Abstract
Drought brings about different biochemical responses in plants in order to minimize its deleterious effects. Drought induces an oxidative stress in Lotus corniculatus leaves, measured as an increment in lipid membrane peroxidation and in situ detected superoxide. As a result, total superoxide dismutase (SOD: E.C. 1.15.1.1) activity increases after a 4-h drought, when the hydric potential has decreased to −0.77 MPa. Assays with specific inhibitors suggest the presence of MnSOD, Cu/ZnSOD and FeSOD activity in L. corniculatus plants, contribute 60, 30 and 10% of total SOD activity, respectively. The Cu/ZnSOD isoform proved to be the most responsive to drought showing a remarkable increase in its activity as that corresponds to the induction of three different isoenzymes. Expression analysis of SOD isoforms revealed an increase in Cu/ZnSOD transcripts with a maximum accumulation 4 h after drought imposition. The possible role of SOD enzymes as an antioxidant protector system under water stress conditions in L. corniculatus is discussed.
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