Abstract: Allotriploid hybrids (2n = 3x = 29, AAC) were produced by crossing tetraploid Chinese cabbage (Brassica campestris L. ssp. pekinensis AAAA, 2n = 4x=40) and diploid cabbage (B. oleracea var.capita ta L. CC, 2n = 2x = 18) using overy and ovule culture method, which will be used for constructing Chinese cabbage-cabbage addition lines, substitution lines and translocation lines. The allotriploid hybrids were similiar in morphological characters to Chinese cabbage, however the growth vigor was strong and the stem elongated quickly up to a height of about 2 m at flowering stage. And the pollen regularity and activity of hybrids were lower than that of diploid Chinese cabbage. The occurrence of diverse chromosome associations at diakinesis such as trivalent, bivalent and univalent suggested that the pollen-mother-cell's meiotic chromosome behavior of hybridswas complicated. The mean seed set derived from backcrossing by hybrids and diploid Chinese cabbage was 3.19%.

Key words: Chinese cabbage, Cabbage, Interspecific hybridization, In vitro culture, Reproductive character