镉胁迫对旱柳矿质营养吸收的影响  

Effects of Cadmium Stress on Mineral Nutrient Uptake of Salix matsudana

作　　者：杨卫东[1] 陈益泰[1] 王树凤[1] 

机构地区：[1]中国林业科学研究院亚热带林业研究所,浙江富阳311400

出　　处：《林业科学研究》2009年第4期618-622,F0003,共6页Forest Research

基　　金：浙江省科技厅重大项目(2006C12065)资助

摘　　要：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.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（5μmol · 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.

关 键 词：旱柳 矿质营养 硝态氮 硝酸还原酶 

分 类 号：S718.43[农业科学—林学]