Soil carbon dioxide venting through rice roots

dc.contributor.authorKirk, Guy J. D.
dc.contributor.authorBoghi, Andrea
dc.contributor.authorAffholder, Marie-Cecile
dc.contributor.authorKeyes, Samuel D.
dc.contributor.authorHeppell, James
dc.contributor.authorRoose, Tiina
dc.date.accessioned2019-08-23T15:14:22Z
dc.date.available2019-08-23T15:14:22Z
dc.date.issued2019-08-04
dc.description.abstractThe growth of rice in submerged soils depends on its ability to form continuous gas channels—aerenchyma—through which oxygen (O2) diffuses from the shoots to aerate the roots. Less well understood is the extent to which aerenchyma permits venting of respiratory carbon dioxide (CO2) in the opposite direction. Large, potentially toxic concentrations of dissolved CO2 develop in submerged rice soils. We show using X‐ray computed tomography and image‐based mathematical modelling that CO2 venting through rice roots is far greater than thought hitherto. We found rates of venting equivalent to a third of the daily CO2 fixation in photosynthesis. Without this venting through the roots, the concentrations of CO2 and associated bicarbonate (HCO3−) in root cells would have been well above levels known to be toxic to roots. Removal of CO2 and hence carbonic acid (H2CO3) from the soil was sufficient to increase the pH in the rhizosphere close to the roots by 0.7 units, which is sufficient to solubilize or immobilize various nutrients and toxicants. A sensitivity analysis of the model showed that such changes are expected for a wide range of plant and soil conditions.en_UK
dc.identifier.citationKirk GJD, Boghi A, Affholder MC. (2019) Soil carbon dioxide venting through rice roots. Plant, Cell and Environment, Volume 42, Issue 12, December 2019, pp. 3197-3207en_UK
dc.identifier.cris24124226
dc.identifier.issn0140-7791
dc.identifier.urihttps://doi.org/10.1111/pce.13638
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/14470
dc.language.isoenen_UK
dc.publisherWileyen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectbiological modelsen_UK
dc.subjectbiological transporten_UK
dc.subjectX‐ray computed tomographyen_UK
dc.titleSoil carbon dioxide venting through rice rootsen_UK
dc.typeArticleen_UK

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