关键词: 盐碱胁迫；燕麦, Na⁺/K⁺

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