姜雪琪 樊忠慧 张卫东

摘要[目的]研究NaCl胁迫下红小豆种子萌发过程中生长发育的变化规律。[方法]选用冀红12红小豆为试验材料，采用9种不同浓度的NaCl溶液处理10 d，测定不同浓度NaCl胁迫对红小豆种子的发芽势、发芽率、发芽指数、活力指数、苗高、根长、侧根数等生理指标的影响。[结果]红小豆种子的发芽率和发芽指数在低浓度NaCl胁迫下呈上升趋势，高浓度NaCl胁迫下呈下降趋势且各浓度之间差异显著。苗高、根长、侧根数等生长指标均随NaCl浓度的升高而降低。[结论]高浓度NaCl胁迫对红小豆种子的萌发和生长具有抑制作用，且浓度越高抑制越显著。

关键词 NaCl胁迫；红小豆；萌发；抑制作用

中图分类号 S501 文献标识码 A 文章编号 0517-6611（2017）02-0045-02

Abstract [Objective]To study the change rule of growth and development in the process of red bean seed germination under NaCl stress.[Method] Red 12 red bean was chosen as research material， the processing of 10 d with 9 different concentrations of NaCl solution was done， and effect of different concentrations of NaCl stress on seed germination potential，germination rate， germination index， vigor index， seedling height， root length， lateral root number， etc. were studied.[Result]The results showed that germination rate and germination index of red bean rose under low NaCl concentration， high concentrations of NaCl showed a decreasing trend and the difference between the concentration was significant. Growth index of seedling height， root length， lateral root number， etc. decreased with the increase of NaCl concentration.[Conclusion] High concentration of NaCl stress on germination and growth of red bean has an inhibittong effect， and the higher the concentration， inhibition effect is more obvious.

Key words NaCl stress；Red bean；Germination；Inhibition effect

随着全球性环境的恶化，土壤盐渍化程度呈上升趋势，土壤盐渍化影响农作物生产问题已成为人们关注的热点[1]。我国是土壤盐渍化比较严重的国家，土壤盐渍地约占耕地面积的10%，制约了我国农业生产的发展，如何提高植物的耐盐性，使农作物产量不受盐渍土的影响一直是人们关注的课题[2-3]。於丙军等[4]对大豆苗期盐害离子效应进行了比较，结果表明，Na+和Cl-都是构成大豆盐害的毒性离子，且Na+、Cl-和NaCl对各大豆品种发芽率均有明显抑制作用。盐渍土产生较强Na+和Cl-的毒害作用，耐盐性低的植物在盐渍土中难以生存[5]。植物种子萌发是植物生活史中的重要阶段[6]，同时也是对盐胁迫较为敏感的时期，常将植物种子萌发期的耐盐性作为该品种的耐盐性[7]。……