【摘要】 以耐盐种质PI201239和PI201224为供试材料，采用0.1 mol/L NaCl溶液进行胁迫处理，并分别对胁迫处理后0、1、3、6、12 h辣椒幼苗的根、茎、叶中的Ca²⁺、K⁺、Na⁺、Cl^-等离子含量进行测定。结果表明，在NaCl的胁迫下，3个组织的Na⁺含量均有所提升，且在3～6 h叶片和根部的积累量最高；K⁺含量在叶和茎中呈现出不同程度的提升，而2种供试材料根中的K⁺含量均呈不断降低的趋势；不同剖位的K⁺/Na⁺值在0 h均较高，且在根中的K⁺/Na⁺值下降最为明显；另外，在胁迫1 h，叶片中的Cl^-和Ca²⁺能快速响应且含量达到最高。在NaCl胁迫下，2个耐盐材料具有相似的离子响应情况，关键离子在特定时期特定部位的积累可作为品种耐盐特性的关键指标。更多还原

【Abstract】 In the current study,salt-tolerant accessions PI201239 and PI201224 were used as test materials,and 0.1 mol/L NaCl was used to treat the tested accessions.The contents of Ca²⁺,K⁺,Na⁺,and Cl^-in the root,stem,and leaf of pepper seedlings were measured at 0,1,3,6 and 12 h after stress treatment.The results showed that under the condition of NaCl stress,the concentration of Na⁺in different tissues increased,and the accumulation effect of Na⁺in leaves and roots was more significant at3～6 h.The concentrations of K⁺in leaves and stems increased to different degrees,while the concentrations in roots of the two cultivars decreased continuously.In different tissues,there was a high K⁺/Na⁺at 0 h,and the changing trend of K⁺/Na⁺in the root was the most obvious and showed a decreasing trend.In addition,at 1 h after stress,Cl^-and Ca²⁺in leaves responded quickly and had the highest accumulation.In conclusion,under NaCl stress,the two salt-tolerant accessions had relatively consistent ion responses,and the accumulation of key ions in a specific tissue at a specific period could be used as a key indicator of the salinity tolerance of the cultivars.更多还原