Short flashes and continuous light have similar photoinhibitory efficiency in intact leaves.

Journal of Experimental Botany
Päivi SarvikasEsa Tyystjärvi

Abstract

Lincomycin-treated pumpkin leaves were illuminated with either continuous light or saturating single-turnover xenon flashes to study the dependence of photoinactivation of photosystem II (PSII) on the mode of delivery of light. The flash energy and the time interval between the flashes were varied between the experiments, and photoinactivation was measured with oxygen evolution and the ratio of variable to maximum fluorescence (F(v)/F(m)). The photoinhibitory efficiency of saturating xenon flashes was found to be directly proportional to flash energy and independent of the time interval between the flashes. These findings indicate that a low-light-specific mechanism, based on charge recombination between PSII electron acceptors and the oxygen-evolving complex, is not the main cause of photoinactivation caused by short flashes in vivo. Furthermore, the relationship between the rate constant of photoinactivation and photon flux density was similar for flashes and continuous light when F(v)/F(m) was used to quantify photoinactivation, suggesting that continuous-light photoinactivation has a mechanism in which the quantum yield does not depend on the mode of delivery of light. A similar quantum yield of photoinhibition for flashes ...Continue Reading

References

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Jul 29, 2005·Photosynthesis Research·András SzilárdImre Vass
Jul 29, 2005·Photosynthesis Research·Esa TyystjärviPäivi Sarvikas

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Citations

May 29, 2014·Journal of Experimental Botany·Albert Porcar-CastellJoseph A Berry
Feb 14, 2012·Journal of Theoretical Biology·Ioannis A PapadakisKonstadia Lika
Sep 30, 2010·Physiologia Plantarum·Anja Krieger-LiszkayEva Hideg
Dec 7, 2010·Biochimica Et Biophysica Acta·Marja Hakala-Yatkin, Esa Tyystjärvi
Nov 16, 2010·Biochimica Et Biophysica Acta·Shuhei InoueYoshitaka Nishiyama
May 14, 2011·Biochimica Et Biophysica Acta·Douglas A Campbell, Esa Tyystjärvi
May 14, 2011·Biochimica Et Biophysica Acta·Imre Vass
Feb 4, 2011·Physiologia Plantarum·Marja Hakala-YatkinEsa Tyystjärvi
Jan 15, 2021·Journal of Theoretical Biology·João Serôdio, Douglas A Campbell

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Methods Mentioned

BETA
confocal microscopy

Software Mentioned

Zeiss LSM Image Browser
SPSS

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