Diurnal changes in the delayed fluorescence response of an ambient light-excited green alga

W. Eckert, F. Leunert, Y. Z. Yacobi, J. Köhler, E. Kurzbaum

Research output: Contribution to journalArticlepeer-review

Abstract

Delayed fluorescence (DF) is a characteristic feature of light-excited plant cells caused by the back-reaction of electrons through the electron transport chain. Targeting the response of light-adapted green algae to diurnal light changes, the present study presents novel results of DF measurements in the absence of an artificial excitation light source. Based on a linear relationship between the DF counts and light intensities from 0.15 to 0.65 W m–2 during daybreak, we estimated an initial algal response to light intensities of 0.01 W m–2. Dissolved oxygen concentrations began to increase at 1.0 W m–2. A noon depression similar to that reported for prompt fluorescence occurred above 100 W m–2. Our results from multiple day–night cycles emphasize that the DF response is a function of the chlorophyll concentration and of a rapid light adaptation. The DF counts alone cannot provide a reliable unambiguous measure of photosynthetic activity.

Original languageEnglish
Pages (from-to)40-46
Number of pages7
JournalPhotosynthetica
Volume57
Issue number1
DOIs
StatePublished - 2019

Bibliographical note

Funding Information:
The present study was supported research grant #: WT 1003/2264 from the German Federal Ministry of Education and Research (BMBF) and Israel Ministry of Science and Technology (MOST).

Funding Information:
Abbreviations: Chl – chlorophyll; DF – delayed fluorescence; DFI – delayed fluorescence integral; ETC – electron transport chain; n-DFI – normalized delayed fluorescence integral; PP – primary production. Acknowledgements: The present study was supported research grant #: WT 1003/2264 from the German Federal Ministry of Education and Research (BMBF) and Israel Ministry of Science and Technology (MOST).

Publisher Copyright:
© The authors.

Keywords

  • Additional Chlorella vulgaris
  • Chlorophyll fluorescence
  • Diurnal light cycle
  • Phytoplankton

ASJC Scopus subject areas

  • Physiology
  • Plant Science

Fingerprint

Dive into the research topics of 'Diurnal changes in the delayed fluorescence response of an ambient light-excited green alga'. Together they form a unique fingerprint.

Cite this