Low-molecular-weight glutenin subunits (LMW-GS) account for about one-third of wheat seed storage proteins and have great effects on dough extensibility and food processing quality. Common wheat relative species are important genetic re-sources for wheat improvement. In this study, the specific primers of Glu-A3 genes were used to identify the allelic variations of GluA3-1, GluA-2, and GluA3-3 from nine accessions of Triticum dicoccoides, T. dicoccum, T. durum, and T. boeoricum. A total of 15 new haplotypes were identified, including five in GluA3-1, five in GluA3-2, and five in GluA3-3. Among them, two haplotypes each contained nine cysteines that might be good for improvement of wheat quality. The results about Glu-A3 genes in wheat further made clear composition of LMW-GS and provide a basis for selection of parents in wheat quality breeding.%低分子量麦谷蛋白约占小麦种子贮藏蛋白的三分之一,对面团延展性和食品加工品质有重要影响.普通小麦近缘种是小麦遗传改良的重要基因资源.本研究利用Glu-A3位点特异性引物对野生二粒小麦、栽培二粒小麦、硬粒小麦及野生一粒小麦共计9份材料进行GluA3-1、GluA3-2、GluA3-3基因扩增和鉴定,各发现5个等位变异,共计15个单元型;其中,有2个等位变异含有9个半胱氨酸残基,可能属于优良品质亚基.对小麦近缘种中这些Glu-A3位点等位变异的鉴别,进一步完善了小麦低分子量麦谷蛋白亚基的构成,并为小麦品质育种中亲本的选择提供了相应依据.
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