Delayed fluorescence as a direct indicator of diurnal variation in quantum and radiant energy utilization efficiencies of phytoplankton

E. Kurzbaum; W. Eckert; Y. Z. Yacobi

doi:10.1007/s11099-007-0096-z

Delayed fluorescence as a direct indicator of diurnal variation in quantum and radiant energy utilization efficiencies of phytoplankton

E. Kurzbaum, W. Eckert, Y. Z. Yacobi

Research output: Contribution to journal › Article › peer-review

Abstract

We compared delayed fluorescence (DF) excitation spectrometry with radiocarbon (¹⁴C) technique using a monoalgal culture of Chlorella vulgaris grown under natural temperature and irradiance. This was done by monitoring the DF, in parallel to quantum efficiency (QE) and index of radiant energy utilization efficiency (Ψ) as calculated on the basis of carbon uptake measurements by radiocarbon technique. During the diurnal cycle, temperature, irradiance, and chlorophyll (Chl) contents were monitored in the algal culture that was kept in an open transparent plastic tank submerged at the surface of Lake Kinneret, Israel. The DF signal correlated with both the QE (r² = 0.869, p<0.01) and Ψ (r² = 0.977, p<0.01) during a diurnal cycle. We suggest that, besides the measurement of active Chl and phytoplankton population composition, the DF signal provides additional information on the QE and Ψ in phytoplankton population.

Original language	English
Pages (from-to)	562-567
Number of pages	6
Journal	Photosynthetica
Volume	45
Issue number	4
DOIs	https://doi.org/10.1007/s11099-007-0096-z
State	Published - Dec 2007
Externally published	Yes

Bibliographical note

Funding Information:
Received 30 January 2007, accepted 28 June 2007. ***Corresponding author; fax: 97246724627, e-mail: eyal3056@gmail.com Acknowledgements: This work was supported by the "Yoachai Ben Nun scholarship" from the Israel Oceanographic and Limnological Research Ltd. Technical assistance by V. Gerhardt and U. Bodemer is gratefully acknowledged. We acknowledge two anonymous reviewers whose remarks helped improving the clarity and quality of the presentation.

Keywords

Chlorella
Chlorophyll
Index of radiant energy utilization efficiency (Ψ)
Photosynthesis

ASJC Scopus subject areas

Physiology
Plant Science

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10.1007/s11099-007-0096-z

Cite this

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title = "Delayed fluorescence as a direct indicator of diurnal variation in quantum and radiant energy utilization efficiencies of phytoplankton",

abstract = "We compared delayed fluorescence (DF) excitation spectrometry with radiocarbon (14C) technique using a monoalgal culture of Chlorella vulgaris grown under natural temperature and irradiance. This was done by monitoring the DF, in parallel to quantum efficiency (QE) and index of radiant energy utilization efficiency (Ψ) as calculated on the basis of carbon uptake measurements by radiocarbon technique. During the diurnal cycle, temperature, irradiance, and chlorophyll (Chl) contents were monitored in the algal culture that was kept in an open transparent plastic tank submerged at the surface of Lake Kinneret, Israel. The DF signal correlated with both the QE (r2 = 0.869, p<0.01) and Ψ (r2 = 0.977, p<0.01) during a diurnal cycle. We suggest that, besides the measurement of active Chl and phytoplankton population composition, the DF signal provides additional information on the QE and Ψ in phytoplankton population.",

keywords = "Chlorella, Chlorophyll, Index of radiant energy utilization efficiency (Ψ), Photosynthesis",

author = "E. Kurzbaum and W. Eckert and Yacobi, {Y. Z.}",

note = "Funding Information: Received 30 January 2007, accepted 28 June 2007. ***Corresponding author; fax: 97246724627, e-mail: eyal3056@gmail.com Acknowledgements: This work was supported by the {"}Yoachai Ben Nun scholarship{"} from the Israel Oceanographic and Limnological Research Ltd. Technical assistance by V. Gerhardt and U. Bodemer is gratefully acknowledged. We acknowledge two anonymous reviewers whose remarks helped improving the clarity and quality of the presentation.",

year = "2007",

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doi = "10.1007/s11099-007-0096-z",

language = "English",

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T1 - Delayed fluorescence as a direct indicator of diurnal variation in quantum and radiant energy utilization efficiencies of phytoplankton

AU - Kurzbaum, E.

AU - Eckert, W.

AU - Yacobi, Y. Z.

N1 - Funding Information: Received 30 January 2007, accepted 28 June 2007. ***Corresponding author; fax: 97246724627, e-mail: eyal3056@gmail.com Acknowledgements: This work was supported by the "Yoachai Ben Nun scholarship" from the Israel Oceanographic and Limnological Research Ltd. Technical assistance by V. Gerhardt and U. Bodemer is gratefully acknowledged. We acknowledge two anonymous reviewers whose remarks helped improving the clarity and quality of the presentation.

PY - 2007/12

Y1 - 2007/12

N2 - We compared delayed fluorescence (DF) excitation spectrometry with radiocarbon (14C) technique using a monoalgal culture of Chlorella vulgaris grown under natural temperature and irradiance. This was done by monitoring the DF, in parallel to quantum efficiency (QE) and index of radiant energy utilization efficiency (Ψ) as calculated on the basis of carbon uptake measurements by radiocarbon technique. During the diurnal cycle, temperature, irradiance, and chlorophyll (Chl) contents were monitored in the algal culture that was kept in an open transparent plastic tank submerged at the surface of Lake Kinneret, Israel. The DF signal correlated with both the QE (r2 = 0.869, p<0.01) and Ψ (r2 = 0.977, p<0.01) during a diurnal cycle. We suggest that, besides the measurement of active Chl and phytoplankton population composition, the DF signal provides additional information on the QE and Ψ in phytoplankton population.

AB - We compared delayed fluorescence (DF) excitation spectrometry with radiocarbon (14C) technique using a monoalgal culture of Chlorella vulgaris grown under natural temperature and irradiance. This was done by monitoring the DF, in parallel to quantum efficiency (QE) and index of radiant energy utilization efficiency (Ψ) as calculated on the basis of carbon uptake measurements by radiocarbon technique. During the diurnal cycle, temperature, irradiance, and chlorophyll (Chl) contents were monitored in the algal culture that was kept in an open transparent plastic tank submerged at the surface of Lake Kinneret, Israel. The DF signal correlated with both the QE (r2 = 0.869, p<0.01) and Ψ (r2 = 0.977, p<0.01) during a diurnal cycle. We suggest that, besides the measurement of active Chl and phytoplankton population composition, the DF signal provides additional information on the QE and Ψ in phytoplankton population.

KW - Chlorella

KW - Chlorophyll

KW - Index of radiant energy utilization efficiency (Ψ)

KW - Photosynthesis

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Delayed fluorescence as a direct indicator of diurnal variation in quantum and radiant energy utilization efficiencies of phytoplankton

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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