TAILIEUCHUNG - Báo cáo khoa học: "Light-dependent changes in the glutathione content Norway spruce (Picea abies (L.) Karst.)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Light-dependent changes in the glutathione content Norway spruce (Picea abies (L.) Karst.). | 837s Ann. Sci. For. 1989 46 suppl. 837S-841S Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Light-dependent changes in the glutathione content of Norway spruce Picea abies L. Karst. R. Schupp and H. Rennenberg Fraunhofer Institut fur Atmospharische Umweltforschung Kreuzeckbahnstr. 19 D-8100 Garmisch-Partenkirchen . Introduction The tripeptide glutathione is the most abundant low molecular weight thiol in higher plants Rennenberg 1982 . Its concentration on a cellular basis varies from to IĨ1M depending upon the plant species analyzed Rennenberg 1982 . Within a plant the concentration of glutathione is modified by developmental and environmental factors. In spruce needles the glutathione content undergoes seasonal changes with high concentrations in winter and early spring and low concentrations during the summer Ester-bauer and Grill 1978 . Decreasing concentrations of reduced glutathione are necessary to complete somatic embryo development in wild carrot suspension cultures Earnshaw and Johnson 1987 . When sulfur is present in excess the glutathione pool s of leaf cells can transiently be expanded de Kok et al. 1981 Ren-nenberg 1984 . In the presence of oxidants like sulfur dioxide or ozone in the atmosphere the pool s of glutathione in leaf cells may be depleted Wise and Naylor 1987 . One of the functions of glutathione in plants is its participation in the detoxification of harmful oxygen species Halliwell 1984 in the chloroplast. Glutathione acts in this organelle as an intermediate in the pathway of removal of superoxide radicals generated for example at light saturation of photosynthesis. As this function of glutathione is predominantly required at high light intensities it may be assumed that the glutathione content of leaf cells is likely to undergo diurnal changes. The present investigation with needles from spruce trees growing in the field was undertaken to test this assumption. Materials and Methods Plant material Experiments .

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