| 不同藜麦品种对盐胁迫的生理响应及耐盐性评价 |
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| 引用本文： | 杨发荣,刘文瑜,黄杰,魏玉明,金茜.不同藜麦品种对盐胁迫的生理响应及耐盐性评价[J].草业学报,2017,26(12):77-88. |
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| 作者姓名： | 杨发荣 刘文瑜 黄杰 魏玉明 金茜 |
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| 作者单位： | 甘肃省农业科学院畜草与绿色农业研究所,甘肃兰州,730070 |
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| 基金项目： | 国家自然基金，甘肃省科技支撑计划项目，嘉峪关市科技项目 |
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| 摘 要： | 为研究不同藜麦品种对盐胁迫的生理响应及耐盐性,本试验以3个藜麦品种——陇藜1号、陇藜3号及陇藜4号为材料,在水培和盆栽条件下,分别用100、200、300、400、500 mmol/L Na Cl浓度模拟盐胁迫处理3个藜麦品种的种子和幼苗,通过测定种子发芽指标,幼苗生物量及生理生化特性,分析藜麦耐盐机制,对不同藜麦品种耐盐性进行综合评价。结果表明,随着Na Cl浓度的升高,不同藜麦种子发芽率先升高后减低,种子发芽势和发芽指数均显著降低;幼苗地上部分生长和生物量积累受到抑制,而地下部分生长及生物量积累先增加后下降;幼苗叶片叶绿素、可溶性蛋白含量、超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)和过氧化物抗坏血酸酶(APX)活性先升高后降低,均在300 mmol/L Na Cl浓度下达到最大值;幼苗叶片可溶性糖、脯氨酸、丙二醛(MDA)含量显著升高。说明不同藜麦品种幼苗在盐胁迫初期可通过采取提高体内可溶性糖和脯氨酸含量,增强SOD、POD、CAT和APX活性,降低MDA含量等自我保护机制以适应盐胁迫,从而促进适宜盐浓度下幼苗生长。隶属度综合评价结果表明,不同藜麦品种的耐盐阈值为300 mmol/L;陇藜1号耐盐性最强,陇藜3号次之,陇藜4号最弱。
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| 关 键 词： | 藜麦 幼苗 盐胁迫 生理机制 隶属函数 |
| 收稿时间： | 2016-11-02 |
Physiological responses of different quinoa varieties to salt stress and evaluation of salt tolerance |
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| YANG Fa-Rong,LIU Wen-Yu,HUANG Jie,WEI Yu-Ming,JIN Qian.Physiological responses of different quinoa varieties to salt stress and evaluation of salt tolerance[J].Acta Prataculturae Sinica,2017,26(12):77-88. |
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| Authors: | YANG Fa-Rong LIU Wen-Yu HUANG Jie WEI Yu-Ming JIN Qian |
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| Abstract: | The aims of this study were to evaluate the physiological responses of quinoa plants to salt stress and to compare salt tolerance among different quinoa varieties.Seeds and seedlings of different quinoa varieties were pretreated with 100,200,300,400,and 500 mmol/L NaCl solutions.The seed germination index,seedling biomass,and other physiological and biochemical characteristics were determined to analyze the mechanisms of salt tolerance in quinoa.The salt tolerance of the different quinoa varieties was evaluated by a membership function method.As the NaCl concentration increased,the seed germination percentage increased and then decreased,the germination potential and germination index decreased significantly,and the contents of chlorophyll and soluble proteins and activities of antioxidant enzymes (superoxide dismutase,peroxidase,catalase,and ascorbate peroxidase) increased and then decreased.The peak in the activities of the antioxidant enzymes was at 300 mmol/L NaCl.The contents of soluble sugars,proline,and malondialdehyde increased significantly as the NaCl concentration increased.These results suggested that increased contents of soluble sugars and proline,increased activities of antioxidant enzymes,and decreased malondialdehyde contents in seedlings may contribute to adaptation to salt stress and promote seedling growth in the presence of NaCl.In conclusion,the threshold of salt tolerance in quinoa seedlings was 300 mmol/L NaCl.Longli No.1 was the most salt-tolerant quinoa variety,and Longli No.4 was the least salt-tolerant variety. |
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| Keywords: | Chenopodium quinoa seedling salt stress physiology mechanisms membership function |
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