The feasibility of using RFLP to distinguish genetically related Hybrid Tea rose cultivars for DNA `fingerprinting' was examined with a group of cultivars related to `Peace'. The following cultivars used in this study, `Chicago Peace', `Flaming Peace', `Climbing Peace' and `Lucky Piece', were derived from bud mutations (sports) of `Peace'. We also investigated two additional cultivars, `Perfume Delight' and `Garden Party', in which one of the parents for each was `Peace'. Genomic rose DNA probes, cloned in pUC8 plasmid of Escherichia coli, were hybridized with genomic DNA of these cultivars digested with different restriction enzymes. Although polymorphisms were observed among these related cultivars, only a few probe/enzyme combinations screened produced RFLPs due to the high degree of genetic relatedness of these cultivars. We have identified probes that can distinguish all of these related rose cultivars. This study demonstrates that RFLP markers can be used effectively in DNA `fingerprinting' of genetically related rose cultivars, eventhough the level of detectable polymorphism is quite low.
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