Simple oscillations in photosynthesis of higher plants |
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Authors: | Teruo Ogawa |
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Institution: | Solar Energy Research Group, The Institute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama 351 Japan |
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Abstract: | Illumination of leaves of Vicia faba L. provoked oscillations in the rates of CO2 uptake and O2 evolution. The oscillations were marked under anaerobic conditions, but were absent at 20% O2. The minimum CO2 concentration required for the appearance of oscillations was 600 μl · l?1. The higher the CO2 concentration, the stronger the oscillations. The effect of CO2 concentration was saturated at 1000 μl CO2 · l?1. The period of the oscillations was 5–6 min at a light intensity of 80 nE · cm?2 · s?1 and became longer on lowering of the intensity. No oscillations appeared at intensities below 12 nE · cm?2 · s?1. Oscillations could also be generated by increasing the CO2 concentration in the atmosphere during strong illumination under anaerobic conditions. The chlorophyl a fluorescence yield showed oscillations, similar in shape and frequency to those of photosynthesis, after such an environmental change. Oscillations were also observed in photosynthesis of other C3 plants, Lycopersicon esulentum Mill and Glycine max Merrill, under the same conditions as those required for V. faba, but were absent for the C4 plants, Zea mays and Amaranthus retroflexus L. |
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Keywords: | Oscillation Chlorophyll fluorescence (Higher plant) Chl chlorophyll |
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