Starch phosphorylation in potato tubers is influenced by allelic variation in the genes encoding glucan water dikinase, starch branching enzymes I and II, and starch synthase III.

The sbei2ag SNP, which had a highly significant association with both C6 and C3 starch phosphorylation (C6 phosphorylation for both years, and C3 phosphorylation for 2011, at p < 0.001), encoded a serine/asparagine substitution at a position in the protein which tends to be conserved among homologous sequences, which have serine at this position.

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