Pheophytin-mediated energy storage of photosystem II particles detected by photoacoustic spectroscopy

M. Fragata, R. Popovic, E. L. Camm, Roger Leblanc

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The photoacoustic (PA) characteristics (energy storage and heat dissipation) of photosystem II (PSII) core-enriched particles from barley were studied (i) in conditions where there was electron flow, i.e., in the presence of a combination of the electron acceptor K3 Fe (CN)6, referred to as FeCN, and the electron donor diphenylcarbazide (DPC), and (ii) in conditions where electron flow was suppressed, i.e., in the absence of FeCN and DPC. The experimental data show that a decrease of heat dissipation with a minimum at ∼ 540 nm can be interpreted as energy storage resulting from the presence of pheophytin (Pheo) in the PSII particles. On account of the capability of the PA method to measure the energy absorbed by the chromophores which is converted to heat, it is suggested that the PA detection of Pheo present in the PSII complex will permit to clarify the function of processes involving non-radiative relaxation of excited states in P680-Pheo-QA interactions.

Original languageEnglish
Pages (from-to)71-80
Number of pages10
JournalPhotosynthesis Research
Volume14
Issue number1
DOIs
StatePublished - Jan 1 1987
Externally publishedYes

Fingerprint

Pheophytins
photoacoustic spectroscopy
Photoacoustic spectroscopy
Photosystem II Protein Complex
photosystem II
Energy storage
Photoacoustic effect
Spectrum Analysis
Diphenylcarbazide
electrons
Electrons
Hot Temperature
energy
Heat losses
heat
Hordeum
Chromophores
Excited states
barley

Keywords

  • energy storage
  • P680-Pheo
  • pheophytin
  • photoacoustic spectroscopy
  • photosystem II
  • PSII particles

ASJC Scopus subject areas

  • Plant Science

Cite this

Pheophytin-mediated energy storage of photosystem II particles detected by photoacoustic spectroscopy. / Fragata, M.; Popovic, R.; Camm, E. L.; Leblanc, Roger.

In: Photosynthesis Research, Vol. 14, No. 1, 01.01.1987, p. 71-80.

Research output: Contribution to journalArticle

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