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Herbaceous angiosperms are not more vulnerable to drought-induced embolism than angiosperm trees

hal.structure.identifierNaturalis Biodiversity Center [Leiden]
dc.contributor.authorLENS, Frederic
hal.structure.identifierUnité de recherche sur l'Ecosystème Prairial [UREP]
dc.contributor.authorPICON-COCHARD, Catherine
hal.structure.identifierSanté et agroécologie du vignoble [UMR SAVE]
dc.contributor.authorDELMAS, Chloé E. L.
hal.structure.identifierEcole Polytechnique Fédérale de Lausanne [EPFL]
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
dc.contributor.authorSIGNARBIEUX, Constant
hal.structure.identifierSwiss Federal Institute for Forest, Snow and Landscape Research WSL
hal.structure.identifierEcole Polytechnique Fédérale de Lausanne [EPFL]
dc.contributor.authorBUTTLER, Alexandre
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l'Arbre Fruitier et Forestier [PIAF]
dc.contributor.authorCOCHARD, Hervé
hal.structure.identifierUniversität Ulm - Ulm University [Ulm, Allemagne]
dc.contributor.authorJANSEN, Steven
hal.structure.identifierUnité de recherche Amélioration, Génétique et Physiologie Forestières [AGPF]
dc.contributor.authorCHAUVIN, Thibaud
hal.structure.identifierNaturalis Biodiversity Center [Leiden]
dc.contributor.authorCHACON DORIA, Larissa
hal.structure.identifierUniversidad de La Laguna [Tenerife - SP] [ULL]
dc.contributor.authorDEL ARCO, Marcelino
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
dc.date.issued2016
dc.identifier.issn0032-0889
dc.description.abstractEnThe water transport pipeline in herbs is assumed to be more vulnerable to drought than in trees due to the formation of frequent embolisms (gas bubbles), which could be removed by the occurrence of root pressure, especially in grasses. Here, we studied hydraulic failure in herbaceous angiosperms by measuring the pressure inducing 50% loss of hydraulic conductance (P50) in stems of 26 species - mainly European grasses (Poaceae).Our measurements show a large range in P50 from -0.5 to -7.5MPa, which overlaps with 94% of the woody angiosperm species in a worldwide, published dataset, and which strongly correlates with an aridity 52 index. Moreover, the P50 values obtained were substantially more negative than the midday water potentials for five grass species monitored throughout the entire growing season, suggesting that embolism formation and repair are not routine and mainly occur under water deficits. These results show that both herbs and trees share the ability to withstand very negative water potentials without embolism formation in their xylem conduits during drought stress. In addition, structure function trade-offs in grass stems reveal that more resistant species are more lignified which was confirmed for herbaceous and closely related woody species of the daisy group (Asteraceae). Our findings could imply that herbs with more lignified stems will become more abundant in future grasslands under more frequent and severe droughts, potentially resulting in lower forage digestibility.
dc.language.isoen
dc.publisherOxford University Press ; American Society of Plant Biologists
dc.subjectprairie
dc.subjectsécheresse
dc.title.enHerbaceous angiosperms are not more vulnerable to drought-induced embolism than angiosperm trees
dc.typeArticle de revue
dc.identifier.doi10.1104/pp.16.00829
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale
dc.subject.halSciences de l'environnement/Biodiversité et Ecologie
bordeaux.journalPlant Physiology
bordeaux.page661-667
bordeaux.volume172
bordeaux.issue2
bordeaux.peerReviewedoui
hal.identifierhal-02638426
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02638426v1
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