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Leaf membrane leakage and xylem hydraulic failure define the point of no return in drought‐induced tree mortality in <i>Cupressus sempervirens</i>

hal.structure.identifierInstitute of Plant Sciences and Genetics in Agriculture
hal.structure.identifierVolcani Center
dc.contributor.authorALON, Asaf
hal.structure.identifierVolcani Center
dc.contributor.authorCOHEN, Shabtai
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorBURLETT, Regis
hal.structure.identifierVolcani Center
dc.contributor.authorESELSON, Elena
hal.structure.identifierThe Hebrew University of Jerusalem [HUJ]
dc.contributor.authorRIOV, Joseph
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorDELZON, Sylvain
hal.structure.identifierVolcani Center
dc.contributor.authorDAVID‐SCHWARTZ, Rakefet
dc.date.accessioned2024-11-22T03:01:39Z
dc.date.available2024-11-22T03:01:39Z
dc.date.issued2024-07
dc.identifier.issn0031-9317
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/203407
dc.description.abstractEn<div><p>Measurements of resistance to embolism suggest that Cupressus sempervirens has a stem xylem that resists embolism at very negative water potentials, with 50% embolism (P 50 ) at water potentials of approximately À10 MPa. However, field observations in a semi-arid region suggest tree mortality occurs before 10% embolism. To explore the interplay between embolism and plant mortality, we conducted a controlled drought experiment involving two types of CS seedlings: a local seed source (S-type) and a drought-resistant clone propagated from a semi-arid forest (C-type). We measured resistance to embolism, leaf relative water content (RWC), water potential, photosynthesis, electrolyte leakage (EL), plant water loss, leaf hydraulic conductivity, and leaf non-structural carbohydrate (NSC) content during plant dehydration and before rewatering. All measured individuals were monitored for survival or mortality.</p><p>While the S-and C-types differed in P 50 , transpiration, and mortality rates, both displayed seedling mortality corresponding to threshold values of 52-55% leaf RWC, 55% and 18.5% percent loss of conductivity (PLC) in the xylem, which corresponds to 48% and 37% average EL values for S and C types, respectively. Although C-type C. sempervirens NSC content increased in response to drought, no differences were observed in NSC content between live and dead seedlings of both types. Our findings do not fully explain tree mortality in the field but they do indicate that loss of membrane integrity occurs before or at xylem water potential, leading to hydraulic failure.</p></div>
dc.language.isoen
dc.publisherWiley
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/
dc.title.enLeaf membrane leakage and xylem hydraulic failure define the point of no return in drought‐induced tree mortality in <i>Cupressus sempervirens</i>
dc.typeArticle de revue
dc.identifier.doi10.1111/ppl.14467
dc.subject.halSciences de l'environnement
bordeaux.journalPhysiologia Plantarum
bordeaux.volume176
bordeaux.hal.laboratoriesBioGeCo (Biodiversité Gènes & Communautés) - UMR 1202*
bordeaux.issue4
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-04796349
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04796349v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=Physiologia%20Plantarum&amp;rft.date=2024-07&amp;rft.volume=176&amp;rft.issue=4&amp;rft.eissn=0031-9317&amp;rft.issn=0031-9317&amp;rft.au=ALON,%20Asaf&amp;COHEN,%20Shabtai&amp;BURLETT,%20Regis&amp;ESELSON,%20Elena&amp;RIOV,%20Joseph&amp;rft.genre=article


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