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作者	单位
海霞，刘景辉，杨彦明，赵洲，陈晓晶，贾硕	（内蒙古农业大学农学院/全国农业科研杰出人才及其创新团队/内蒙古“草原英才”创新团队，内蒙古呼和浩特 010019）

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中文摘要:

为了解盐胁迫下燕麦幼苗Na⁺、K⁺吸收和离子积累规律，以燕麦品种中耐盐性较强的Vao-9和耐盐性较弱的白燕5号为试验材料，用离子流检测技术研究了70 mmol·L^-1盐（NaCl和Na₂SO₄摩尔比1∶1混合）胁迫0、24、48和72 h后，幼苗根系Na⁺、K⁺ 流速、流向，并测定根、茎、叶中Na⁺、K⁺、Ca²⁺、Mg²⁺积累量。结果表明，盐胁迫48 h后，根系Na⁺外排速率显著增加（P＜0.05），且Vao-9的Na⁺外排速率显著高于白燕5号；K⁺外排速率随胁迫时间的延长呈增加趋势，Vao-9的K⁺外排速率显著低于白燕5号；燕麦在盐胁迫下体内Na⁺增加，K⁺下降，Ca²⁺、Mg²⁺变化不明显，但各器官中4种离子分配有差别；盐胁迫72 h时，Vao-9叶中Na⁺分配较白燕5号少5.2%，茎中多7.4%；Vao-9叶和茎中K⁺分配较白燕5号分别多4.4%和2.5%，Ca²⁺分配分别多3.5%和3.8%；叶片Ca²⁺积累量增加且Vao-9始终大于白燕5号，两品种茎中Ca²⁺、Mg²⁺积累量在胁迫72 h时差异显著，Vao-9叶中Na⁺/K⁺、Na⁺/Ca²⁺、Na⁺/Mg²⁺值均较白燕5号低。这说明较强的Na⁺外排能力和K⁺ 保持能力以及离子在植株各器官的合理分配是耐盐品种适应盐胁迫的重要途径。

英文摘要:

In order to understand the Na⁺ and K⁺ absorption and ion accumulation of oat seedlings under salt stress, the salt-sensitive variety Baiyan 5 and salt-tolerant variety Vao-9 were used to study the flow rate and direction of Na⁺ and K⁺ in roots and the accumulation of Na⁺, K⁺, Ca²⁺ and Mg²⁺ in roots, stems and leaves under the 70 mmol·L^-1 salt stress(NaCl∶Na₂SO₄=1∶1) for 24, 48, and 72 h. The results showed that the Na⁺ efflux was increased significantly in roots after salt stress for 48 h, and the Na⁺ efflux in Vao-9 was significantly higher than that in Baiyan 5. The K⁺ efflux was increased with the stress time, and the K⁺ efflux of Vao-9 was significantly lower than that in Baiyan 5. The Na⁺ content in oat plants was increased, and K⁺ content was decreased, but there were minor changes for Ca²⁺ and Mg²⁺ contents under salt stress, and the distribution of four ions in each organ was different. Under 72 h salt stress, the Na⁺ distribution to leaf in Vao-9 was 5.2% lower than that in Baiyan 5, and the Na⁺ distribution to stem in Vao-9 was 7.4% higher than that of Baiyan 5. The K⁺ distribution in leaf of Vao-9 was 2.5% higher than that of Baiyan 5, and the K⁺ distribution in stem of Vao-9 was 4.4% higher than that of Baiyan 5. The Ca²⁺ distribution in leaf of Vao-9 was 3.5% higher than that of Baiyan 5, and the Ca²⁺ distribution in stem of Vao-9 was 3.8% higher than that of Baiyan 5. The accumulation of Ca²⁺ in leaves of Vao-9 was increased higher than that of Baiyan 5. The accumulation of Ca²⁺ and Mg²⁺ in stems of the two oat cultivars showed significant difference at 72 h(P＜0.05). As a result, the ratios of Na⁺/Ca²⁺, Na⁺/K⁺ and Na⁺/ Mg²⁺ in leaves of Vao-9 were lower than those of Baiyan 5. The strong Na⁺ efflux ability and K⁺ retention ability and the rational distribution of ions in various organs of plants are important ways for the salt-tolerant cultivar to adapt salt stress.

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