HMW-GS Components of Some New Varieties in Guanzhong,Shaanxi Province

In order to understand the component situation and distribution characteristic of high molecular weight glutenin subunit(HMW-GS) in wheat varieties in Guanzhong,Shaanxi,the HMW-GS components,the frequency of HMW-GS and quality scores of the 60 new wheat varieties from the provincial trials of Shaanxi were investigated.The results showed that there were 13 glutenin subunits and 16 types of subunit combinations in the new wheat varieties.The major HMW-GS were subunit 1(60.0%) and Null(36.7%) in Glu-A1,subunit 7+9(38.3%) and 7+8(41.6%) in Glu-B1 and subunit 2+12(73.3%) in Glu-D1.The frequency of high quality subunits of 14+15 and 5+10 was 13.4% and 20.0%,respectively.Of the types of subunit combinations,(Null,7+8,2+12) and(1,7+9,2+12) were the main types and their frequency were all 18.3%.The frequency of quality subunit combination(1,14+15,5+10) was only 3.3%.There were some materials with rare subunits of 17+18,6+8 or 20 and combinations of(1,6+8,5+10),(1,20,5+10) and(Null,7+9,3+12).The averaged quality score of the 60 new wheat varieties was 7.1.There were 23 varieties(38.3%) with quality score over 8.These results indicated that the genetic basis of Glu-1 loci in new wheat varieties of Shaanxi province was better than before,but still was not satisfied.Therefore,in the quality breeding of wheat,selecting and introducing the alien quality subunits and their utilization should be strengthened.At the same time,pyramiding the quality subunits should be also paying more attention to.