在甘肃陇东雨养旱作条件下，研究了 21个美国德州冬小麦品种(系)扬花至灌浆期冠层温度与产量、水分利用效率之间的关系。结果表明，冬小麦不同扬花至灌浆期品种(系)间冠层温度、水分利用效率均存在显著差异。在当地气候和土壤条件下，冠层温度较低的品种(系)有1R17、1R11、1R38，其产量分别比21个供试材料的平均值 5.0 t/hm2高0.7、0.5、0.6 t/hm2，比产量最低的品种1R26高1.7 t/hm2；其WUE值分别比21个供试品种的平均值11.9 kg/(hm2· mm)高2.2、2.3、 1.0 kg/(hm2·mm)，比WUE最低的品种1R26[9.5 kg/(hm2·mm)]高4.7 kg/(hm2·mm)。

In this study， field experimentation were conducted at Zhenyuan， Gansu， China， Twenty one winter wheat genotypes from Bushland， Texas， USA .CTs were recorded from blooming to grain filling period.Results indicated that Genotypes showed great differences in CT， and the differences were presented by significant grain yield and WUE among genotypes， but the differences of ET(evaportranspiration)has not significant among in genotypes .In the local climate and soil conditions the wheat varieties which has lower canopy temperature such as 1R17， 1R11，1 R38 have high yield than 21 varieties tested average of 5.0 t/hm2 high 0.7 t/hm2， 0.5 t/hm2 and 0.6 t/hm2 and than the lowest yield varieties 1 R26(4.0 t/hm2) high 1.7 t/hm2； Their WUE than 21 varieties tested average 11.9 kg/hm2·mm high 2.2 kg/hm2·mm， 2.3 kg/hm2·mm and 1.0 kg/hm2·mm， than WUE minimum varieties 1 R26(9.5 kg/hm2·mm) high 4.7 kg/hm2·mm， they show the ability of alleviate the adverse effect of the heat and drought， keep strong transpiration rate， delay ageing， increase the intensity of grouting， so as to improve the production； Better use of limited soil water with strong drought resistant properties .

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