Delayed fluorescence as a direct indicator of diurnal variation in quantum and radiant energy utilization efficiencies of phytoplankton |
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Authors: | E Kurzbaum W Eckert Y Z Yacobi |
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Institution: | (1) Department of Plant Sciences, Tel Aviv University, Tel Aviv, 69978, Israel;(2) The Yigal Allon Kinneret Limnological Laboratory, Israel Oceanographic and Limnological Research, Migdal, 14950, Israel |
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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 (r
2 = 0.869, p<0.01) and Ψ (r
2 = 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. |
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Keywords: | Chlorella chlorophyll index of radiant energy utilization efficiency (Ψ ) photosynthesis |
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