TAILIEUCHUNG - Báo cáo lâm nghiệp: "Light-quality and -quantity effects on monoterpene-mediated photo-bleaching of conifer needles"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Light-quality and -quantity effects on monoterpene-mediated photo-bleaching of conifer needles. | 565s Ann. Sci. For. 1989 46 suppl. 565s-567s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Light-quality and -quantity effects on monoterpene-medi-ated photo-bleaching of conifer needles J. Franzen1 K. Gross2 M. Bonzon3 and E. Wagner1 Institutes of 1 Biology II and 2 Silviculture University of Freiburg . . and 3 Institute of Plant Physiology University of Geneva CH Switzerland Introduction In earlier publications Wagner et al. 1987 Gross et al. 1988 we showed that monoterpenes the characteristic products of secondary metabolism in conifers could play a role in forest decline. Monoterpenes are synthesized in leucoplasts at the basis of needles and are transported into resin ducts where they are kept strictly separated from the cytoplasm Carde et al. 1980 Gleizes ef al. 1983 . In a working hypothesis Wagner et al. 1987 we suggested that changes in membrane structure by air pollutants could liberate the monoterpenes from their storage compartments. In a kind of autocatalytic fashion the thus liberated monoterpenes can induce further changes in membrane structure which can influence the membrane-bound electron transport. The inhibition of respiration and photosynthesis by the monoterpene 3-pinene had been demonstrated earlier Douce et al. 1978 Pauly et al. 1981 . The inhibition of photosynthesis depends upon light intensity and probably results from an overproduction of oxygen free radicals due to monoterpene-mediated changes of membranes. The result is a photooxidative bleaching of the chloroplast pigments. In simulation experiments we demonstrated such monoterpene effects Gross et al. 1988 fumigation of spruce Picea abies L. Karst. seedlings and young plants with Tpinene resulted in a monoterpene concentration- and photofluencydependent destruction of chloroplast pigments resembling the phenomenon of montane yellowing . With the experiments presented here we investigate the influence of light quality on monoterpene-medi-ated photo-bleaching of .

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