In vitro Study on the Interactions between Determinant Factors of Self-Incompatibility in Brassica oleracea L. var.capitata L. In vitro Study on the Interactions between Determinant Factors of Self-Incompatibility in Brassica oleracea L. var.capitata L. Study on Difference of Photosynthesis in Cabbage(Brassica oleracea L. ) Cultivars(Heat-sensitive and Heat-tolerant) at High Temperature in High Light Photosynthetic Physiological Characteristics and Chloroplast Ultrastructure of Yellow Leaf Mutant YL-1 in Cabbage Photosynthetic Physiological Characteristics and Chloroplast Ultrastructure of Yellow Leaf Mutant YL-1 in Cabbage An Overwintering Spring Cabbage Cultivar‘Bochun’ An Overwintering Spring Cabbage Cultivar‘Wangan 8’ An Overwintering Spring Cabbage Cultivar‘Wangan 8’