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Phylogenetic analysis based on the Rtsp-1 insertion polymorphisms of the cultivars. The phylogenetic tree was constructed using the neighbour-joining method. The bootstrap values are shown. +The genetic relationships based on the Rtsp-1 and LIb (Supplementary Fig. S1) insertion polymorphisms were well consistent. *The genetic relationships among cultivars agreed well with the pedigree information (Supplementary Fig. S2).
