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Phenotypes of the Brassica oleracea parents and F2 population. (A) Two cabbage lines, “GZ87” and “263”. (B) The phenotypes of resistant (R) and susceptible (S) plants in the F2 population. (C) The clubroot degree of the F2 population was counted with the scale criterion from 0 to 4. Plants were inoculated with race 4 of Plasmodiophora brassicae.
