Effects of single and combined pollution of uranium and cadmium on growth and physiological characteristics of Oenanthe javanica
The growth, chlorophyll content, root activity, cell membrane permeability and MDA content of Oenanthe javanica(Blume)DC were studied under uranium(U)and cadmium(Cd)alone and in combination in pot experiment. Results showed that U and Cd stresses sig-nificantly inhibited the growth of O. javanica(P<0.05)when compared with the control. The inhibition increased with increasing concentra-tions of U and Cd. The chlorophyll content of O. javanica decreased remarkably under U and Cd stresses. Cadmium reduced the content of chlorophyll b of O. javanica more significantly than U did. The activity of O. javanica roots was enhanced by low concentrations(15 mg·kg-1) of U and Cd, but significantly inhibited at high concentrations(150 mg·kg-1). The relative electrical conductivities of leaves were higher under U and Cd stresses than under CK, with U showing greater effect than Cd. Leaf MDA content increased as U and Cd concentrations in-creased. Combined applications of U and Cd(U150 mg·kg-1+Cd 150 mg·kg-1)had greater influences on O. javanica’s growth and physio-logical characteristics than their single. The present findings showed that O javanica has high resistance to U and Cd, which has potential to remediate U and Cd single and combined pollution soils.
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