盐胁迫下赤霉素对黄瓜种子萌发及幼苗生长的影响

Effects of GA_3 on Seed Germination and Seedling Growth of Cucumber under Salt Stress

研究外源GA3对盐胁迫下黄瓜种子萌发和幼苗生长的影响。结果表明,添加不同质量浓度GA3的各处理,其发芽率、发芽势和发芽指数均显著高于NaCl胁迫处理,其中以100mg/L GA3处理的发芽势、发芽率和发芽指数最高,幼苗的叶面积、根长、根冠比也最大,同时叶片中叶绿素含量最高,幼苗叶片的光合速率(Pn)、气孔导度(Gs)、胞间CO2摩尔分数(Ci)及蒸腾速率(Tr)等均达到最大;而当赤霉素的质量浓度为50mg/L时,叶片中的POD活性为2 005U/(g·min),达最大值。

The effect of exogenous GAa on cucumber seed germination and seedling growth was stud- ied under the condition of salt stress. The results showed that： the germination rate, germination potential and germination index were significantly higher in the treatments of supplying different concen- trations of GAa than in the NaCl stress treatment only. In the treatment of 100mg/L GAa supplica- tion, the highest values of the germination potential, germination potential, germination index, seedling leaf area, root length, root /shoot ratio, the chlorophyll content in the leaves of seedlings, the leaf photosynthetic rate （Pn） , stomatal conductance （Gs）, intercellular CO2 molality fraction （C1） and transpiration rate （Tr） numerical index were obtained; however, the maximum value, 2 005 U/（g · min）, of POD activity in leaves were detected in the treatment of 50 mg/L GAa.