Thermoinhibition of Brassica rapa ssp. chinensis Seed Germination in Relation to Degrading Enzymes of Cell Walls Thermoinhibition of Brassica rapa ssp. chinensis Seed Germination in Relation to Degrading Enzymes of Cell Walls Effects of Medium Renovation and Colchicine Treatment on Embryogenesis of Isolated Microspores in Brassica rapa ssp. chinensis Differential Expression Analysis of Bud of Pol CMS and Its Maintainter Lineof Brassica rapa ssp. chinensis Through SRAP Differential Expression Analysis of Bud of Pol CMS and Its Maintainter Lineof Brassica rapa ssp. chinensis Through SRAP Cloning and Characterization of a Full-length cDNA of Pathogenesis-relatedProtein 1 in Brassica rapa ssp. chinensis Cloning and Characterization of a Full-length cDNA of Pathogenesis-relatedProtein 1 in Brassica rapa ssp. chinensis