Abstract:

To provide a basis for determining the optimum ecological areas of high-quality wheat varieties, 7 Xinjiang major wheat varieties with three types of gluten were planted on five typical ecological areas. The composition, expression of high-molecular-weight glutenin subunit (HMW-GS) and main quality characters were analyzed. The results showed that, there were 10 subunits and 6 subunit combinations in the tested materials; the HMW-GS expression differences among the varieties were significant or extremely significant, but they were different among different ecological areas. In terms of subunit types, the variation range of 2* subunit expression was the largest, and the variation range of 12 subunit expression was the smallest. As far as the ecological areas were concerned, HMW-GS expression of Qitai had the biggest variation, while that of Tacheng was relatively stable. The formation time, stabilization time and evaluation value affected by the ecological areas had obvious variation, and the variation of bulk density and water absorption were not obvious. The correlation of expression levels of 2*, 5, 8 and 9 subunits with the main quality traits were high, while 1, 2, 7, 10 and 12 subunits were not significantly correlated with the main quality traits. In conclusion, the ecological types of Xinjiang are complex and diverse, and the expression range of wheat glutenin subunits has a wide distribution, wheat varieties with different quality types should be planted according to the expression level of subunit to explore their quality potential.

Key words: wheat, HMW-GS, expression, quality characters, correlation