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Balancing the risks of hydraulic failure and carbon starvation : a twig scale analysis in declining Scots pine
Salmon, Yann (University of Edinburgh. School of GeoSciences)
Torres-Ruiz, José M. (Institut national de la recherche agronomique (França))
Poyatos López, Rafael (Centre de Recerca Ecològica i Aplicacions Forestals)
Martínez Vilalta, Jordi, 1975- (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Meir, Patrick (University of Edinburgh. School of GeoSciences)
Cochard, Hervé (Institut national de la recherche agronomique (França))
Mencuccini, Maurizio (University of Edinburgh. School ofGeoSciences)

Date: 2015
Abstract: Understanding physiological processes involved in drought-induced mortality is important for predicting the future of forests and for modelling the carbon and water cycles. Recent research has highlighted the variable risks of carbon starvation and hydraulic failure in drought-exposed trees. However, little is known about the specific responses of leaves and supporting twigs, despite their critical role in balancing carbon acquisition and water loss. Comparing healthy (non-defoliated) and unhealthy (defoliated) Scots pine at the same site, we measured the physiological variables involved in regulating carbon and water resources. Defoliated trees showed different responses to summer drought compared with non-defoliated trees. Defoliated trees maintained gas exchange while non-defoliated trees reduced photosynthesis and transpiration during the drought period. At the branch scale, very few differences were observed in non-structural carbohydrate concentrations between health classes. However, defoliated trees tended to have lower water potentials and smaller hydraulic safety margins. While non-defoliated trees showed a typical response to drought for an isohydric species, the physiology appears to be driven in defoliated trees by the need to maintain carbon resources in twigs. These responses put defoliated trees at higher risk of branch hydraulic failure and help explain the interaction between carbon starvation and hydraulic failure in dying trees.
Note: Acknowledgments: part of this work were supported by an STSMGrant from COST Action FP1106 (STReESS)
Note: Número d'acord de subvenció MICINN/CSD2008-00040
Note: Número d'acord de subvenció MICINN/CGL2010-16373
Rights: Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. Creative Commons
Language: Anglès.
Document: article ; recerca ; publishedVersion
Subject: Drought ; Ecophysiology ; Leaf gas exchange ; Mortality ; NSC ; Photosynthesis ; Transpiration ; Tree
Published in: Plant, cell & environment, Vol. 38, Issue 12 (Dec. 2015) , p. 2575-2588, ISSN 0140-7791

DOI: 10.1111/pce.12572
PMID: 25997464

14 p, 747.8 KB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (scientific output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Articles > Research articles
Articles > Published articles

 Record created 2016-04-12, last modified 2020-08-03

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