NDLI: Inhibition by light of CO$_{2}$ evolution from dark respiration: Comparison of two gas exchange methods

Content Provider	Springer Nature Link
Author	Peisker, Martin Apel, Hannelore
Copyright Year	2001
Abstract	Two approaches to determine the fraction (μ) of mitochondrial respiration sustained during illumination by measuring CO$_{2}$ gas exchange are compared. In single leaves, the respiration rate in the light (`day respiration' rate R$_{d}$) is determined as the ordinate of the intersection point of A–c$_{i}$ curves at various photon flux densities and compared with the CO$_{2}$ evolution rate in darkness (`night respiration' rate R$_{n}$). Alternatively, using leaves with varying values of CO$_{2}$ compensation concentration (Γ), intracellular resistance (r$_{i}$) and R$_{n}$, an average number for μ can be derived from the linear regression between Γ and the product r$_{i}$ċR$_{n}$. Both methods also result in a number c* for that intercellular CO$_{2}$ concentration at which net CO$_{2}$ uptake rate is equal to –R$_{d}$. c* is an approximate value of the photocompensation point Γ* (Γ in the absence of mitochondrial respiration), which is related to the CO$_{2}$/O$_{2}$ specificity factor of Rubisco S$_{c/o}$. The presuppositions and limitations for application of both approaches are discussed. In leaves of Nicotiana tabacum, at 22 °C, single leaf measurements resulted in mean values of μ = 0.71 and c$_{}$ = 34 μmol mol$^{−1}$. At the photosynthetically active photon flux density of 960 μmol quanta m$^{−2}$ s$^{−1}$, nearly the same numbers were derived from the linear relationship between Γ and r$_{i}$ċR$_{n}$. c and R$_{d}$ determined by single leaf measurements varied between 31 and 41 μmol mol$^{−1}$ and between 0.37 and 1.22 μmol m$^{−2}$ s$^{−1}$, respectively. A highly significant negative correlation between c* and R$_{d}$ was found. From the regression equation we obtained estimates for Γ* (39 μmol mol$^{−1}$), S$_{c/o}$ (96.5 mol mol$^{−1}$) and the mesophyll CO$_{2}$ transfer resistance (7.0 mol$^{−1}$ m$^{2}$ s).
Starting Page	291
Ending Page	298
Page Count	8
File Format	PDF
ISSN	01668595
Journal	Photosynthesis Research
Volume Number	70
Issue Number	3
e-ISSN	15735079
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science Medicine Biochemistry

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