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Osmolality and non-structural carbohydrate composition in the secondary phloem of trees across a latitudinal gradient in Europe

hal.structure.identifierDepartment of Forest Sciences
dc.contributor.authorLINTUNEN, Anna
hal.structure.identifierDepartment of Forest Sciences
dc.contributor.authorPALJAKKA, Teemu
hal.structure.identifierNatural Resources Institute Finland [LUKE]
dc.contributor.authorJYSKE, Tuula
hal.structure.identifierNatural Resources Institute Finland [LUKE]
dc.contributor.authorPELTONIEMI, Mikko
hal.structure.identifierWageningen University and Research [Wageningen] [WUR]
dc.contributor.authorSTERCK, Frank
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
dc.contributor.authorVON ARX, Georg
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
dc.contributor.authorCOCHARD, Hervé
hal.structure.identifierWageningen University and Research [Wageningen] [WUR]
hal.structure.identifierAlterra
dc.contributor.authorCOPINI, Paul
hal.structure.identifierForest Research Centre, School of Agriculture
dc.contributor.authorCALDEIRA, Maria C.
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierMendel University in Brno [MENDELU]
dc.contributor.authorGEBAUER, Roman
hal.structure.identifierDepartment of Forest Sciences
dc.contributor.authorGRÖNLUND, Leila
hal.structure.identifierWageningen University and Research [Wageningen] [WUR]
dc.contributor.authorKIORAPOSTOLOU, Natasa
hal.structure.identifierUniversità degli Studi di Padova = University of Padua [Unipd]
dc.contributor.authorLECHTHALER, Silvia
hal.structure.identifierForest Research Centre, School of Agriculture
dc.contributor.authorLOBO-DO-VALE, Raquel
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
dc.contributor.authorPETERS, Richard L.
hal.structure.identifierUniversità degli Studi di Padova = University of Padua [Unipd]
dc.contributor.authorPETIT, Giai
hal.structure.identifierUniversità degli Studi di Padova = University of Padua [Unipd]
dc.contributor.authorPRENDIN, Angela L.
hal.structure.identifierDepartment of Physics
dc.contributor.authorSALMON, Yann
hal.structure.identifierLaboratory of Plant Ecology, Department of Applied Ecology and Environmental Biology
dc.contributor.authorSTEPPE, Kathy
hal.structure.identifierMendel University in Brno [MENDELU]
dc.contributor.authorURBAN, Josef
hal.structure.identifierNatural Resources Institute Finland [LUKE]
dc.contributor.authorROIG JUAN, Sílvia
hal.structure.identifierCentre for Ecological Research and Forestry Applications [CREAF]
hal.structure.identifierLaboratory of Plant Biology and Nature Management (APNA)
hal.structure.identifierLaboratory of Wood Biology and Xylarium
dc.contributor.authorROBERT, Elisabeth M. R.
hal.structure.identifierDepartment of Forest Sciences
dc.contributor.authorHOLTTA, Teemu
dc.date.issued2016
dc.identifier.issn1664-462X
dc.description.abstractEnPhloem osmolality and its components are involved in basic cell metabolism, cell growth, and in various physiological processes including the ability of living cells to withstand drought and frost. Osmolality and sugar composition responses to environmental stresses have been extensively studied for leaves, but less for the secondary phloem of plant stems and branches. Leaf osmotic concentration and the share of pinitol and raffinose among soluble sugars increase with increasing drought or cold stress, and osmotic concentration is adjusted with osmoregulation. We hypothesize that similar responses occur in the secondary phloem of branches. We collected living bark samples from branches of adult Pinus sylvestris, Picea abies, Betula pendula and Populus tremula trees across Europe, from boreal Northern Finland to Mediterranean Portugal. In all studied species, the observed variation in phloem osmolality was mainly driven by variation in phloem water content, while tissue solute content was rather constant across regions. Osmoregulation, in which osmolality is controlled by variable tissue solute content, was stronger for Betula and Populus in comparison to the evergreen conifers. Osmolality was lowest in mid-latitude region, and from there increased by 37% toward northern Europe and 38% toward southern Europe due to low phloem water content in these regions. The ratio of raffinose to all soluble sugars was negligible at mid-latitudes and increased toward north and south, reflecting its role in cold and drought tolerance. For pinitol, another sugar known for contributing to stress tolerance, no such latitudinal pattern was observed. The proportion of sucrose was remarkably low and that of hexoses (i.e., glucose and fructose) high at mid-latitudes. The ratio of starch to all non-structural carbohydrates increased toward the northern latitudes in agreement with the build-up of osmotically inactive C reservoir that can be converted into soluble sugars during winter acclimation in these cold regions. Present results for the secondary phloem of trees suggest that adjustment with tissue water content plays an important role in osmolality dynamics. Furthermore, trees acclimated to dry and cold climate showed high phloem osmolality and raffinose proportion.
dc.language.isoen
dc.publisherFrontiers
dc.subjectraffinose
dc.subject.enhexose
dc.subject.enosmotic concentration
dc.subject.enphloem water content
dc.subject.enpinitol
dc.subject.ensucrose
dc.subject.enstarch
dc.title.enOsmolality and non-structural carbohydrate composition in the secondary phloem of trees across a latitudinal gradient in Europe
dc.typeArticle de revue
dc.identifier.doi10.3389/fpls.2016.00726
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences de l'environnement
bordeaux.journalFrontiers in Plant Science
bordeaux.page15 p.
bordeaux.volume7
bordeaux.peerReviewedoui
hal.identifierhal-02635301
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02635301v1
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