小麦远缘杂种材料中4,中5的抗旱生理特性

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 Physiological Characters of Drought Resistance in Wheat Distant Hybrid Zhong_4 and Zhong_5

The studies have proved that both Zhong4 and Zhong5 reserved many good characters of drought resistance coming from Elylrigin glauca, such as strong root system, high ratio of root with crown, capability to regulate the root vitality initiatively under drought condition and to increase water absorption, low ratio of stoma-area with leaf-area, low transpiration consm-ption, capability to set up a water system which can use water efficiently whenever water-stress emerges, having high water potential, little variation of photosynthesis, respiration and permeability of cell membrane when they are treated with different amounts of water and strong recoverability and high adaptability to drought. They are desired resources of wheat germplasm for drought-resistant breeding.