Production and Identification of Interspecific Hybrids between Chinese Cabbage and Purple Cabbage Preliminary Studies on Isozymes and Protein of Hybrid from Brassica napus×Brassica oleracea Embryogenesis of Isolated-microspore in Cabbage(Brassica oleracea var.capitata) Construction of a High-density Molecular Linkage Map of Cabbage and QTLs Mapping of Several Quality Traits