Single-Nucleotide Polymorphisms in Bmy1 Intron III Alleles Conferring the Genotypic Variations in β-Amylase Activity under Drought Stress between Tibetan Wild and Cultivated Barley

β-amylase activity is related to the polymorphisms of Bmy1 intron III; however, no attention has been given such relationships under environmental stresses as drought. In this study, 73 cultivated barley genotypes and 52 Tibetan wild accessions were used test association between gene III drought stress. Our results showed that three alleles, Bmy1.a, Bmy1.b, Bmy1.c, existed in examined genotypes. had a higher proportion whereas Bmy1.a. Impressively, with Bmy1.b significant increase stress, compared those Bmy1.a or indicating allele might provide more chances for developing cultivars water stress than both Bmy1.c alleles. Furthermore, XZ147, belonging type, significantly Triumph This be result unique amino acid substitution M527 composition R115, D165, A233, S347, XZ147.