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Single-nucleotide-polymorphism (SNP) is the most abundant genetic variation among individuals within a species. SNPs can be used as markers for gene discovery and for assessment of biodiversity. We established a practical strategy for discovering candidate SNPs in fruiting-mei ( Prunusmume  Sieb. et Zucc.), a non-model tree fruit, from amplified-fragment-length-polymorphism (AFLP) fragments. Eighty-one of the 150 chosen bands from 10 cultivars of fruiting-mei were successfully re-amplified and 67 of these re-amplified PCR products yielded 13 groups of reliable sequences. The sequencing results from both directions of 23 randomly selected PCR products using the corresponding selective primers showed that all the purified fragments from the gels were EcoR I-EcoR I fragments. The sequence alignment of 13 groups of sequence yielded 95 SNPs from a total of 5252 bp, averaging one SNP every 55 bp. Among these SNPs, 73 were heterozygous in the loci of some individual cultivars. The SNPs distribution were: 58% transition, 40% transversion, and 2% InDels. There were also one di-nucleotide polymorphism and one tetra-nucleotide deletion. The procedure of SNP isolation from AFLP fragments can be useful for transferring AFLP markers into sequence-tagged-site markers.

(270) Single-nucleotide-polymorphism Isolation in Fruiting-mei (Prunus mume Sieb. et Zucc.) from AFLP Fragments