外源GA_3对盐胁迫下板蓝根种子萌发及幼苗生理生化指标的影响  

Effects of Exogenous GA_3 on Seed Germination and Physiological and Biochemical Indexes of Seedling of Radix isatidis Under Salt Stress

作　　者：杨彬[1] 张文斌 李翊华[1] 陈修斌[1] 黄若屏 张荣 YANG Bin ZHANG Wenbin LI Yihua CHEN Xiubin HUANG Ruoping ZHANG Rong(College of Agriculture and Biotechnology, Hexi University, Zhangye, Gansu 734000, China Zhangye Economic Crop Technology Promotion Station, Zhangye, Gansu 734000, China)

机构地区：[1]河西学院农业与生物技术学院,甘肃张掖734000 [2]张掖市经济作物技术推广站,甘肃张掖734000

出　　处：《土壤》2016年第6期1139-1143,共5页Soils

基　　金：甘肃省中药材产业科技攻关项目(GYC14-04)资助

摘　　要：以板蓝根品种安徽亳州种为试材,在100 mmol/L Na Cl盐胁迫处理下,研究了外源GA_3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GA_3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CO_2浓度的数值最大,分别为CO_2 5.53μmol/(m^2·s)、0.56 mmol/(m^2·s)、H_2O 216 mmol/(m^2·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/g FW、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 of Radix isatidis from Bozhou in Anhui Province as experimental material, under 100 mmol/L NaC1 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 pmol/（m2·s）, 0.56 mmol/（m2·s）, H20/216 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/g FW, 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 of Radix isatidis.

关 键 词：外源GA3 板蓝根 种子萌发 幼苗生理生化指标 

分 类 号：S682.119[农业科学—观赏园艺]