伊犁河谷不同藜麦品种对盐胁迫的生理响应及耐盐评价

为了研究伊犁河谷不同藜麦品种对盐胁迫的生理响应、评价藜麦品种耐盐性，以NXSG56、NXSG85、HP9、GY3、QA13-9共5个藜麦品种为材料，分别用50、100、150、200、250、300、350、400 mmol·L^-1 NaCl溶液处理种子及幼苗，研究不同NaCl浓度对种子萌发、幼苗生长及生理指标的影响。结果表明，随NaCl浓度升高，藜麦种子发芽率、发芽势及幼苗地下部分干鲜重、叶片叶绿素含量、超氧化物歧化酶活性、胁迫初期叶片可溶性糖含量均呈先上升后下降趋势；幼苗叶片相对电导率、脯氨酸、丙二醛、Na⁺及后期叶片可溶性糖含量持续上升；地上部分干鲜重、纤维素及K⁺含量持续下降。说明各藜麦品种幼苗在受到NaCl胁迫时会通过提高渗透物质含量、增加根系吸收面积、增强超氧化物歧化酶活性等自我保护机制对抗盐胁迫。以上结果表明，NXSG85、NXSG56较其他品种耐盐，QA13-9对NaCl胁迫较敏感。

Physiological Responses of Different Quinoa Varieties to Salt Stress and Evaluation of Salt Tolerance in Yili Valley

In order to study the physiological responses of quinoa plants to salt stress and to evaluate salt tolerance among different quinoa varieties in Yili Valley， seeds and seedlings of different quinoa varieties were treated with NaCl solution of 50， 100， 150， 200， 250， 300， 350， 400 mmol·L^-1 respectively. The results showed that as the concentration of NaCl increased， the germination rate， germination energy of seeds， dry and fresh weight of the underground part， chlorophyll content， SOD activity， soluble sugar content of the seedlings， all first increased and then decreased. The relative electrical conductivity， proline， MDA， Na⁺ and soluble sugar content in leaves of seedling were continuously increased， but the content of cellulose， K⁺， dry and fresh weight of the aboveground parts decreased. It indicated that quinoa seedlings could resist salt stress by increasing osmotic substance content and root absorption area， enhancing SOD activity and other self-protective mechanisms under NaCl stress. Quinoa varieties of NXSG85 and NXSG56 were more salt-tolerant than others but QA13-9 more sensitive to NaCl stress.