摘要
考察了不同浓度[0(对照组)、0.25、0.50、1.50、2.50、5.00和10.00 mg/L]镉(Cd)对水浮莲(Pistia stratiotes L.)植株的生长和Cd积累的影响,同时分析了矿物质元素、叶绿素含量和超氧化物歧化酶(SOD)活性的变化情况。结果表明,经过31 d的培养,水浮莲的生长率与Cd的胁迫浓度呈极显著负相关(P<0.01,n=21),而含水率无显著差异(P>0.05,n=21)。Cd主要积累于水浮莲的根部,且地上部分和根部的Cd含量与Cd的胁迫浓度均呈极显著正相关(P<0.01,n=21)。此外,Cd胁迫促进了水浮莲对Cu、Zn、Mg和Fe的吸收,但是抑制了其对Ca的吸收,并且还抑制了水浮莲叶绿素的合成,降低了超氧化物歧化酶(SOD)的活性。与对照组相比,当Cd的胁迫浓度≥0.50 mg/L时,叶绿素a和b的含量均显著降低(P<0.05),当Cd的胁迫浓度≥1.50 mg/L,超氧化物歧化酶活性显著降低(P<0.05)。
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（P0.01,n=21） between the growth rate of Pistia stratiote L.and Cd stress concentration,but the moisture contents had no obvious difference（P0.05,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（P0.01,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（P0.05）,and the superoxide dismutase（SOD） activity was significantly decreased（P0.05） when Cd stress concentration was more than 1.50 mg / L.
出处
《湖北农业科学》
北大核心
2013年第18期4363-4367,共5页
Hubei Agricultural Sciences
基金
中央级公益性科研院所基本科研业务专项(206030201-21)
