Journal ArticleDOI
Estimating the rate of photorespiration in leaves
Reads0
Chats0
TLDR
The rate of photorespiration as a proportion of the rate of photosynthesis will fall to one half the current rate when the CO2 level in the atmosphere doubles.Abstract:
Photorespiration is the light-dependent evolution of CO2, which accompanies photosynthesis in C3plants. The four best known methods of measuring the rate of photorespiration have theoretical or technical problems, which make the results unreliable. However, the rate of photorespiration can be calculated from the rate of net CO2assimilation and the partial pressures of CO2and O2. Estimates of rates of photorespiration in the past and future can be made. The rate of photorespiration as a proportion of the rate of photosynthesis will fall to one half the current rate when the CO2level in the atmosphere doubles.read more
Citations
More filters
Journal ArticleDOI
The evolution of C4 photosynthesis
TL;DR: Gene duplication followed by neo- and nonfunctionalization are the leading mechanisms for creating C4 genomes, with selection for carbon conservation traits under conditions promoting high photorespiration being the ultimate factor behind the origin of C4 photosynthesis.
Journal ArticleDOI
The temperature response of C(3) and C(4) photosynthesis.
Rowan F. Sage,David S. Kubien +1 more
TL;DR: The temperature response of instantaneous net CO(2) assimilation rate (A) is described in terms of these limitations, and possible limitations on A at elevated temperatures arising from heat-induced lability of Rubisco activase are evaluated.
Journal ArticleDOI
Tansley Review No. 112
Christine H. Foyer,Graham Noctor +1 more
TL;DR: This review considers photosynthesis as a whole-cell process, in which O2 and AOS are involved in reactions at both photosystems, enzyme regulation in the chloroplast stroma, photorespiration, and mitochondrial electron transport in the light, and oxidants and antioxidants are discussed as metabolic indicators of redox status, acting as sensors and signal molecules leading to acclimatory responses.
Journal ArticleDOI
Photorespiration: metabolic pathways and their role in stress protection
TL;DR: The possible role of photorespiration under stress conditions, such as drought, high salt concentrations and high light intensities encountered by alpine plants, is discussed.
Journal ArticleDOI
Relationship between photosystem II activity and CO2 fixation in leaves
John P. Krall,Gerald E. Edwards +1 more
TL;DR: In this paper, a measure of the quantum yield of photosystem II, ΦII (electron/photon absorbed by PSII), can be obtained in leaves under steady-state conditions in the light using a modulated fluorescence system.
References
More filters
Journal ArticleDOI
On the Relationship Between Carbon Isotope Discrimination and the Intercellular Carbon Dioxide Concentration in Leaves
TL;DR: It is shown how diffusion of gaseous COz can significantly affect carbon isotopic discrimination and a simple relationship between discrimination and the ratio of the intercellular and atmospheric partial pressures of COZ is developed.
Journal ArticleDOI
Carbon isotope fractionation in plants
TL;DR: In this paper, the authors present a mathematical model to predict the overall isotope discrimination in terms of diffusion, interconversion, incorporation, and respiration in C 3, C 4 and crassulacean acid metabolism (CAM) photosynthetic pathways.
Journal ArticleDOI
Stomatal conductance correlates with photosynthetic capacity
TL;DR: In this paper, it was shown that stomatal aperture capacity is determined by the capacity of the mesophyll tissue to fix carbon, and that the diffusive conductance of the epidermis to CO2 transfer, g, changes in nearly the same proportion as the rate of assimilation of CO2.
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
Carbon isotope discrimination measured concurrently with gas exchange to investigate CO2 diffusion in leaves of higher plants
TL;DR: Despite uncertainties about various processes affecting carbon isotope composition, the resistance to the transfer of CO2 from the intercellular airspaces to the sites of carboxylation in the mesophyll chloroplasts was estimated and is consistent with, and provides the first direct experimental support for, theoretical equations describing discrimination during photosynthesis.
Related Papers (5)
A Biochemical Model of Photosynthetic CO 2 Assimilation in Leaves of C 3 Species
Some relationships between the biochemistry of photosynthesis and the gas exchange of leaves.
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