Post-illumination burst of carbon dioxide inPhaseolus vulgaris L. as affected by leaf temperature |
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Authors: | M. Kaše J. Čatský |
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Affiliation: | (1) Institute of Experimental Botany, Czechoslovak Academy of Sciences, Flemingovo n. 2, 160 00 Praha 6, Czechoslovakia |
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Abstract: | The effect of leaf temperature on the post-illumination burst of CO2 (PIB) in 15 day-old primary bean leaves (Phaseolus vulgaris L.) was studied by means of infrared gas analysis in a closed gas exchange system. The amplitude and kinetic of PIB was different with its own characteristic course for different temperature steps. The temperature optimum for the PIB at 21% O2 near the carbon dioxide compensation concentration Λ (150 mg m-3) was 33 °C while that for net photosynthetic rate (P N) at 21% O2 and 600 mg m-3 CO2 was 24.5 °C. The PIB was observed to 12…33 s after the darkening of leaves. No PIB was observed at 2% O2. The applicability of PIB as an estimate of photorespiration rateR p has been proved by comparing it with extrapolation of the relationship betweenP n and CO2 concentration to zero. |
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Keywords: | Dark respiration rate |
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