A Direct Confirmation of the Standard Method of Estimating Intercellular Partial Pressure of CO2 | Zendy

Thomas D. Sharkey | Zendy; Katsu IMAI | Zendy; Graham D. Farquhar | Zendy; I.R. Cowan | Zendy

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A Direct Confirmation of the Standard Method of Estimating Intercellular Partial Pressure of CO₂

Author(s) -

Thomas D. Sharkey,

Katsu IMAI,

Graham D. Farquhar,

I.R. Cowan

Publication year - 1982

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.69.3.657

Subject(s) - partial pressure , peristaltic pump , analytical chemistry (journal) , flux (metallurgy) , chemistry , water vapor , pressure measurement , vapor pressure , gas analyzer , vapour pressure of water , materials science , thermodynamics , chromatography , oxygen , physics , environmental chemistry , organic chemistry

The partial pressure of CO(2) inside leaves of several species was measured directly. Small gas exchange chambers were clamped above and below the same section of an amphistomatous leaf. A flowing gas stream through one chamber allowed normal CO(2) and water vapor exchange. The other chamber was in a closed circuit consisting of the chamber, an infrared gas analyzer, and a peristaltic pump. The CO(2) in the closed system rapidly reached a steady pressure which it is believed was identical to the CO(2) pressure inside the leaf, because there was no flux of CO(2) across the epidermis. This measured partial pressure was in close agreement with that estimated from a consideration of the fluxes of CO(2) and vapor at the other surface.

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