TAILIEUCHUNG - Báo cáo lâm nghiệp: "Seasonal variations in photosynthetic activity of spruces as determined by chlorophyll fluorescence"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Seasonal variations in photosynthetic activity of spruces as determined by chlorophyll fluorescence. | 483s Ann. Sci. For. 1989 46 suppl. 483s-489s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Seasonal variations in photosynthetic activity of spruces as determined by chlorophyll fluorescence . Lichtenthaler II. Rinderle and M. Haitz Botanisches Institut II Plant Physiology and Biochemistry University of Karlsruhe Kaiserstr. 12 D-7500 Karlsruhe . Introduction In photosynthetically active green plant tissue leaves needles the largest part of the light energy absorbed by the pigments chlorophylls carotenoids is used for photosynthesis photosynthetic quantum conversion . A minor part is re-emitted as chlorophyll fluorescence whose spectrum exhibits maxima near 690 and 735 nm Lichtenthaler et al. 1986 Lichtenthaler and Rinderle 1988a . The light-induced in vivo chlorophyll fluorescence of a predarkened green leaf or needle sample shows a transient which is known as fluorescence induction kinetics and variable fluorescence Kautsky effect . Upon illumination one observes a fast fluorescence rise ca 400 ms to a maximum fmax followed by a slow fluorescence decrease fd to the steady state fluorescence 4 . The fluorescence decrease ratio Rfd ffj fs Aid-values at 690 nm which indicates the potential photosynthetic activity of a leaf area has successfully been established as a very suitable vitality index and stress indicator in plants Lichtentha-ler and Rinderle 1988a b Lichtenthaler et al. 1986 Strasser et al. 1987 . The height of the Afd-values measured in the 690 and 730 nm regions reflects the potential photosynthetic activity of leaves as is demonstrated by parallel measurements of the net CO2-assimilation rate PN. The A d-values are an indicator of the intactness of the internal photosynthetic apparatus. Though they usually parallel the net CO2-assimilation rates they are a different parameter and independent of stomatai opening. With an additional apparatus the PAM fluorometer Schreiber et al. 1986 one can determine the photochemical Q- and the .

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