Molecular Markers for Self-compatibility in Japanese Apricot (Prunus mume)

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  • 1 Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
  • 2 Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
  • 3 Horticulture Experiment Center of Wakayama Research Center of Agriculture, Forestry, and Fisheries, Wakayama 644-0024, Japan

Self-compatible cultivars of Japanese apricot (Prunus mume Sieb. et Zucc.) have a horticultural advantage over self-incompatible ones because no pollinizer is required. Self-incompatibility is gametophytic, as in other Prunus species. We searched for molecular markers to identify self-compatible cultivars based on the information about S-ribonucleases (S-RNases) of other Prunus species. Total DNA isolated from five self-incompatible and six self-compatible cultivars were PCR-amplified by oligonucleotide primers designed from conserved regions of Prunus S-RNases. Self-compatible cultivars exhibited a common band of ≈1.5 kbp. Self-compatible cultivars also showed a common band of ≈12.1 kbp when genomic DNA digested with HindIII was probed with the cDNA encoding S2-RNase of sweet cherry (Prunus avium L.). These results suggest that self-compatible cultivars of Japanese apricot have a common S-RNase allele that can be used as a molecular marker for self-compatibility.

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