外源GA3对盐胁迫下板蓝根种子萌发及幼苗生理生化指标的影响

摘要

以板蓝根品种安徽亳州种为试材，在100 mmol/L NaCl盐胁迫处理下，研究了外源 GA3对盐胁迫下板蓝根种子萌发及幼苗生理生化指标的影响。结果表明：当外源 GA3的浓度达到100 mg/L时，板蓝根种子萌芽能力和幼苗生长表现最优；同时，幼苗光合速率、蒸腾速率、气孔导度和胞间 CO2浓度的数值最大，分别为 CO25.53µmol/(m2·s)、0.56 mmol/(m2·s)、H2O 216 mmol/(m2·s)和287 mg/L；幼苗叶片中 MDA含量达最低，而 POD和 SOD活性最高，其值分别为0.336µmol/gFW、26.65 U/(g·min) FW和272.53 U/(g·min) FW，可有效缓解盐胁迫对板蓝根种子萌发和幼苗生长造成伤害。%Taken the varieties ofRadix isatidis from Bozhou in Anhui Province as experimental material, under 100 mmol/L NaCl salt stress, the effects of exogenous GA3 were studied on seeds germination and seedling physiological biochemical indexes. The results showed that when the concentration of exogenous GA3 100 mg/L, seeds germination and seedlings growth were optimal; at the same time, photosynthetic rate, transpiration rate, stomatal conductance and intercellular CO2 concentration reached the maximum values, were CO2 5.53 µmol/(m2·s), 0.56 mmol/(m2·s), H2O/216 mmol/(m2·s) and 287 mg/L, respectively; MDA content in seedling leaves was the lowest while the activities of POD and SOD were the highest, were 0.336 µmol/gFW, 26.65 U/(g·min) FW and 272.53 U/(g·min) FW, respectively, which can effectively alleviate salt stress damage to seeds germination and seedling growth ofRadix isatidis.