Estimation of the activation energy for millisecond delayed fluorescence from uncoupled chloroplasts

Hipkins, M.F.; Barber, James

doi:10.1016/0014-5793(74)80748-9

Cited by 15 publications

(5 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the contrary, DF has components that decay in very different time domains: in the nanoseconds (Christen et al 2000), microseconds (Jursinic and Govindjee 1977;Jursinic et al 1978;Wong et al 1978;Christen et al 1998;Mimuro et al 2007;Buchta et al 2008), milliseconds (Hipkins and Barber 1974;Barber and Neumann 1974;Zaharieva and Goltsev 2003;Goltsev et al 2005;Buchta et al 2007), seconds Hideg et al 1991;Katsumata et al 2008), and even in the hour time range (Hideg et al 1990).…”

Section: Origin Of Delayed Fluorescencementioning

confidence: 96%

“…The observed DF was characteristic of different photosynthesizing samples used-leaves (Strehler and Arnold 1951), chloroplasts and photosynthesizing bacteria (Arnold and Thompson 1956). For more than half a century this amazing property of photosynthetic systems has attracted the interest of many researchers (see e.g., Shuvalov and Litvin 1969;Barber and Kraan 1970;Wraight and Crofts 1971;Itoh and Murata 1973;Hipkins and Barber 1974;Jursinic andGovindjee 1977, 1982;Malkin and Barber 1978;Grabolle and Dau 2005). Several outstanding reviews have appeared that discuss the internal relationship between DF and the storage of light energy in photosynthesis (see, e.g., Lavorel 1975;Amesz and Van Gorkom 1978;Malkin 1979;Jursinic 1986;Veselovskii and Veselova 1990;Gaevsky and Morgun 1993;Radenovic et al 1994;Tyystjarvi and Vass 2004).…”

mentioning

confidence: 95%

See 1 more Smart Citation

Delayed fluorescence in photosynthesis

et al. 2009

View full text Add to dashboard Cite

Photosynthesis is a very efficient photochemical process. Nevertheless, plants emit some of the absorbed energy as light quanta. This luminescence is emitted, predominantly, by excited chlorophyll a molecules in the light-harvesting antenna, associated with Photosystem II (PS II) reaction centers. The emission that occurs before the utilization of the excitation energy in the primary photochemical reaction is called prompt fluorescence. Light emission can also be observed from repopulated excited chlorophylls as a result of recombination of the charge pairs. In this case, some time-dependent redox reactions occur before the excitation of the chlorophyll. This delays the light emission and provides the name for this phenomenon-delayed fluorescence (DF), or delayed light emission (DLE). The DF intensity is a decreasing polyphasic function of the time after illumination, which reflects the kinetics of electron transport reactions both on the (electron) donor and the (electron) acceptor sides of PS II. Two main experimental approaches are used for DF measurements: (a) recording of the DF decay in the dark after a single turnover flash or after continuous light excitation and (b) recording of the DF intensity during light adaptation of the photosynthesizing samples (induction curves), following a period of darkness. In this paper we review historical data on DF research and recent advances in the understanding of the relation between the delayed fluorescence and specific reactions in PS II. An experimental method for simultaneous recording of the induction transients of prompt and delayed chlorophyll fluorescence and decay curves of DF in the millisecond time domain is discussed.

show abstract

Section: Origin Of Delayed Fluorescencementioning

confidence: 96%

mentioning

confidence: 95%

Delayed fluorescence in photosynthesis

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Even after reaching the F m level, subsequent changes in fluorescence yield occurred due to other phenomena associated with membrane gradients ( pH; Wraight and Crofts 1970) or state-transitions (Bonaventura and Myers 1969); see also Allen (2002). It was therefore important that my quantitative analyses of delayed fluorescence took into account changes in fluorescence yield (Hipkins and Barber 1974;Barber et al 1977b). Because of this I became aware of the large changes in the F m level that could be induced with isolated thylakoid membranes by changing the salt levels of the suspension medium.…”

Section: Prompt Chlorophyll Fluorescencementioning

confidence: 99%

Engine of Life and Big Bang of Evolution: A Personal Perspective

Barber

2004

Photosynthesis Research

View full text Add to dashboard Cite

Photosystem II (PS II) is the engine for essentially all life on our planet and its beginning 2.5 billion years ago was the 'big bang of evolution.' It produces reducing equivalents for making organic compounds on an enormous scale and at the same time provides us with an oxygenic atmosphere and protection against UV radiation (in the form of the ozone layer). In 1967, when I began my career in photosynthesis research, little was known about PS II. The Z-scheme had been formulated [Hill and Bendall (1960) Nature 186: 136-137] and Boardman and Anderson [(1964) Nature 203: 166-167] had isolated PS II as a discrete biochemical entity. PS II was known not only to be the source of oxygen but of variable chlorophyll fluorescence [Duysens and Sweers (1963) In: Studies on Microalgae and Photosynthetic Bacteria, pp. 353-372. University of Tokyo Press, Tokyo] and delayed chlorophyll fluorescence [Arnold and Davidson (1954) J Gen Physiol 37: 677-684]. P680 had just been discovered [Döring et al. (1967) Z Naturforsch 22b: 639-644]. No wonder the 'black box of PS II' was described at that time by Bessel Kok and George Cheniae [Current Topics in Bioenergetics 1: 1-47 (1966)] as the 'inner sanctum of photosynthesis.' What a change in our level of understanding of PS II since then! The contributions of many talented scientists have unraveled the mechanisms and structural basis of PS II function and we are now very close to revealing the molecular details of the remarkable and thermodynamically demanding reaction which it catalyzes, namely the splitting of water into its elemental constituents. It has been a privilege to be involved in this journey.

show abstract

“…Studies by Barber and Kraan (1970)) Barber and Varley (1972) and Barber (1974, see Hipkins andBarber (1974)) have shown that not only does temperature accelerate the back-reaction but also the emission can be enhanced by the generation of an electrical potential gradient across the thylakoid membrane. The electrical gradients were produced by creating a K+ diffusion potential which stimulated the emission intensity.…”

Section: Delayed Light Emissionmentioning

confidence: 99%