草业学报Issue(3)：152-159,8.DOI:10.11686/cyxb20140317
NaCl处理对梭梭生长及生理生态特征的影响
Effects of salt treatments on the growth and ecophysiological characteristics of Haloxylon ammodendron
摘要
Abstract
A pot experiment was conducted to study the influence of different concentrations (0,50,100,200 and 400 mmol/L)of NaCl on the growth,the contents of hydrogen peroxide (H2 O2 )and malondialdehyde (MDA),the activities of superoxide dismutase (SOD),catalase (CAT),peroxidase (POD)and ascorbate per-oxidase (APX),water potential,and on the contents of soluble sugar and proline in the assimilation shoots of Haloxylonammodendron.The growth of H.ammodendron was promoted at a lower NaCl concentration (50 mmol/L).Compared with the control,plant height and basal stem diameter were significantly inhibited in the 400 mmol/L NaCl treatment,while crown area,dry mass of assimilation shoot and shoot dry mass were con-siderably reduced under NaCl treatments at concentrations ≥200 mmol/L and root dry mass was considerably reduced under NaCl treatments at concentrations ≥100 mmol/L.Thus,the suppressive effect on root dry mass was greater than on crown area,dry mass of assimilation shoot and shoot dry mass,which were more af-fected than plant height and basal stem diameter.Root/shoot ratios decreased markedly under NaCl treatments at concentrations ≥100 mmol/L compared with the control.Compared with the control,there were significant accumulations of H2 O2 and MDA in the assimilation shoot of H.ammodendron at higher NaCl concentrations and the activities of SOD,POD,CAT and APX increased at low NaCl concentrations (≤100 mmol/L),sug-gesting that together they play an important role in the scavenging of reactive oxygen species.However,the activities of CAT and POD began to reduce at NaCl concentrations ≥200 mmol/L compared with the control, indicating the scavenging efficiency of the antioxidative enzyme system weakened.Water potential reduced with an increase in NaCl concentrations.The contents of soluble sugar and proline initially increased but then de-creased compared with the control.关键词
梭梭/盐胁迫/MDA含量/抗氧化系统/渗透调节Key words
Haloxylon ammodendron/salinity stress/MDA content/antioxidative enzyme system/osmotic regulation分类
农业科技引用本文复制引用
鲁艳,雷加强,曾凡江,徐立帅,彭守兰,刘国军..NaCl处理对梭梭生长及生理生态特征的影响[J].草业学报,2014,(3):152-159,8.基金项目
中国科学院“西部之光”人才计划西部博士专项（XBBS201109）和国家自然科学基金项目（41301103）资助。 （）
