Environmental effects of different latitudes on starch paste property of three types of gluten wheat in He′nan Province

Six wheat cultivars that represent strong, medium-strong and weak gluten properties were cultivated at five locations (from 32~N to 36~N) in Henan province to evaluate the variation of starch paste property. Results indicated that both the genotype and environment had significant effect on paste property of starch, but the effect of environment was more pronounced; values of peak viscosity, trough viscosity, breakdown and final viscosity showed an upward tendency with increasing latitude, whereas the variation of paste time was irregular. The variation coefficient of the starch paste property followed the order of: trough viscositypeak viscosityfinal viscositybreakdownpaste time. Among the six cultivars,Yumai50 had the lowest levels of starch paste property but with the largest variation coefficient. The correlation analysis showed positive relationships between the paste property and the accumulative temperature, sunshine hours, but a negative correlation was found between the paste property and the precipitation. The results of correlation analysis and stepwise regression also indicated that climate factors of different filling stages in May had different effects on the paste property, and that the paste property was more closely related to the climate of the first and the last 10-day period than the second 10-day period of May. Some suggestions were made on the improvement of starch property and regions suitable for planting for quality of winter wheat.