PMID: 11607419Aug 15, 1993Paper

Insight into the relationship of chlorophyll a fluorescence yield to the concentration of its natural quenchers in oxygenic photosynthesis

Proceedings of the National Academy of Sciences of the United States of America
V P Shinkarev, Govindjee

Abstract

Fluorescence of chlorophyll a (Chla) is a noninvasive and very sensitive intrinsic probe of photosynthesis. It monitors the composition and organization of the photosystems, the exciton energy transfer, the photochemistry, and the effects of various types of stress on plants. It is the most used as well as the most abused tool in photosynthesis. Thus, an understanding of its relationship to photosynthesis has been of paramount importance. Both the oxidized primary plastoquinone, QA, and the oxidized primary reaction-center Chla, P680+ (for short, P+), are known to be quenchers of Chla fluorescence yield (phi f) of photosystem II. Flash-number dependence of Chla fluorescence yield shows either a period 4, due to the four-step charge-accumulation process of water oxidation (donor side), or period 2 behavior, due to the two-step reduction of the plastoquinone QB (acceptor side) of photosystem II reaction centers. We provide here a further insight into the relationship of variable Chla fluorescence yield (phi f) to the concentration of the two quenchers. The observed time dependence of the ratio of psi f after flash 3 to that after flash 1 (or flash 5) in spinach thylakoids at pH 6 can be explained if we suggest that 1/psi f approx...Continue Reading

References

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Citations

Aug 1, 2007·Photosynthesis Research·George C PapageorgiouKostas Stamatakis
Jul 20, 2012·Photosynthesis Research·Alexandrina Stirbet, Govindjee
Jun 10, 2014·Biochemistry. Biokhimii︠a︡·A Stirbet Govindjee
May 29, 2014·Journal of Experimental Botany·Albert Porcar-CastellJoseph A Berry
Aug 15, 2014·Photosynthesis Research·Hazem M KalajiMarek Zivcak
Oct 12, 2012·Bulletin of Environmental Contamination and Toxicology·Lixiao NiYiping Li
May 8, 2009·Journal of Photochemistry and Photobiology. B, Biology·Kolyo DankovEmilia L Apostolova
Feb 9, 2006·Journal of Photochemistry and Photobiology. B, Biology·Emilia L ApostolovaStefka G Taneva
Dec 29, 2000·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·K Oxborough, N R Baker
Oct 24, 2019·Annals of Botany·Alexandrina StirbetGovindjee Govindjee
Jul 16, 2019·Photosynthesis Research·Vasily V PtushenkoMikhail P Kirpichnikov
Apr 1, 2007·Functional Plant Biology : FPB·Dmytro Kornyeyev, Luke Hendrickson

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