Abstract
Summary Two cultivars (frost resistant Sadovo 1 and frost susceptible San Pastore) of winter wheat (Triticum aestivum L.) were used to study the protective effect of molybdenum during freezing of plants grown on acid soil. We followed the effect of cold acclimation (2°C for 7 days) and freezing (−5 °C for 16 h) on the activities of nitrate reductase (NR), nitrite reductase (NiR) and glutamine synthetase (GS) in the leaves of both wheat cultivars grown on soil with pH 6.0 and pH 4.5. No difference was observed between the cultivars in the temperature induced changes of enzyme activities. During cold acclimation the activities of the three enzymes increased irrespective of the soil's pH; this increase, which was most pronounced for NADH: NR activity, was paralleled by an increase in NR protein. Freezing affected only NR activity in plants grown on acid soil; the sharpest decline was found for NADH : NR activity and FADH : NR partial activity. Molybdenum supplied to winter wheat cv. Sadovo 1 grown on soil with pH 4.5 prevented the frost-induced decline of NADH : NR activity. The possible mechanism of the protective effect is discussed.
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