Quantum yield and energy dependence for photooxidation of chlorophyllide in greening wheat [photodecomposition]
1981
Axelsson, L. (Goeteborg Univ. (Sweden). Dept. of Plant Physiology)
Dark grown leaves of wheat were irradiated with red light of different intensities, at a temperature close to 0 deg C. The rate of photoreduction of the protochlorophyllide 650-form into chlorophyllide 684-form was measured. On continued irradiation the chlorophyllide 684-form was photodecomposed. By comparing the rates of the two processes the quantum yield for photooxidation of the chlorophyllide 684-form was calculated. The quantum yield was 2.10('-5) at an intensity of 2200 W m('-2), and increased with decreasing light intensity to 3.2.10('-5) at an intensity of 170 W m('-2).
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