biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 42:409-415, 1999 | DOI: 10.1023/A:1002469303670

Effects of Salicylic Acid on Heavy Metal-Induced Membrane Deterioration Mediated by Lipoxygenase in Rice

A. Mishra1, M.A. Choudhuri1
1 Plant Physiology and Biochemistry Laboratory, Department of Botany, Burdwan University, Burdwan, India

Deterioration of membranes caused by lipoxygenase (LOX) activity under 10 µM PbCl2 or 10 µM HgCl2 was partially alleviated by the exogenous application of 100 µM salicylic acid (SA). In two cultivars of rice (Oryza sativa L. cvs. Ratna and IR 36), the presence of SA ameliorated the increased leakage of electrolytes, injury index, and the content of malondialdehyde caused by these heavy metals. Lead decreased H2O2 content whereas Hg increased it in both cultivars. Application of SA increased H2O2 in presence of Pb, while decreased it in presence of Hg. Both Pb and Hg decreased superoxide dismutase activity, while increased peroxidase activity. The activity of catalase was decreased by Hg but increased by Pb and SA reversed their effects. Thus, SA ameliorated the damaging effects of Pb and Hg on membranes.

Keywords: catalase; electrical conductivity; injury index; lead; lipid peroxidation; malondialdehyde; membrane permeability; mercury; Oryza sativa; peroxidase; superoxide dismutase
Subjects: catalase, heavy-metal induced membrane deterioration; cultivar differences, salicylic acid, heavy metals; heavy-metal induced membrane deterioration; injury index; lead, membrane deterioration; lipid peroxidation; lipoxygenase, heavy-metal induced membrane deterioration; malondialdehyde, heavy-metal induced membrane deterioration; membrane permeability, heavy-metal deterioration; mercury, heavy-metal induced membrane deterioration; Oryza sativa; peroxidase, heavy metals; salicylic acid, heavy-metals, membrane deterioration; superoxide dismutase, heavy metals

Published: November 1, 1999  Show citation

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Mishra, A., & Choudhuri, M.A. (1999). Effects of Salicylic Acid on Heavy Metal-Induced Membrane Deterioration Mediated by Lipoxygenase in Rice. Biologia plantarum42(3), 409-415. doi: 10.1023/A:1002469303670
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