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B. NAGALAKSHMI, P. LATHA*, K.V. NAGA MADHURI AND V. UMAMAHESH
Department of Crop Physiology, S.V. Agricultural College, ANGRAU, Tirupati – 517 502, Chittoor Dt., Andhra Pradesh
A pot culture experiment was conducted at Regional Agricultural Research Station (RARS) farm, S.V. Agricultural College, Tirupati campus of Acharya N .G. Ranga Agricultural University, during kharif, 2016 with factorial RBD design involving normal and calcareous soil. Twenty groundnut genotypes were tested for iron deficiency chlorosis tolerance at three (30, 60 and 90 DAS) different stages of growth. Enzymatic activities of certain antioxidant enzymes such as superoxide dismutase, peroxi-dase and catalase were altered under iron deficiency stress conditions. The results revealed that iron efficient groundnut geno-types had higher peroxidase and catalase activity and higher active iron content than inefficient groundnut genotypes. Among the antioxidant enzymes, super oxide dismutase activity was high under iron deficiency stress conditions. Significant decrease in peroxidase and catalase activity was observed at later growth stages due to increase in iron deficiency as was evident by decrease in active iron content. There was a strong and positive correlation between leaf peroxidase activity and leaf ferrous iron content.
Iron deficiency chlorosis (IDC), active iron, peroxidase, catalase and superoxide dismutase.