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pubmed-article:9729605pubmed:abstractTextCyanobacteria are ecologically important photosynthetic prokaryotes that also serve as popular model organisms for studies of photosynthesis and gene regulation. Both molecular and ecological studies of cyanobacteria benefit from real-time information on photosynthesis and acclimation. Monitoring in vivo chlorophyll fluorescence can provide noninvasive measures of photosynthetic physiology in a wide range of cyanobacteria and cyanolichens and requires only small samples. Cyanobacterial fluorescence patterns are distinct from those of plants, because of key structural and functional properties of cyanobacteria. These include significant fluorescence emission from the light-harvesting phycobiliproteins; large and rapid changes in fluorescence yield (state transitions) which depend on metabolic and environmental conditions; and flexible, overlapping respiratory and photosynthetic electron transport chains. The fluorescence parameters FV/FM, FV'/FM',qp,qN, NPQ, and phiPS II were originally developed to extract information from the fluorescence signals of higher plants. In this review, we consider how the special properties of cyanobacteria can be accommodated and used to extract biologically useful information from cyanobacterial in vivo chlorophyll fluorescence signals. We describe how the pattern of fluorescence yield versus light intensity can be used to predict the acclimated light level for a cyanobacterial population, giving information valuable for both laboratory and field studies of acclimation processes. The size of the change in fluorescence yield during dark-to-light transitions can provide information on respiration and the iron status of the cyanobacteria. Finally, fluorescence parameters can be used to estimate the electron transport rate at the acclimated growth light intensity.lld:pubmed
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pubmed-article:9729605pubmed:authorpubmed-author:CampbellDDlld:pubmed
pubmed-article:9729605pubmed:authorpubmed-author:ClarkeA KAKlld:pubmed
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pubmed-article:9729605pubmed:dateRevised2010-9-13lld:pubmed
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pubmed-article:9729605pubmed:articleTitleChlorophyll fluorescence analysis of cyanobacterial photosynthesis and acclimation.lld:pubmed
pubmed-article:9729605pubmed:affiliationDepartment of Biology, Mount Allison University, Sackville, New Brunswick E4L 1G7, Canada. dcampbell@mta.calld:pubmed
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