Abstract
Using a photoacoustic technique it has been possible to observe fast oxygen evolution and uptake transients at a high time resolution (approx. 0.2 s), when a dark-adapted leaf is reilluminated. There is initially a rapid pulse of oxygen evolution, correlated with the initial fluorescence rise (total duration under the experimental conditions used about 1–2 s), corresponding presumably to the photoreduction of the plastoquinone pool. This phenomenon may be utilized to calibrate the oxygen-evolution photoacoustic signal. The first pulse is followed by a series of slower bursts of oxygen uptake and evolution, reflecting various pools which are expressed following sequential activation of various parts of the photosynthetic apparatus, until achievement of a steady state.
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Abbreviations
- RuBP:
-
ribulose-1,5-bisphosphate
- PSI, PSII:
-
photosystems I, II
- Fo, Fm, F(t):
-
initial, maximum and instantaneous chlorophyll fluorescence emission
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Malkin, S. Fast photoacoustic transients from dark-adapted intact leaves: oxygen evolution and uptake pulses during photosynthetic induction — a phenomenology record. Planta 171, 65–72 (1987). https://doi.org/10.1007/BF00395068
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DOI: https://doi.org/10.1007/BF00395068