Resistance to radial CO2 diffusion contributes to between-tree variation in CO2 efflux of Populus deltoides stems

Functional Plant Biology : FPB
Kathy SteppeR O Teskey

Abstract

Rates of CO2 efflux of stems and branches are highly variable among and within trees and across stands. Scaling factors have only partially succeeded in accounting for the observed variations. In this study, the resistance to radial CO2 diffusion was quantified for tree stems of an eastern cottonwood (Populus deltoides Bartr. ex Marsh.) clone by direct manipulation of the CO2 concentration ([CO2]) of xylem sap under controlled conditions. Tree-specific linear relationships between rates of stem CO2 efflux (JO) and xylem [CO2] were found. The resistance to radial CO2 diffusion differed 6-fold among the trees and influenced the balance between the amount of CO2 retained in the xylem v. that which diffused to the atmosphere. Therefore, we hypothesised that variability in the resistance to radial CO2 diffusion might be an overlooked cause for the inconsistencies and large variations in woody tissue CO2 efflux. It was found that transition from light to dark conditions caused a rapid increase in JO and xylem [CO2], both in manipulated trees and in an intact tree with no sap manipulation. This resulted in an increased resistance to radial CO2 diffusion during the dark, at least for trees with smaller daytime resistances. Stem diamete...Continue Reading

References

Jan 30, 2003·Journal of Experimental Botany·K A SnyderL A Donovan
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Jan 1, 1980·Planta·J Schönherr, H Ziegler
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Citations

Apr 7, 2009·Plant, Cell & Environment·Alieta EylesCharles R Warren
Aug 14, 2009·Tree Physiology·Michael G RyanJosé Luiz Stape
May 26, 2017·Journal of Plant Research·Fengsen HanDan Hu
Dec 25, 2019·The New Phytologist·Patrick MeirS Ingrid Coughlin
Nov 22, 2007·The New Phytologist·Robert O TeskeyMary Anne McGuire
Sep 24, 2009·Tree Physiology·Teemu Hölttä, Pasi Kolari
Feb 13, 2016·Plant, Cell & Environment·H Jochen SchenkBradley K Esser
Apr 30, 2016·Tree Physiology·Roberto L SalomónJesús Rodríguez-Calcerrada
Mar 26, 2016·Journal of Experimental Botany·Roberto SalomónJesús Rodríguez-Calcerrada
Sep 19, 2017·The New Phytologist·Niels J F De BaerdemaekerKathy Steppe
Feb 10, 2018·Tree Physiology·Eva DarenovaMarian Pavelka
Sep 9, 2019·The New Phytologist·Roberto L SalomónKathy Steppe
Sep 18, 2015·Tree Physiology·Tom De SwaefKathy Steppe
Jun 19, 2019·Tree Physiology·Jesús Rodríguez-CalcerradaLuis Gil
Feb 15, 2020·Plants·Thomas E Marler, Murukesan V Krishnapillai
Sep 1, 2014·Functional Plant Biology : FPB·Christiane Wittmann, Hardy Pfanz
Aug 31, 2020·Tree Physiology·Lasse TarvainenJohn D Marshall
Jun 2, 2016·Environmental Science & Technology·Matt Limmer, Joel Burken

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