Water potential regulation, stomatal behaviour and hydraulic transport under drought : deconstructing the iso/anisohydric concept
Martínez Vilalta, Jordi, 1975- (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Garcia-Forner, Núria (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Date:	2017
Abstract:	In this review, we address the relationship between stomatal behaviour, water potential regulation and hydraulic transport in plants, focusing on the implications for the iso/anisohydric classification of plant drought responses at seasonal timescales. We first revise the history of the isohydric concept and its possible definitions. Then, we use published data to answer two main questions: (1) is greater stomatal control in response to decreasing water availability associated with a tighter regulation of leaf water potential (ΨL ) across species? and (2) is there an association between tighter ΨL regulation (~isohydric behaviour) and lower leaf conductance over time during a drought event? These two questions are addressed at two levels: across species growing in different sites and comparing only species coexisting at a given site. Our analyses show that, across species, a tight regulation of ΨL is not necessarily associated with greater stomatal control or with more constrained assimilation during drought. Therefore, iso/anisohydry defined in terms of ΨL regulation cannot be used as an indicator of a specific mechanism of drought-induced mortality or as a proxy for overall plant vulnerability to drought.
Grants:	Ministerio de Economía y Competitividad CGL2013-46808-R Ministerio de Economía y Competitividad CGL2010-16373
Note:	Altres ajuts: JMV benefits from an ICREA Academia award.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Subject:	Anisohydry ; Embolism ; Hydraulic architecture ; Isohydry ; Plant strategies ; Seasonal responses ; Stomata ; Water relations ; Xylem transport
Published in:	Plant, cell & environment, Vol. 40, issue 6 (June 2017) , p. 962-976, ISSN 1365-3040

DOI: 10.1111/pce.12846

Post-print 69 p, 2.7 MB

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