Production and Identification of Interspecific Hybrids between Chinese Cabbage and Purple Cabbage

Interspecific hybridizations between different varieties of Brassica rapa L.ssp.peki-nensis (Lour.) Olsson and Brassica oleracea var.capitata L.were carried out. The hybrids were obtained by successive bud pollination and ovule culture and tested by means of identification by cytology.Results showed that 57 plants were obtained by interspecific hybridization between B.rapa L.ssp.pekinensis and B.oleracea var.capitata L.Cytological identification and pollen characteristics survey revealed that 47 of the hybrids had the anticipated chromosomes (2n=19) and pollen fertility was aborted; while 6 hybrids had 38chromosomes and were fertile.The BC₁ plants were obtained through back cross between fertile hybrids F₁ and B.rapa L.ssp.pekinensis.Field investigation showed that all F₁ hybrids had many characteristics from both parents,the BC₁ plants had obvious heading and were similar to B.rapa L.ssp.pekinensis.