Abstract
A newly developed compact instrument is described for the measurement of chlorophyll luminescence induction in plants. The instrument operates with a pulsed light emitting diode (LED) as light source and a photodiode as luminescence detector. A special emitter-detector geometry provides for high irradiance of the sample and efficient collection of luminescence by the detector. With insertion of appropriate filters the same probe is also suited for measuring prompt chlorophyll fluorescence. The instrument shows considerable flexibility with respect to pulse frequency, relative lengths of light/dark intervals and luminescence sampling periods. Due to a selective amplifier system only that part of luminescence is processed which is induced by the individual excitation pulses. By this approach, the problem of “slow phase accumulation”, encountered with conventional phosphoroscopes, is eliminated. Some examples are given for system operation, demonstrating satisfactory performance in measurements with intact leaves and isolated chloroplasts.
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Schreiber, U., Schliwa, U. A solid-state, portable instrument for measurement of chlorophyll luminescence induction in plants. Photosynth Res 11, 173–182 (1987). https://doi.org/10.1007/BF00018275
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DOI: https://doi.org/10.1007/BF00018275