic  B. oleracea  (CC, 2n = 18) as paternal plants and non-transgenic  S. alba  (SS, 2n = 24) as maternal plants, 11 hybrid plants were successfully obtained by using a combination of ovary culture and embryo rescue, while 2 seedlings of the reciprocal cross were generated but lost during the propagation. The hybridity of these plants was confirmed by flower color and other agronomic characteristics, chromosome counting, and pollen viability. Most of the intergeneric F 1  plants showed only one set each of S and C chromosome (SC, 2n = 21) and were male sterile, while a few plants were semi-fertile and had one set of S chromosomes but two sets of C chromosomes (CCS, 2n = 30). PCR, genomic Southern blotting and qRT-PCR for  bar  gene revealed that among the F 1  hybrid plants only 9.1% was  bar  positive and could be forwarded to F 2  and F 3  generation. The majority of F 3  plants obtained sufficient resistance to  Alternaria brassicae . Thus, the generation of disease ( A. brassicae ) and herbicide (Bastar) resistant intergeneric hybrids was of importance for breeding program. The existence of  bar  gene in these intermediate materials will facilitate the identification of hybridity and transfer of  S.alba  traits into target genetic background.

Analysis of intergeneric sexual hybridization between transgenic Brassica oleracea and Sinapis alba