Comparison of Methods to Estimate Dark Respiration in the Light in Leaves of Two Woody Species.
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Values of the CO2 photocompensation point, at which the rate of photosynthetic CO2 uptake equaled that of photorespiratory CO2 evolution, were very constant, suggesting an excellent consistency in the results obtained with the Laisk approach.Abstract:
Dark respiration in the light was estimated in leaves of two woody species (Heteromeles arbutifolia Ait. and Lepechinia fragans Greene) using two different approaches based on gas-exchange techniques: the Kok method and the Laisk method. In all cases, dark respiration in the light was lower (P < 0.05) than respiration in darkness, indicating that dark respiration was inhibited in the light. Rates of dark respiration in the light estimated by the Laisk method were 52% higher (P < 0.05) than those estimated by the Kok method. Differences between the methods could be explained by the low ambient CO2 concentrations required by the Laisk approach. The mean value of the inhibition of respiration by light for the two species, corrected for the ambient CO2 concentration effect, was 55%. Despite the differences in leaf characteristics between the species, values of the CO2 photocompensation point, at which the rate of photosynthetic CO2 uptake equaled that of photorespiratory CO2 evolution, were very constant, suggesting an excellent consistency in the results obtained with the Laisk approach.read more
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References
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Book ChapterDOI
Modelling of Photosynthetic Response to Environmental Conditions
TL;DR: In this article, the rate of ribulose bisphosphate (RuP2)-saturated carboxylation, the ratio of photorespiration to carbon dioxide, and the rates of electron transport/photophosphorylation and of “dark” respiration in the light.
Journal ArticleDOI
Effect of temperature on the CO2/O 2 specificity of ribulose-1,5-bisphosphate carboxylase/oxygenase and the rate of respiration in the light : Estimates from gas-exchange measurements on spinach.
A. Brooks,Graham D. Farquhar +1 more
TL;DR: Temperature effects on the ratio of photorespiration to photosynthesis were not solely the consequence of differential effects of temperature on the solubilities of CO2 and O2 and the CO2/O2 specificity decreased with increasing temperature.
Journal ArticleDOI
Species variation in the specificity of ribulose biphosphate carboxylase/oxygenase
TL;DR: From analyses of RuBP carboxylase/oxygenase enzymes purified from several different species, large differences in specificity towards the substrates CO2 and O2 are reported.
Journal ArticleDOI
Effect of Photosynthesis and Carbohydrate Status on Respiratory Rates and the Involvement of the Alternative Pathway in Leaf Respiration
TL;DR: It is concluded that the level of respiratory substrate in leaves determines their rate of O(2) uptake, and the degree to which the alternative path contributes to that O( 2) uptake is determined.
Journal ArticleDOI
Kok effect and the quantum yield of photosynthesis : light partially inhibits dark respiration.
TL;DR: The Kok effect was observed at saturating pCO(2) and, therefore, could not be explained by a change in photorespiration and was minimized when dark respiration was minimized, indicating that a partial suppression ofdark respiration by light is responsible.
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