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Radial-axial transport coordination enhances sugar translocation in the phloem vasculature of plants

hal.structure.identifierDuke University [Durham]
dc.contributor.authorNAKAD, Mazen
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
hal.structure.identifierDuke University [Durham]
dc.contributor.authorDOMEC, Jean‐christophe
dc.contributor.authorSEVANTO, Sanna
hal.structure.identifierDepartment of Civil and Environmental Engineering [Durham] [CEE]
hal.structure.identifierDuke University [Durham]
dc.contributor.authorKATUL, Gabriel
dc.date.accessioned2024-04-08T11:47:09Z
dc.date.available2024-04-08T11:47:09Z
dc.date.issued2022-05-19
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/195270
dc.description.abstractEnThe overall speed of sap translocation increases by including a concentration-dependent viscosity in axial and radial directions.Understanding mass transport of photosynthates in the phloem of plants is necessary for predicting plant carbon allocation, productivity, and responses to water and thermal stress. Several hypotheses about optimization of phloem structure and function and limitations of phloem transport under drought have been proposed and tested with models and anatomical data. However, the true impact of radial water exchange of phloem conduits with their surroundings on mass transport of photosynthates has not been addressed. Here, the physics of the Munch mechanism of sugar transport is re-evaluated to include local variations in viscosity resulting from the radial water exchange in two dimensions (axial and radial) using transient flow simulations. Model results show an increase in radial water exchange due to a decrease in sap viscosity leading to increased sugar front speed and axial mass transport across a wide range of phloem conduit lengths. This increase is around 40% for active loaders (e.g. crops) and around 20% for passive loaders (e.g. trees). Thus, sugar transport operates more efficiently than predicted by previous models that ignore these two effects. A faster front speed leads to higher phloem resiliency under drought because more sugar can be transported with a smaller pressure gradient.
dc.language.isoen
dc.title.enRadial-axial transport coordination enhances sugar translocation in the phloem vasculature of plants
dc.typeArticle de revue
dc.identifier.doi10.1093/plphys/kiac231
dc.subject.halSciences de l'environnement
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-03693978
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03693978v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.date=2022-05-19&rft.au=NAKAD,%20Mazen&DOMEC,%20Jean%E2%80%90christophe&SEVANTO,%20Sanna&KATUL,%20Gabriel&rft.genre=article


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