Studies on light absorption and photochemical activity changes in chloroplast suspensions and leaves due to light scattering and light filtration across chloroplast and vegetation layers |
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Authors: | Flavio Massimo Garlaschi Giuseppe Zucchelli Robert Charles Jennings |
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Affiliation: | (1) Centro C.N.R. Biologia Cellulare e Molecolare delle Piante, Dipartimento di Biologia, Universitá di Milano, via Celoria 26, 20133 Milano, Italy |
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Abstract: | An experimental analysis is presented concerning the effect on relative light absorption by the two photosystems caused by (a) a highly light scattering environment (the detour effect) and (b) light filtration across successive chloroplast layers (the light attenuation effect). Both suspensions of isolated chloroplasts and leaves were employed.It is concluded that within a single spinach leaf these phenomena are likely to lead to only rather small increases in relative photosystem I absorption and activity with respect to photosystem II and will thus not exert a significant effect on non cyclic electron transport. On the contrary when light is filtrated across successive vegetation layers (shade light) significant increases in the relative PSI absorption and activity may be encountered.It is determined that the detour effect in mature leaves from a variety of plants increases overall photosynthetically useful light absorption by 35–40%.Abbreviations FM maximal fluorescence - LHCP2 light-harvesting chlorophyl a/b protein complex II - QA-primary quinone acceptor of photosystem II |
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Keywords: | chloroplasts detour effect leaves light absorption light filtration photosystems |
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