Hg harm on cell membrane of rape leaf and cell endogenous protection effect

Abstract

Abstract: In this paper, the harm effect of different HgCl₂ concentrations on rape seedlings cultivated in sand for 50 days were studied.The results showed that the structure and function of leaf cell membrane, and the cell endogenous protection system had no measurable changes when the concentration of Hg was 0.5mg·L^-1 .But, when the Hg concentration was higher than 1mg · L^-1, the membrane lipid peroxidation was quickened, membrane structure was harmed, and the permeability of membrane was increased.At the concentration of 1～10mg Hg·L^-1, the soluble protein content of leaf was increased, the activities of SOD, PODand CATwere accelerated in varying degrees, and the cells presented a positive endogenous protection effect.At 50mg Hg·L^-1, the soluble protein content was decreased, the activities of SOD, PODand CATwent down steadily, and the positive protection effect disappeared.It is suggested that only within a certain limit, the cell endogenous protection system had a positive protection effect.

Key words: Hg, Rape, Leaf, Cell membrane, Protective enzymes

Ma Chengcang . Hg harm on cell membrane of rape leaf and cell endogenous protection effect[J]. Chinese Journal of Applied Ecology, 1998, 9(3): 323-326.

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