Abstract
In flooded soils, roots are exposed to a reducing environment with low oxygen availability. In order to supply roots with sufficient oxygen for respiration, most wetland plants form extended gas-filled cavities known as aerenchyma (in the root) or lacunae (in the shoot). Oxygen transport can be either diffusive or convective; according to general belief, the latter is restricted to the existence of separate “inlet” and “outlet” structures, e.g. in extended rhizomes. Mainly three separate mechanisms of convective oxygen transport have been identified so far: (1) Humidity-induced pressurization/convection that is driven by a difference in vapour pressure between the water-saturated gas phase of the leaf intercellulars and the microenvironment. When a significant overpressure in the gas phase of the leaf is maintained, gas flow to a distant “outlet”, being at atmospheric pressure, is generated. (2) Thermal osmosis, a mass flow of gas into the leaf driven by heat transfer in the opposite direction and (3) Venturi-induced convection, a gas flow initiated by an underpressure in the gas phase of broken culms (e.g. of Phragmites communis) that is generated by wind passing over them. Species with extended pathways for gas transport (with formation frequently being induced by hypoxia or anoxia) dominate in wetland communities and can even provide the rhizosphere of flooded soils with oxygen.
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Abbreviations
- ATP:
-
Adenosine triphosphate
- \( {c_{{{\rm{O}}_{\rm{2}}}}} \) :
-
Oxygen concentration
- \( {C_{{{\rm{0}}}}} \) :
-
Initial Oxygen concentration
- COPR:
-
Critical oxygen pressure for respiration
- D:
-
Diffusion coefficient
- \( {k_{\rm{H}}} \) :
-
Henry’s gas constant for O2 in water
- \( {J_{{{\rm{O}}_2}}} \) :
-
Oxygen flux
- l :
-
Root length
- M :
-
Respiratory demand
- P(O2):
-
Oxygen partial pressure
- Q :
-
Oxygen consumption by respiration
- \( {R_0} \) :
-
Root radius
- ROL:
-
Radial oxygen loss
- \( {R_{\rm{SH}}} \) :
-
Diffusional resistance between root surface and oxygen electrode
- \( {R_{\rm{T}}} \) :
-
Complex resistance of the root tissue (includes root porosity, consumption of O2 along the pathway by respiration and radial loss, and the diffusional resistance for radial O2 transport)
- є :
-
Fractional porosity of the root
- T :
-
Temperature
- τ :
-
Tortuosity of a diffusion pathway
- ρ :
-
Air density
- v :
-
Wind speed
- \( {\nabla^2} \) :
-
Laplacian operator
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Acknowledgements
I received financial support by a grant provided by the “Karlsruhe Institute of Technology” within the framework of the “German excellence initiative”. I would also like to thank Prof Tim Colmer for the critical reading of the manuscript.
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Wegner, L.H. (2010). Oxygen Transport in Waterlogged Plants. In: Mancuso, S., Shabala, S. (eds) Waterlogging Signalling and Tolerance in Plants. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-10305-6_1
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DOI: https://doi.org/10.1007/978-3-642-10305-6_1
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