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Molecular characterization of 3 alleles of the waxy gene from a non-waxy strain "Shikoku hadaka No. 84" (SH84), an indigenous waxy strain "Mochimugi D" (MMD), and an artificial waxy mutant strain "Shikoku hadaka No. 97" (SH97) of barley (Hordeum vulgare ssp. vulgare) was performed via a PCR direct sequencing strategy. The 3 haplotypes were analyzed in terms of single nucleotide polymorphisms, insertion/deletion mutations, and simple sequence repeat polymorphisms. In comparison with the barley non-waxy gene sequence deposited in the public DNA database, 110 polymorphic sites were found in the 5,190-bp sequenced region of the non-waxy strain SH84. A 418-bp deletion in the 5' non-coding sequence was identified in the indigenous waxy strain MMD. Except for the deletion in the promoter region, the spontaneous mutant wax allele and non-waxy allele were identical. Such highly conserved sequences provide evidence for the recent occurrence of a deletion event in the cultivated barley gene pool. Compared to the original variety SH84, induced waxy mutant SH97 had a base substitution of a C to T in the exon 5, which converting Gln-89 of the wild-type gene into a stop codon, suggesting the involvement of a nonsense-mediated mRNA decay. These results will be helpful for understanding the mechanism of the variable amylose content in waxy cultivars of cereal species.

Comparison of the waxy locus sequence from a non-waxy strain and two waxy mutants of spontaneous and artificial origins in barley.