Effect of cadmium(Cd) on the uptake of mineral nutrient in Salit matsudana was investigated in hydroponic culture with different Cd treatments(0,5,25,50 μmol·L-1) for 14 d.Cd treatment did not significantly affe...Effect of cadmium(Cd) on the uptake of mineral nutrient in Salit matsudana was investigated in hydroponic culture with different Cd treatments(0,5,25,50 μmol·L-1) for 14 d.Cd treatment did not significantly affect K uptake in roots,in leaves,K content was increased by 5 μmol·L-1 Cd,however,no significant change was observed when treated with 25-50 μmol·L-1 Cd.In contrast,P uptake in roots was inhibited at all Cd levels,P content in leaves was decreased by 25-50 μmol·L-1 Cd.Ammonium content was elevated in roots but decreased in leaves under all Cd treatments.Nitrate content of roots and leaves showed a slight increase compared with the control.In roots,low Cd(5 μmol·L-1) enhanced the increase in NR activity,but didn’t markedly change at 25-50 μmol·L-1 Cd,NR activity of leaves was reduced in all Cd levels compared to the control.Concentrations of Zn and Mn in roots and leaves decreased with the increase of Cd in the medium,Fe concentration in roots was reduced by Cd,but translocation of Fe from roots to leaves increased in high level of Cd,Cu content was little influenced by Cd.These results suggested that Cd toxicity led to disruption of mineral nutrient uptake in S.matsudana.展开更多
文摘Effect of cadmium(Cd) on the uptake of mineral nutrient in Salit matsudana was investigated in hydroponic culture with different Cd treatments(0,5,25,50 μmol·L-1) for 14 d.Cd treatment did not significantly affect K uptake in roots,in leaves,K content was increased by 5 μmol·L-1 Cd,however,no significant change was observed when treated with 25-50 μmol·L-1 Cd.In contrast,P uptake in roots was inhibited at all Cd levels,P content in leaves was decreased by 25-50 μmol·L-1 Cd.Ammonium content was elevated in roots but decreased in leaves under all Cd treatments.Nitrate content of roots and leaves showed a slight increase compared with the control.In roots,low Cd(5 μmol·L-1) enhanced the increase in NR activity,but didn’t markedly change at 25-50 μmol·L-1 Cd,NR activity of leaves was reduced in all Cd levels compared to the control.Concentrations of Zn and Mn in roots and leaves decreased with the increase of Cd in the medium,Fe concentration in roots was reduced by Cd,but translocation of Fe from roots to leaves increased in high level of Cd,Cu content was little influenced by Cd.These results suggested that Cd toxicity led to disruption of mineral nutrient uptake in S.matsudana.
