The invention relates to the technical field of
plant cell engineering, and particularly discloses a
plant protoplast semi-fusion breeding method which comprises the following three stages of
seedling material selection, preparation, fusion, induction and cultivation. A large number of fused
plant seedlings are obtained through a series of operations and used for large-scale planting. The method comprises the following steps: selecting excellent varieties of a plant A and a plant B, respectively preparing the plant A and the plant B into protoplasts in a preparation process, culturing the protoplasts into corresponding calluses, and performing half-
cell fusion on a fusion part to obtain mosaic calluses. Then, the
callus of the plant A to be used as the root is induced to locally induce adventitious roots, the
callus of the plant B to locally induce adventitious buds, and finally, breeding is carried out to obtain the super seedlings. According to the method, the
grafting principle is combined, the degree and conditions of
cell fusion are optimized, the breeding cost is reduced, meanwhile, it is ensured that the fusion body can stably express the excellent characters of parents at different parts, and agricultural large-scale production is facilitated.