V. Nenova et I. Stoyanov, PHYSIOLOGICAL AND BIOCHEMICAL-CHANGES IN YOUNG MAIZE PLANTS UNDER IRON-DEFICIENCY .2. CATALASE, PEROXIDASE, AND NITRATE REDUCTASE ACTIVITIES IN LEAVES, Journal of plant nutrition, 18(10), 1995, pp. 2081-2091
Young maize plants, grown hydroponically, were supplied with different
amounts (7.5, 0.75, 0.15, 0.075, and 0 mg Fe/L) of iron (Fe). At 14,
21, and 28 days, in vitro activities of catalase, peroxidase and nitra
te reductase in leaves were determined. Strong and complete Fe deficie
ncy resulted in decreased enzyme activities. Under moderate Fe deficie
ncy-often a restoration of the normal activity after an initial reduct
ion-was observed. The rapidity and the degree of reaction to Fe defici
ency depended on the enzyme. The ratio peroxydase/catalase activity ca
n not be applied as a reliable tool for diagnosis of Fe deficiency.