Abstract: In order to evaluate the drought resistance of Chenopodium quinoa resources and study the effects of osmotic regulators on drought resistance of quinoa seedlings, the seedlings of black quinoa, white quinoa, red quinoa and mongolian quinoa were treated with drought stress (DS) and watering (CK) to study the effects of drought stress on the morphological and physiological indexes of quinoa seedlings. Meanwhile, after pretreatment of quinoa seeds with water, 5% sucrose and 1% phosphoric acid, their seedlings were subjected to drought stress and watering treatments, and the effects of osmotic adjustment on the drought resistance indexes of seedlings were studied. Finally, the drought resistance of different quinoa resources was comprehensively evaluated. The results showed that: ① with the prolongation of drought stress time, the relative water content of quinoa leaves decreased gradually, the growth of quinoa seedlings was inhibited, the biomass accumulation decreased gradually, and the chlorophyll content increased first and then decreased. ② the drought resistance of quinoa seedlings from seeds treated with 5% sucrose was significantly higher by 22.22% than that of seedlings treated with water. However, the drought resistance of seedlings treated with 1% phosphoric acid was significantly lower than that of seedlings treated with water. It was indicated that 5% sucrose could improve the drought resistance of quinoa seedlings, while 1% phosphoric acid did not. ③ the membership function method drought resistance of four quinoa resources was comprehensively evaluated by, and the drought resistance performance was red quinoa > white quinoa > mongolian quinoa > black quinoa. To sum up, Red quinoa and White quinoa should be  planted in arid and semi-arid areas, and 5% sucrose could be used as osmotic regulator to improve the drought resistance of C. quinoa, which provided theoretical basis for the development of C. quinoa industry in arid and semi-arid areas of Northern China.

Key words: quinoa, drought stress, morphological characteristics, physiological traits, traits evaluation

摘要： 为了对藜麦资源进行抗旱性评价并研究渗透调节剂对藜麦幼苗抗旱性的影响，以黑藜(black quinoa)、白藜(white quinoa)、红藜(red quinoa )、蒙藜(mongolian quinoa)为试验材料，对其幼苗进行干旱胁迫（DS）和正常浇水（CK）处理，研究干旱胁迫对不同藜麦幼苗形态及生理指标的影响；同时用水、5%蔗糖和1%磷酸三种渗透调节剂对藜麦种子进行前处理后，对幼苗进行干旱胁迫和正常浇水处理，研究渗透调节剂处理种子对其幼苗的抗旱性指标影响，最后综合评价不同藜麦资源的抗旱性。结果表明： ①随着干旱胁迫时间的延长，藜麦叶片的相对含水量逐渐降低，藜麦幼苗生长受到抑制，生物量积累逐渐减少，而叶绿素含量则呈现先上升后降低的趋势。②渗透调节剂处理过的藜麦种子，其幼苗的抗旱性变化不同，5%蔗糖处理的幼苗抗旱能力较水处理显著高22.22%；而1%磷酸处理的幼苗抗旱能力显著低于水处理，表明5%蔗糖处理可以提高藜麦幼苗抗旱性，而1%磷酸对藜麦抗旱性影响不显著。③隶属函数法评价结果显示，4种藜麦资源的表现为红藜>白藜>蒙藜>黑藜。综上，在干旱半干旱地区种植藜麦，应优选抗旱性强的红藜和白藜，5%蔗糖可以作为提高藜麦抗旱性的渗透调节剂。研究结果为我国北方干旱半干旱地区的藜麦产业发展提供理论基础。

关键词: 藜麦, 干旱胁迫, 形态特征, 生理指标, 抗旱性评价