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The action of 2, 21 and 100% of oxygen on primary photochemistry of photosystem II (PS II), biosynthesis of pigments and carbon dioxide fixation by etiolated bean leaves during greening

Published online by Cambridge University Press:  05 December 2011

B. Wróblewska ,
M. Siedlecka  and
J. W. Poskuta
B. Wróblewska
Affiliation:
Department of Plant Physiology II, University of Warsaw, Krakowskie Przedmieście 26/28, 00–927 Warszawa, Poland
M. Siedlecka
Affiliation:
Department of Plant Physiology II, University of Warsaw, Krakowskie Przedmieście 26/28, 00–927 Warszawa, Poland
J. W. Poskuta
Affiliation:
Department of Plant Physiology II, University of Warsaw, Krakowskie Przedmieście 26/28, 00–927 Warszawa, Poland
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Synopsis

The responses of photosynthesis to oxygen concentration 2, 21 and 100% by etiolated bean leaves upon illumination were determined. After 0.3, 3, 6, 10, 12 and 24 h of greening the following processes were measured. (1) Functioning of PS II as reflected by changes in Fv/Fm ratios and t1/2 values. (2) Content and composition of pigments. (3) Capacity for carbon dioxide assimilation. The results showed that O2 exerts a complex inhibitory action on examined processes. The magnitudes of inhibition increased with increasing of O2 concentration and time of its action. Under applied conditions the lag phase for development of examined processes (with the exception of carotenoids) was in the range 3-10 h. After 24 h of greening in 2, 21 and 100% of O2 the Fy/Fm ratios attained values 0.55, 0.45, 0.13 respectively as compared with typical 0.80 of normal green leaves of bean. After 24 h of greening the inhibition by 100% O2 as compared with zero inhibition by 2% O2 were, in percentages: Fw/Fm, 78; t1/2, 77; chlorophyll a, 59; chlorophyll b, 69; β-carotene, 78; neoxanthin, 60; zeaxanthin, 43; violaxanthin, 35; CO2 fixation, 95.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh, Section B: Biological Sciences , Volume 102: Oxygen and Environmental Stress in Plants , 1994 , pp. 75 - 80
Copyright
Copyright © Royal Society of Edinburgh 1994

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