Water deficit-induced oxidative stress and the activation of antioxidant enzymes in white clover leaves
2009
Lee, B.R.,Chonnam National Univ., Gwangju (South Korea). Dept. of Animal Science | Li, L.S.,Chonnam National Univ., Gwangju (South Korea). Dept. of Animal Science | Jung, W.J.,Chonnam National Univ., Gwangju (South Korea). Dept. of Biological and Environmental Chemistry | Jin, Y.L.,Qingdao Agricultural Univ. (China). Coll. of Plant Protection | Avice, J.C.,Universite de Caen (France). Inst. de Biologie Fondamentale et Appliquee | Ourry, A.,Universite de Caen (France). Inst. de Biologie Fondamentale et Appliquee | Kim, T.H.,Chonnam National Univ., Gwangju (South Korea). Dept. of Animal Science
The objective of this study was to determine the development of the antioxidant enzymes induced by drought stress in white clover leaves. Water stress was imposed during 28 d by decreasing the daily irrigation. Leaf water potential gradually decreased from -0.46 to -2.33 MPa. For the first 7 d, dry mass (DM), H2O2 and lipid peroxidation were not significantly affected by water deficit. From 14 d of treatment, water stress decreased dry mass and increased the concentration of reactive oxygen species and oxidative stress (malondialdehyde content). The ascorbate peroxidase was activated most rapidly, already during the first week of water stress, but then its activity slowly decreased. Superoxide dismutase and catalase were activated by water deficit during 14 d and then their activities remained on a similar level. The activity of guaiacol-peroxidase increased mostly under progressive water stress. It was correlated with the increase in lipid peroxidation and growth restriction.
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