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In order to study the inheritance of the purple leaves in pak-choi〔Brassica campestris L.ssp.chinensis(L.)Makino var.communis Tsen et Lee〕,a hybridization combination and its respective six-generations,Fl,F2,backcrosses Bl and B2 and their parents Pl and P2,were made with a purple and a green leaves in no-heading Chinese cabbage varieties.