The two spectroscopically different short wavelength protochlorophyllide forms in pea epicotyls are both monomeric

B. Böddi, Katalin Kis-Petik, A. Kaposi, J. Fidy, Christer Sundqvist

Research output: Contribution to journalArticle

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Abstract

The spectral properties of the protochlorophyllide forms in the epicotyls of dark-grown pea seedlings have been studied in a temperature range, from 10 to 293 K with conventional fluorescence emission and excitation spectroscopy as well as by fluorescence line narrowing (FLN) at cryogenic temperatures. The conventional fluorescence techniques at lower temperatures revealed separate bands at 628, 634-636, 644 and 655 nm. At room temperature (293 K) the 628 and 634-636 nm emission bands strongly overlapped and the band shape was almost independent of the excitation wavelength. Under FLN conditions, vibronically resolved fluorescence spectra could be measured for the 628 and 634-636 nm bands. The high resolution of this technique excluded the excitonic nature of respective excited states and made it possible to determine the pure electronic (0,0) range of the spectra of the two components. Thus it was concluded that the 628 and 634-636 nm (0,0) emission bands originate from two monomeric forms of protochlorophyllide and the spectral difference is interpreted as a consequence of environmental effects of the surrounding matrix. On the basis of earlier results and the data presented here, a model is discussed in which the 636 nm form is considered as an enzyme-bound protochlorophyllide and the 628 nm form as a protochlorophyllide pool from which the substrate is replaced when the epicotyl is illuminated with continuous light. Copyright (C) 1998 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)531-540
Number of pages10
JournalBBA - Bioenergetics
Volume1365
Issue number3
DOIs
Publication statusPublished - Jul 20 1998

Fingerprint

Protochlorophyllide
Peas
Fluorescence
Wavelength
Temperature
Seedlings
Excited states
Cryogenics
Environmental impact
Spectrum Analysis
Spectroscopy
Light
Substrates
Enzymes

Keywords

  • Cryogenic temperature
  • Fluorescence
  • Fluorescence line narrowing
  • Inhomogeneous distribution function
  • Protochlorophyllide form

ASJC Scopus subject areas

  • Biophysics

Cite this

The two spectroscopically different short wavelength protochlorophyllide forms in pea epicotyls are both monomeric. / Böddi, B.; Kis-Petik, Katalin; Kaposi, A.; Fidy, J.; Sundqvist, Christer.

In: BBA - Bioenergetics, Vol. 1365, No. 3, 20.07.1998, p. 531-540.

Research output: Contribution to journalArticle

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AB - The spectral properties of the protochlorophyllide forms in the epicotyls of dark-grown pea seedlings have been studied in a temperature range, from 10 to 293 K with conventional fluorescence emission and excitation spectroscopy as well as by fluorescence line narrowing (FLN) at cryogenic temperatures. The conventional fluorescence techniques at lower temperatures revealed separate bands at 628, 634-636, 644 and 655 nm. At room temperature (293 K) the 628 and 634-636 nm emission bands strongly overlapped and the band shape was almost independent of the excitation wavelength. Under FLN conditions, vibronically resolved fluorescence spectra could be measured for the 628 and 634-636 nm bands. The high resolution of this technique excluded the excitonic nature of respective excited states and made it possible to determine the pure electronic (0,0) range of the spectra of the two components. Thus it was concluded that the 628 and 634-636 nm (0,0) emission bands originate from two monomeric forms of protochlorophyllide and the spectral difference is interpreted as a consequence of environmental effects of the surrounding matrix. On the basis of earlier results and the data presented here, a model is discussed in which the 636 nm form is considered as an enzyme-bound protochlorophyllide and the 628 nm form as a protochlorophyllide pool from which the substrate is replaced when the epicotyl is illuminated with continuous light. Copyright (C) 1998 Elsevier Science B.V.

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