Biologia Plantarum

, Volume 54, Issue 3, pp 556–560 | Cite as

Fluoride affects distribution of absorbed excitation energy more in favour of photosystem 1

Brief Communication
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Abstract

The effects of fluoride on the photosynthetic electron transport chain have been studied in spinach thylakoid membranes. Inhibition in photosystem (PS) 2 electron transport rates and a subsequent increase in PS 1 electron transport rate indicated a possibility of state transitions being a mechanism of fluoride action. This hypothesis was further confirmed by the increase in fluorescence emission F735/685 at 77 K, a decrease in variable to maximum fluorescence ratio (Fv/Fm) at room temperature and increase in the absorption cross section of PS 1 suggesting that fluoride affects distribution of the excitation energy in favour of PS 1 at the expense of PS 2.

Additional key words

chlorophyll fluorescence Spinacea oleracea state transitions thylakoid membranes 

Abbreviations

Chl

chlorophyll

CP43, CP47

core antenna subunits of PS 2

DCMU

3-(3′,4′-dichlorophenyl)-1,1-dimethylurea

Fv

variable fluorescence

Fm

maximum fluorescence

Fj

fluorescence at the J step of OJIP curve

Tfm

time at which maximum fluorescence (Fm) is reached

PS

photosystem

P680

primary electron donor

QA, QB

plastoquinones

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Notes

Acknowledgements

Financial support from Department of Science and Technology (DST), India to AJ (Project: INT/ILTP/B-6.27) is thankfully acknowledged.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.School of Life SciencesDevi Ahilya UniversityIndoreIndia

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