Estimating the internal conductance to CO2 movement

Functional Plant Biology : FPB
Charles R Warren

Abstract

The concentration of CO2 in the chloroplast is less than atmospheric owing to a series of gas-phase and liquid-phase resistances. For a long time it was assumed that the concentration of CO2 in the chloroplasts is the same as in the intercellular spaces (e.g. as measured by gas exchange). There is mounting evidence that this assumption is invalid and that CO2 concentrations in the chloroplasts are significantly less than intercellular CO2. It is now generally accepted that internal conductance (gi) is a significant limitation to photosynthesis, often as large as that due to stomata. Internal conductance describes this decrease in CO2 concentration between the intercellular spaces and chloroplasts as a function of net photosynthesis [gi = A / (Ci - Cc)]. Internal conductance is commonly estimated by simultaneous measurements of gas exchange and chlorophyll a fluorescence or instantaneous discrimination against 13CO2. These common methods are complemented by three alternative methods based on (a) the difference between intercellular and chloroplastic CO2 photocompensation points, (b) the curvature of an A / Ci curve, and (c) the initial slope of an A / Ci curve v. the estimated initial slope of an A / Cc curve. The theoretical ba...Continue Reading

References

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Citations

Mar 4, 2009·Journal of Experimental Botany·Youshi TazoeJohn R Evans
Apr 28, 2009·Journal of Experimental Botany·John R EvansIchiro Terashima
Jan 20, 2010·Plant, Cell & Environment·Guillaume TcherkezJaleh Ghashghaie
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May 1, 2008·Functional Plant Biology : FPB·Guillaume Tcherkez, Graham D Farquhar
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Sep 15, 2011·Journal of Experimental Botany·Matthew Edmund GilbertN Michele Holbrook

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Methods Mentioned

BETA
Fluorescence

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