The Character on Drought Resistance and High Water Use Efficiency of Spring Wheat in Xinjiang

The character of drought resistance and high water use efficiency of new spring wheat varieties in Xinjiang was studied in this paper.Drought-resistant coefficient(DC),drought-resistant index(DI),drought yield index(DYI),high-water yield index(WYI) and yield-water high use efficiency index(YHWUEI) were calculated by analyzing the yield and agricultural character of all test varieties in drought and high-water conditions.The results showed that Xinjiang cultivated spring wheat variety had generally higher yield and drought resistance than introduced varieties.The DC of test varieties' yields and agricultural characters are almost not correlated with their yield under drought condition. However,the DI of test varieties' yields and some agricultural characters are highly correlated with the yield of test varieties under drought condition.And DYI was consistent with the yields of all test varieties under drought condition.By using DYI,WYI and YHWUEI,four high-water-use-efficiency cultivars were screened out,which had higher and steady yield under the condition of drought or high-water irrigation.These cultivars were Xinchun 2,Xinchun 6,Xinchun 7 and Xinchun 10, and their DYI,WYI and YHWUEI were over 1.05.In addition,these cultivars showed wider adaptability and higher and steady yield,high temperature tolerance and drought resistance during many years of spring wheat production in Xinjiang,especially in dry hot wind region,these cultivars are widely planted.