The tissues cultured seedlings of Siraitia grosvenorii were used as the material which were planted in the indoor cultivation and the soil with nutrition bought from market.The cultured seedlings of S.grosvenorii were add-ed different concentrations of Cd2+(0,10,50,100,200 mg?kgG1 )and Se2+(1 mg?kgG1 )into mediums under sterile conditions.The correlative photosynthetic characteristics indices were analyzed after cultivating 20 d.The results showed that the low concentration Cd2+had the effect on the contents of chlorophyll,photosynthetic rate(Pn),tran-spiration rate(Tr )and stomatal conductance(Gs)were not big or increased slightly.But under high concentrations treatment of Cd2+,the contents of chlorophyll,photosynthetic Rate(Pn),transpiration rate(Tr )and stomatal con-ductance(Gs)of leaves decreased obviously.With the increase of Cd2+ concentration,the rising trend appeared in leaf intercellular CO2 concentration,the addition of Se delayed the decline of chlorophyll,and made photosynthetic rate (Pn),transpiration rate (Tr ),stomatal conductance (Gs ) increased,but reduced the leaf intercellular CO2 concentration(Ci).It was shown that the toxicity of high concentrations of cadmium ions could also hurt photosyn-thetic characteristics of S.grosvenorii seedling,which,therefore,affected the growth of S.grosvenorii seedling.The mixed treatment of cadmium and selenium reflected that selenium had alleviated function on the toxicity of cadmium.%实验以罗汉果组培苗为材料，室内栽培在内装市售营养土的塑料盆中，以0、10、50、100、200 mg?kgG1浓度镉离子和1 mg?kgG1浓度硒处理，培养20 d后分析罗汉果幼苗的相关光合生理指标。结果表明：低浓度Cd2＋对叶片叶绿素含量、光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)影响不大或稍有上升，但高浓度镉离子处理植株叶片的叶绿素含量、光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)明显下降；随 Cd2＋处理浓度的增加，叶片胞间CO2浓度(Ci)呈现上升趋势；加硒则延缓叶绿素下降，促进光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)上升，降低叶片胞间CO2浓度(Ci)。表明高浓度镉离子的毒害导致罗汉果组培苗叶片光合性能受到伤害，从而影响罗汉果幼苗生长。镉硒混合处理反映出硒对镉的毒害有缓解作用。
展开▼
