Almond is one of the oldest nut crops in the world and has a main problem called self-incompatibility. Identification of S alleles in almond cultivars and genotypes is essential for breeders and growers. The aim of this study was to identify S alleles pattern in 30 late bloom and resistant to aphid, mite, Monilia laxa and "Polystigma occharaceum" fungus almond genotypes from different geographical regions of East-Azerbaijan Iran. Most of the S alleles were amplified using Pru-C2/Pru-C5R primer pair and size of alleles ranged between 2000-220 bp in genotypes. Considering all of the S alleles amplified using 5 primer pairs in thirty numbers of the genotypes two S alleles were detected and showed their fully self-incompatibility pattern, in 10 genotypes only one of the S alleles were.
Key words: Almond, S allele, specific primers, self-incompatibly, inter-incompatibility.
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