This study investigates arsenic (As) accumulation and tolerance of duckweed Spirodela polyrhiza L. and its potential for As phytofiltration. S. polyrhiza was able to survive in high concentration of As(V) solution...This study investigates arsenic (As) accumulation and tolerance of duckweed Spirodela polyrhiza L. and its potential for As phytofiltration. S. polyrhiza was able to survive in high concentration of As(V) solution. The EC 50 values (± SE) based on the external As(V) were (181.66 ± 20.12) μmol/L. It accumulated (999 ± 95) mg As/kg dw when exposed in 320 μmol/L As(V) solution for one week, and was able to take up appropriately 400 mg As/kg dw in tissues without a significant biomass loss. The EC 50 values (the effective concentration of As(V) in the nutrient solution that caused a 50% inhibition on biomass production) was (866 ± 68) mg/kg dw for the tissues, indicating that S. polyrhiza had a high capability of As accumulation and tolerance. The uptake kinetic parameters V max was (55.33 ± 2.24) nmol/(g dw·min) and K m was (0.144 ± 0.011) mmol/L. Within 72 hr, S. polyrhiza decreased As concentration in the solution from 190 to 113 ng/mL with a removal rate of 41%. The study suggested that this floating aquatic plant has some potential for As phytofiltration in contaminated water bodies or paddy soils.展开更多
对紫萍[Spirodela polyrhiza(Linn.) Schleid.]3个克隆和兰氏萍[Landoltia punctata(G. Meyer) Les et D. J. Crawford]3个克隆的所有克隆分株的单株叶状体数,单叶状体的根数、总根长和平均根长以及叶状体的长度和宽度进行分析,基于微...对紫萍[Spirodela polyrhiza(Linn.) Schleid.]3个克隆和兰氏萍[Landoltia punctata(G. Meyer) Les et D. J. Crawford]3个克隆的所有克隆分株的单株叶状体数,单叶状体的根数、总根长和平均根长以及叶状体的长度和宽度进行分析,基于微卫星标记扩增结果对6个克隆在各微卫星位点的基因型进行分析,并对各微卫星位点与2种浮萍生长性状的关联性进行分析,还对2种浮萍各微卫星位点不同基因型间的生长性状进行多重比较。结果表明:紫萍单叶状体的根数、总根长和平均根长及叶状体宽度在3个克隆间以及兰氏萍各生长性状在3个克隆间均存在显著(P<0.05)差异。紫萍3个克隆在Sp25、Sp30、Sp47和Sp53位点的基因型不同,兰氏萍3个克隆在Sp10、Sp14、Sp16、Sp42、Sp47、Sp51、Sp52和Sp53位点的基因型不同;紫萍3个克隆在Sp6、Sp14、Sp16、Sp25、Sp36、Sp45、Sp47和Sp51位点的基因型和等位基因与兰氏萍不同;2种浮萍6个克隆在Sp4、Sp12、Sp28、Sp29和Sp43位点的基因型相同。Sp25、Sp30、Sp47和Sp53位点与紫萍单叶状体的根数、总根长和平均根长的关联性极显著(P<0.01),Sp30位点与其叶状体的长度和宽度的关联性显著,Sp25位点与其叶状体宽度的关联性也显著。Sp10、Sp14、Sp16、Sp42、Sp47、Sp52和Sp53位点与兰氏萍单株叶状体数和单叶状体根数的关联性极显著,Sp10、Sp14、Sp42、Sp47、Sp51、Sp52和Sp53位点与其叶状体的长度和宽度的关联性显著或极显著,Sp16、Sp51及Sp53位点与其单叶状体的总根长和平均根长的关联性极显著。Sp47和Sp53位点BD基因型紫萍的根明显偏多且偏长,Sp51和Sp53位点AD基因型兰氏萍的根明显偏长;并且,Sp25位点CE基因型紫萍的叶状体最多且最大,其根也最多且最长。研究结果显示:供试的微卫星标记具有属间标记通用性,可用于紫萍和兰氏萍基因型分析;Sp25、Sp30、Sp47和Sp53位点与紫萍根的长度和数量密切相关,而Sp10、Sp14、Sp16、Sp42、Sp47、Sp51、Sp52和Sp53位点与兰氏萍叶状体的数量和大小以及根的数量密切相关。展开更多
基金supported by the Chinese Academy of Sciences(No.KZCX1-YW-06-03)the National Natural Science Foundation of China(No.20720102042)
文摘This study investigates arsenic (As) accumulation and tolerance of duckweed Spirodela polyrhiza L. and its potential for As phytofiltration. S. polyrhiza was able to survive in high concentration of As(V) solution. The EC 50 values (± SE) based on the external As(V) were (181.66 ± 20.12) μmol/L. It accumulated (999 ± 95) mg As/kg dw when exposed in 320 μmol/L As(V) solution for one week, and was able to take up appropriately 400 mg As/kg dw in tissues without a significant biomass loss. The EC 50 values (the effective concentration of As(V) in the nutrient solution that caused a 50% inhibition on biomass production) was (866 ± 68) mg/kg dw for the tissues, indicating that S. polyrhiza had a high capability of As accumulation and tolerance. The uptake kinetic parameters V max was (55.33 ± 2.24) nmol/(g dw·min) and K m was (0.144 ± 0.011) mmol/L. Within 72 hr, S. polyrhiza decreased As concentration in the solution from 190 to 113 ng/mL with a removal rate of 41%. The study suggested that this floating aquatic plant has some potential for As phytofiltration in contaminated water bodies or paddy soils.
文摘对紫萍[Spirodela polyrhiza(Linn.) Schleid.]3个克隆和兰氏萍[Landoltia punctata(G. Meyer) Les et D. J. Crawford]3个克隆的所有克隆分株的单株叶状体数,单叶状体的根数、总根长和平均根长以及叶状体的长度和宽度进行分析,基于微卫星标记扩增结果对6个克隆在各微卫星位点的基因型进行分析,并对各微卫星位点与2种浮萍生长性状的关联性进行分析,还对2种浮萍各微卫星位点不同基因型间的生长性状进行多重比较。结果表明:紫萍单叶状体的根数、总根长和平均根长及叶状体宽度在3个克隆间以及兰氏萍各生长性状在3个克隆间均存在显著(P<0.05)差异。紫萍3个克隆在Sp25、Sp30、Sp47和Sp53位点的基因型不同,兰氏萍3个克隆在Sp10、Sp14、Sp16、Sp42、Sp47、Sp51、Sp52和Sp53位点的基因型不同;紫萍3个克隆在Sp6、Sp14、Sp16、Sp25、Sp36、Sp45、Sp47和Sp51位点的基因型和等位基因与兰氏萍不同;2种浮萍6个克隆在Sp4、Sp12、Sp28、Sp29和Sp43位点的基因型相同。Sp25、Sp30、Sp47和Sp53位点与紫萍单叶状体的根数、总根长和平均根长的关联性极显著(P<0.01),Sp30位点与其叶状体的长度和宽度的关联性显著,Sp25位点与其叶状体宽度的关联性也显著。Sp10、Sp14、Sp16、Sp42、Sp47、Sp52和Sp53位点与兰氏萍单株叶状体数和单叶状体根数的关联性极显著,Sp10、Sp14、Sp42、Sp47、Sp51、Sp52和Sp53位点与其叶状体的长度和宽度的关联性显著或极显著,Sp16、Sp51及Sp53位点与其单叶状体的总根长和平均根长的关联性极显著。Sp47和Sp53位点BD基因型紫萍的根明显偏多且偏长,Sp51和Sp53位点AD基因型兰氏萍的根明显偏长;并且,Sp25位点CE基因型紫萍的叶状体最多且最大,其根也最多且最长。研究结果显示:供试的微卫星标记具有属间标记通用性,可用于紫萍和兰氏萍基因型分析;Sp25、Sp30、Sp47和Sp53位点与紫萍根的长度和数量密切相关,而Sp10、Sp14、Sp16、Sp42、Sp47、Sp51、Sp52和Sp53位点与兰氏萍叶状体的数量和大小以及根的数量密切相关。