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Neither xylem collapse, cavitation, or changing leaf conductance drive stomatal closure in wheat

hal.structure.identifierUniversity of Tasmania [Hobart, Australia] [UTAS]
dc.contributor.authorCORSO, Déborah
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
hal.structure.identifierEcophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]
dc.contributor.authorLAMARQUE, Laurent
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorCOCHARD, Hervé
hal.structure.identifierLaboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant [PIAF]
dc.contributor.authorTORRES RUIZ, Jose Manuel
hal.structure.identifierSynchrotron SOLEIL [SSOLEIL]
dc.contributor.authorKING, Andrew
hal.structure.identifierUniversity of Tasmania [Hobart, Australia] [UTAS]
dc.contributor.authorBRODRIBB, Timothy
dc.date.issued2020
dc.identifier.issn0140-7791
dc.description.abstractEnIdentifying the drivers of stomatal closure and leaf damage during stress in grasses is a critical prerequisite for understanding crop resilience. Here, we investigated whether changes in stomatal conductance (g(s)) during dehydration were associated with changes in leaf hydraulic conductance (K-leaf), xylem cavitation, xylem collapse, and leaf cell turgor in wheat (Triticum aestivum). During soil dehydration, the decline of g(s) was concomitant with declining K-leaf under mild water stress. This early decline of leaf hydraulic conductance was not driven by cavitation, as the first cavitation events in leaf and stem were detected well after K-leaf had declined. Xylem vessel deformation could only account for <5% of the observed decline in leaf hydraulic conductance during dehydration. Thus, we concluded that changes in the hydraulic conductance of tissues outside the xylem were responsible for the majority of K-leaf decline during leaf dehydration in wheat. However, the contribution of leaf resistance to whole plant resistance was less than other tissues (<35% of whole plant resistance), and this proportion remained constant as plants dehydrated, indicating that K-leaf decline during water stress was not a major driver of stomatal closure.
dc.language.isoen
dc.publisherWiley
dc.subjecthydraulic conductance
dc.subject.encrops
dc.subject.endrought stress
dc.title.enNeither xylem collapse, cavitation, or changing leaf conductance drive stomatal closure in wheat
dc.typeArticle de revue
dc.identifier.doi10.1111/pce.13722
dc.subject.halSciences du Vivant [q-bio]
dc.subject.halSciences du Vivant [q-bio]/Biologie végétale
bordeaux.journalPlant, Cell and Environment
bordeaux.page1-12
bordeaux.volumeOnline first
bordeaux.peerReviewedoui
hal.identifierhal-02623136
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02623136v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=Plant,%20Cell%20and%20Environment&amp;rft.date=2020&amp;rft.volume=Online%20first&amp;rft.spage=1-12&amp;rft.epage=1-12&amp;rft.eissn=0140-7791&amp;rft.issn=0140-7791&amp;rft.au=CORSO,%20D%C3%A9borah&amp;DELZON,%20Sylvain&amp;LAMARQUE,%20Laurent&amp;COCHARD,%20Herv%C3%A9&amp;TORRES%20RUIZ,%20Jose%20Manuel&amp;rft.genre=article


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