本试验证明:中_4、中_5两个远缘杂种后代材料,保留了其亲本天蓝堰麦草许多重要的抗旱优良特性,地下部根系发达,根冠比大,在土壤干旱条件下能主动调节根系活性,提高吸水能力.地上部叶片比孔面积小,蒸腾消耗低.在水分胁迫时能建立起开源节流的水分经济,保持较高的水分势.不同水分处理的光合作用、呼吸作用和细胞膜透性变化幅度小,恢复性好,对干旱有较强的适应性,是小麦抗旱育种良好的种质资源. The experiment proves that the materials of two distant hybrid progenies of Zhong4 and Zhong5 retain many important drought-resistant characteristics of their parent Azure weed. The root system of the underground part is well developed, and the ratio of root to shoot is large. Under the conditions of soil drought, Regulating root activity and increasing water absorption capacity.The aerial leaves of the shoots had smaller specific pore area and lower transpiration rate.When the water stress was applied, the economy of water resource was saved, and the water potential was maintained at a high level. The photosynthesis and respiration of different water treatments, Little change in permeability, good recovery, strong adaptability to drought, and is a good germplasm resource for drought resistance breeding of wheat.