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000052636 084__ $$2WoS$$aPlant Sciences
000052636 1001_ $$0P:(DE-Juel1)129336$$aJahnke, S.$$b0$$uFZJ
000052636 245__ $$aAir pressure in clamp-on leaf chambers: a neglected issue in gas exchange measurements
000052636 260__ $$aOxford$$bUniv. Press$$c2006
000052636 300__ $$a2553 - 2561
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000052636 440_0 $$03318$$aJournal of Experimental Botany$$v57$$x0022-0957$$y11
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000052636 520__ $$aAir pressure in leaf chambers is thought to affect gas exchange measurements through changes in partial pressure of the air components. However, other effects may come into play when homobaric leaves are measured in which internal lateral gas flow may occur. When there was no pressure difference between the leaf chamber and ambient air (DeltaP=0), it was found in previous work that lateral CO(2) diffusion could affect measurements performed with clamp-on leaf chambers. On the other hand, overpressure (DeltaP>0) in leaf chambers has been reported to minimize artefacts possibly caused by leaks in chamber sealing. In the present work, net CO(2) exchange rates (NCER) were measured under different DeltaP values (0.0-3.0 kPa) on heterobaric and homobaric leaves. In heterobaric leaves which have internal barriers for lateral gas movement, changes in DeltaP had no significant effect on NCER. For homobaric leaves, effects of DeltaP>0 on measured NCER were significant, obviously due to lateral gas flux inside the leaf mesophyll. The magnitude of the effect was largely defined by stomatal conductance; when stomata were widely open, the impact of DeltaP on measured NCER was up to 7 mumol CO(2) m(-2) s(-1) kPa(-1). Since many other factors are also involved, neither DeltaP=0 nor DeltaP>0 was found to be the 'one-size fits all' solution to avoid erroneous effects of lateral gas transport on measurements with clamp-on leaf chambers.
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000052636 650_2 $$2MeSH$$aAir Pressure
000052636 650_2 $$2MeSH$$aArtifacts
000052636 650_2 $$2MeSH$$aBotany: instrumentation
000052636 650_2 $$2MeSH$$aBotany: methods
000052636 650_2 $$2MeSH$$aBotany: standards
000052636 650_2 $$2MeSH$$aCarbon Dioxide: chemistry
000052636 650_2 $$2MeSH$$aCarbon Dioxide: metabolism
000052636 650_2 $$2MeSH$$aDiffusion
000052636 650_2 $$2MeSH$$aPhotosynthesis
000052636 650_2 $$2MeSH$$aPlant Leaves: metabolism
000052636 650_2 $$2MeSH$$aPlant Transpiration: physiology
000052636 650_7 $$0124-38-9$$2NLM Chemicals$$aCarbon Dioxide
000052636 650_7 $$2WoSType$$aJ
000052636 65320 $$2Author$$aair pressure
000052636 65320 $$2Author$$aclamp-on leaf chamber
000052636 65320 $$2Author$$agas exchange measurement
000052636 65320 $$2Author$$ahomobaric leaves
000052636 65320 $$2Author$$arespiration
000052636 65320 $$2Author$$aphotosynthesis
000052636 65320 $$2Author$$atranspiration
000052636 7001_ $$0P:(DE-Juel1)129379$$aPieruschka, R.$$b1$$uFZJ
000052636 773__ $$0PERI:(DE-600)1466717-4$$a10.1093/jxb/erl003$$gVol. 57, p. 2553 - 2561$$p2553 - 2561$$q57<2553 - 2561$$tThe @journal of experimental botany$$v57$$x0022-0957$$y2006
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000052636 9141_ $$y2006
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