Effect of zinc on antioxidant response in maize (Zea mays L.) leaves.
Maize (Zea mays L. cv kanaujia) plants grown with Zn [10 (control), 0.1 (low) and 20 microM (high)], were investigated for concentration of antioxidants and activities of antioxidative enzymes in leaves. Young leaves of low Zn plants developed whitish-necrotic spots. Leaves of both low and high Zn plants showed decrease in chlorophyll concentration and accumulation of lipid peroxides, ascorbate and dehydroascorbate, associated with a decrease in the activity of ascorbate peroxidase and superoxide dismutase. Low and high Zn, however, showed diverse effect on glutathione reductase. While low Zn increased the activity of glutathione reductase, high Zn decreased its activity. Zinc effect on antioxidative constituents suggested Zn involvement in sustaining the antioxidative defense system in maize leaves.
Pandey
N
N
Botany Department, University of Lucknow, Lucknow 226 007, India.
Singh
A K
AK
Pathak
G C
GC
Sharma
C P
CP
D000975:Antioxidants / Q000378:metabolism*; D060387:Ascorbate Peroxidases; D001205:Ascorbic Acid / Q000378:metabolism; D002734:Chlorophyll / Q000378:metabolism; D003683:Dehydroascorbic Acid / Q000378:metabolism; D005980:Glutathione Reductase / Q000378:metabolism; D008054:Lipid Peroxides / Q000378:metabolism; D009336:Necrosis; D010544:Peroxidases / Q000378:metabolism; D018515:Plant Leaves / Q000201:enzymology; D013482:Superoxide Dismutase / Q000378:metabolism; D003313:Zea mays / Q000187:drug effects* / Q000378:metabolism; D015032:Zinc / Q000494:pharmacology*
D000975:Antioxidants; D008054:Lipid Peroxides; D002734:Chlorophyll; D010544:Peroxidases; D060387:Ascorbate Peroxidases; D013482:Superoxide Dismutase; D005980:Glutathione Reductase; D015032:Zinc; D001205:Ascorbic Acid; D003683:Dehydroascorbic Acid