Abstract: Na⁺/K⁺ ratio is an important indicator to evaluate saline-alkali tolerance of crops. Ca²⁺ can transfer saline-alkali stress signal and start a series of cascade reaction inside the crop to resist the stress. In order to evaluate the saline-alkali tolerance of different oat varies， ICP-MS was used to measure contents of Na⁺，K⁺ and Ca²⁺ in root，stem and leaf of four oat varieties，the detection limits of K⁺，Na⁺ and Ca²⁺ were 10.0， 8.0 and 5.0 ng/L respectively, under the optimum instrument conditions. The detection results showed that when pH value in soil was 8.0, the Na⁺/K⁺ ratio in organs of oat showed roots>stem>leaves, content of Ca²⁺ was root>stem>leaf>60 ng/L；when pH value in soil was 8.8, Na⁺/K⁺ ratio showed stem>root>leaf, content of Ca²⁺ was 35 ng/L>roots>stem>leaves. All four oat varieties maintain lowest Na⁺/K⁺ ratio in leaf under both higher and lower salt-alkali condition, which is one of the reasons for normal growth and strong salt-alkali tolerance of oats under salt-alkali condition.

Key words: saline-alkali stress, oat; Na⁺/K⁺ ratio

摘要： Na⁺/K⁺比值是衡量作物耐盐碱性的一个重要指标，Ca²⁺能够传递盐碱胁迫信号，开启作物体内一系列的级联反应来抵抗盐碱胁迫。为分析来自不同种植区燕麦主栽品种的耐盐碱性，本实验采用电感耦合等离子体质谱法对生长在两种pH盐碱土上4个裸燕麦栽培品种根、茎、叶中Na⁺、K⁺和Ca²⁺的含量进行测定，在优化的仪器条件下，Na⁺、K⁺和Ca²⁺的检出限分别为10.0 ng/L、8.0 ng/L和5.0 ng/L。检测结果显示，土壤pH为8.0时，燕麦各器官的Na⁺/K⁺比值是根>茎>叶，Ca²⁺含量是根>茎>叶>60 ng/L；在土壤pH为8.8时，燕麦各器官的Na⁺/K⁺比值为茎>根>叶，Ca²⁺含量35 ng/L>根>茎>叶；在高、低两种盐碱条件下，4个裸燕麦品种都能够维持叶片中Na⁺/K⁺比值最低，这是4个裸燕麦品种能够在盐碱条件下正常生长、具有较强耐盐性的原因之一。

关键词: 盐碱胁迫；燕麦, Na⁺/K⁺