On the gaseous exchange of ammonia between leaves and the environment

Determination of the ammonia compensation point.

Graeme Farquhar, Peter Firth, Rob Wetselaar, B Weir

Research output: Contribution to journalArticle

Abstract

Whole shoots of Phaseolus vulgaris L. and other species were exposed to a range of partial pressures of gaseous ammonia in air and the resulting fluxes were measured. Net uptake is linear with partial pressure in the range 5 to 50 nanobars and is zero at a finite partial pressure, termed the ammonia compensation point. Below the compensation point, ammonia (or possibly other volatile amines) is evolved by the leaves. The compensation points in several species are near the low partial pressures found in unpolluted air and approximate to the Km of glutamine synthetase in vitro. In P. vulgaris L., the compensation point increases with temperature.
Original languageEnglish
Pages (from-to)710 - 714
Number of pages5
JournalPlant Physiology
Volume66
Issue number4
DOIs
Publication statusPublished - 1980
Externally publishedYes

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Partial Pressure
Ammonia
gas exchange
ammonia
Phaseolus
Phaseolus vulgaris
leaves
Air
air
Glutamate-Ammonia Ligase
glutamate-ammonia ligase
amines
Amines
Temperature
shoots
temperature

Cite this

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abstract = "Whole shoots of Phaseolus vulgaris L. and other species were exposed to a range of partial pressures of gaseous ammonia in air and the resulting fluxes were measured. Net uptake is linear with partial pressure in the range 5 to 50 nanobars and is zero at a finite partial pressure, termed the ammonia compensation point. Below the compensation point, ammonia (or possibly other volatile amines) is evolved by the leaves. The compensation points in several species are near the low partial pressures found in unpolluted air and approximate to the Km of glutamine synthetase in vitro. In P. vulgaris L., the compensation point increases with temperature.",
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On the gaseous exchange of ammonia between leaves and the environment : Determination of the ammonia compensation point. . / Farquhar, Graeme; Firth, Peter; Wetselaar, Rob; Weir, B.

In: Plant Physiology, Vol. 66, No. 4, 1980, p. 710 - 714.

Research output: Contribution to journalArticle

TY - JOUR

T1 - On the gaseous exchange of ammonia between leaves and the environment

T2 - Determination of the ammonia compensation point.

AU - Farquhar, Graeme

AU - Firth, Peter

AU - Wetselaar, Rob

AU - Weir, B

PY - 1980

Y1 - 1980

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DO - 10.1104/pp.66.4.710

M3 - Article

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JO - Plant Physiology

JF - Plant Physiology

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