Effect of Cd Stress on Cd Accumulation and Physiological Characteristics of Pistia stratiotes L.
Under different concentrations(0,0.25,0.50,1.50,2.50,5.00 and 10.00 mg/L)of Cd stress,the growth and Cd accumulation of Pistia stratiotes L.were investigated,as well as the mineral elements,chlorophyll and superoxide dismutase (SOD) activity variations.The results showed that after 31 days of cultivation,there was a very significant negative correlation (P＜0.01,n=21) between the growth rate of Pistia stratiote L.and Cd stress concentration,but the moisture contents had no obvious difference(P＞0.05,n=21).Cd mostly accumulated in the root of Pistia stratiotes L.,and the Cd contents in aerial part and root of Pistia stratiotes L.showed very significant positive correlation (P＜0.01,n=21) with Cd stress concentration.In addition,Cd stress could promote Pistia stratiotes L.uptaking of Cu,Zn,Mg and Fe,but inhibit the uptaking of Ca and the synthesizing of chlorophyll,and could reduce the superoxide dismutase(SOD) activity of Pistia stratiotes L.Compared with the control group,when Cd stress concentration was more than 0.50 mg/L,the chlorophyll a and chlorophyll b contents were all significantly decreased (P＜0.05),and the superoxide dismutase (SOD) activity was significantly decreased (P＜0.05) when Cd stress concentration was more than 1.50 mg/L.
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NSTL
万方数据
维普
