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A. Vainstein and H. Ben-Meir

Mini- and microsatellite probes were hybridized to DNA of 24 rose (Rosa×hybrida) genotypes. The resultant DNA fingerprints were shown to be genotype-specific, thereby enabling cultivar identification at the DNA level. Restriction enzyme Dra I yielded the most informative band patterns. Full-sib family analysis of DNA fingerprints revealed 32 parental-specific bands out of the 128 observed in the parents. These bands were revealed cumulatively by phage (M13), human (33.6), and oligonucleotide (GACA)4 probes. Only one pair of these loci was found to be allelic, and no linked pairs were detected in the progeny analyzed. The probability of two offspring from this cross having identical DNA fingerprints was calculated to be 2 × 10-8.

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U. Lavi, J. Hillel, A. Vainstein, E. Lahav, and D. Sharon

Application of four DNA fingerprint probes to avocado (Persea americana Mill.) resulted in identification of various cultivars, characterization of the three avocado races, and a genetic analysis of family structure. Genomic DNA from 14 cultivars was probed with four DNA fingerprint probes. Three of the probes gave well-resolved bands. The individual-specific patterns obtained for each cultivar validate the use of this technique for definitive cultivar characterization, with the probability of obtaining a similar pattern for two different cultivars being 2 × 10-9. DNA mixes representing either Mexican, Guatemalan, or West-Indian avocado races were hybridized with the DNA fingerprint probes, and a band pattern characteristic for each race was obtained. Progeny of a cross between the cultivars Ettinger and Pinkerton were analyzed. Their DNA fingerprints revealed one pair of linked bands and another band allelic to one of them. The application of these observations to identification, evolutionary studies, and breeding is discussed.