Abstract
We measured the light response curve of photosynthetic oxygen evolution by illuminating a leaf disc in an air-tight windowed chamber. Oxygen production was measured by monitoring the quenching of luminescence of an organometallic ruthenium compound. A photodiode based chlorophyll a fluorometer was used to measure the luminescence intensity. Oxygen evolution measurements with a traditional oxygen electrode gave the same numerical values at different light intensities when the same leaf disk was tested. The quality of the measurement signal of the new method was found to be similar to that obtained with the oxygen electrode method. The new luminescence based system is more stable against electrical disturbances than an oxygen electrode, its response to oxygen pressure changes is very rapid, and the new method allows the same basic equipment to be used for chlorophyll fluorescence and oxygen measurements.
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Tyystjärvi, E., Karunen, J. & Lemmetyinen, H. Measurement of photosynthetic oxygen evolution with a new type of oxygen sensor. Photosynthesis Research 56, 223–227 (1998). https://doi.org/10.1023/A:1005994311121
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DOI: https://doi.org/10.1023/A:1005994311121