TY  - SER
AU  - Ibrahim,M.M.
TI  - Oxidative metabolism dysfunction caused by cadmium in zea mays L.seedings
KW  - Corn
KW  - Growth
KW  - Oxidative stress
KW  - Soils
KW  - Cadmium content
N1  - Includes references
N2  - Changes in growth, photosynthetic activity and antioxidant efficiency were investigated in leaves and roots of Zea mays L plants treated with Cdz+ in order to investigate whether Cd2+ induces common plant defense pathways like other biotic or abiotic environmental stresses or unspecific cellular degradation processes. It was found that growth of both shoots and roots and leaf area were significantly reduced in the presence of Cdz+, particularly at high concentrations (100µM). The contents of total chlorophyll (a+b) and carotenoids were decreased, with a higher magnitude at high concentration of Cdz+ where a sharp decline in these contents was observed. Furthermore, an alteration in activated oxygen species was also detected, as evidenced by reduction in sulfhydryl groups and increased lipid peroxidation as indicated by accumulation of malondialdehyde (MDA). A decrease in the non enzymatic antioxidant glutathione and GSH/GSSG ratio and enhanced accumulation of H2O2 were also observed. The results obtained with antioxidant enzymes further showed that SOD, CAT, APX and GPX activities were increased slightly at low concentrations of Cd2+ but were rapidly enhanced in response to moderate concentration, particularly (20 )lM) , indicating the capacity of Zea mays L. plant to scavenge O.z- and H2O2 , respectively. A progressive increase of ceIl death in roots and accumulation of soluble phenolics were also concomitant with increase in Cd2+ concentration
UR  - http://nile.enal.sci.eg/EALE/4606/0/29.pdf
ER  -