江西水利电力大学学报2026，Vol.45Issue(4)：60-67,8.
Cd2+胁迫下少根紫萍光合色素及PSⅡ荧光参数的响应特征
Response of photosynthetic pigments and PS Ⅱ fluorescence parameters of Landoltia punctata to Cd2+stress
摘要
Abstract
To investigate the effects of Cd2+stress on the photosynthetic system and water remediation potential of Landoltia punctata,an indoor hydroponic experiment was conducted with three Cd2+concentrations(0.5,2.0,and 5.0 mg/L).Photo-synthetic pigments,chlorophyll fluorescence parameters,and Cd2+accumulation were determined.The results show that with increasing Cd2+concentration,the contents of chlorophyll a,chlorophyll b,and carotenoids in Landoltia punctata decreased significantly.Compared with the control,these indices decreased by 81.11%,81.82%,and 77.10%at 5.0 mg/L Cd2+,re-spectively.Cd2+stress significantly inhibited the photochemical activity of PSⅡ.Both Fo and qN exhibited a trend of initial increase followed by subsequent decrease,whereas Fm,Fv/Fm,qP,Y(Ⅱ),and ETR decreased continuously.The reduction rates of Fv/Fm,Y(Ⅱ),and ETR reached 45.68%,54.17%,and 54.35%at 5.0 mg/L Cd2+,respectively.Y(NPQ)and Y(NO)showed an overall increasing trend.The Cd2+accumulation in Landoltia punctata increased markedly with elevated Cd2+concentration,reaching209.11 times that of the control at 5.0 mg/L.In conclusion,the inhibitory effect of Cd2+on Landoltia punctata was most severe at 5.0 mg/L.Landoltia punctata can alleviate Cd2+stress by regulating photochemical reactions and energy dissipation,demonstrating strong cadmium tolerance and accumulation capacity.关键词
少根紫萍/Cd2+胁迫/光合色素/荧光参数Key words
Landoltia punctata/Cd2+stress/photosynthetic pigments/fluorescence parameters分类
资源环境引用本文复制引用
冯英杰,王香莲,赖纪文,龙资,邹义龙,高桂青,徐满清,陈翀..Cd2+胁迫下少根紫萍光合色素及PSⅡ荧光参数的响应特征[J].江西水利电力大学学报,2026,45(4):60-67,8.基金项目
江西省自然科学基金项目(20242BAB25200,20232BAB215011,20252BAC200227) （20242BAB25200,20232BAB215011,20252BAC200227）
