在100 mmol/L的NaCl胁迫下，研究不同浓度外源SA对黄瓜种子萌发和幼苗生长的影响。结果表明，在盐胁迫下，添加外源SA可促进黄瓜种子的萌发和幼苗的生长，提高光合作用，降低有害物质MDA的含量，从而提高植株的抗逆性， SA浓度为2 mmol/L时，效果最好，黄瓜种子的发芽势、发芽率和发芽指数以及幼苗株高、主根长、地上鲜重、地下鲜重均达到最大值，其幼苗蒸腾速率、气孔导度、光合速率、胞间CO₂浓度最大，幼苗叶片MDA含量最低，为6.46 mol/gFW，最适合SA浓度为2 mmol/L。

The effects of different concentrations of exogenous SA on seed germination and seedling growth of cucumber were studied under 100 mmol/L NaCl stress. The results showed that under salt stress， the addition of exogenous SA could promote the germination of cucumber seeds and the growth of seedlings， increase photosynthesis， reduce the content of harmful substance MDA， and thus improve the stress resistance of cucumber plants. The germination potential， germination rate and germination index of cucumber seeds， plant height， main root length， aboveground fresh weight and underground fresh weight of seedlings reached the maximum under SA concentration 2 mmol/L treatment. At the same time， the values of transpiration rate， stomatal conductance， photosynthetic rate and intercellular CO₂ concentration were the highest. MDA content in leaves of cucumber seedlings was the lowest， and its value was 6.46 mol/gFW， the optimum concentration of SA was 2 mmol/L.

S330.2

甘肃省高校协同创新科技团队支持计划资助(2017C-18)。