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Physiological Responses of Ageratum conyzoides to Lead Stress in Soil(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2011 05
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Physiological Responses of Ageratum conyzoides to Lead Stress in Soil
LIU BiyingPAN YuanzhiZHAO YangdiCAI LeiYANG HuiHOU YanZHANG Jianfang
(College of Landscape Architecture, Sichuan Agricultural University, Chengdu 611130, China)
lead stress Ageratum conyzoides physiological response SOD POD CAT

In order to understand the effects of increasing lead (Pb) contamination in soil on understory plant in urban forest, a pot experiment was conducted to study the physio-ecological effects of Pb stress in soil on the leaves of Ageratum conyzoides. All the treatments with different Pb concentrations decreased the concentrations of total chlorophyll and chlorophyll a and b, but increased the concentrations of cytomembrane permeability and malondialdehyde (MDA) in the leaves. The activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) were higher until the Pb concentration in soil reached 750 mg kg-1 or 1 000 mg kg-1, and thereafter decreased. As the soil Pb treatments proceeded, the SOD activities on day 20, 40 and 60 were higher than that on day 7, while the activities of POD and CAT decreased sharply after 20 d and 60 d, respectively. These results implied that A. conyzoides could adapt to the Pb-contaminated soil to a certain extent, but higher Pb stress in soil would damage its physiological processes. Fig 4, Ref 20


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Last Update: 2011-10-25