Abscisic acid down-regulates hydraulic conductance of grapevine leaves in isohydric genotypes only

Simple item page
dc.contributor.authorCoupel-Ledru, A.
dc.contributor.authorTyerman, S.
dc.contributor.authorMasclef, D.
dc.contributor.authorLebon, E.
dc.contributor.authorChristophe, A.
dc.contributor.authorEdwards, E.
dc.contributor.authorSimonneau, T.
dc.date.issued2017
dc.descriptionPublished September 12, 2017.
dc.description.abstractPlants evolved different strategies to cope with water stress. While isohydric species maintain their midday leaf water potential (ΨM) under soil water deficit by closing their stomata, anisohydric species maintain higher stomatal aperture and exhibit substantial reductions in ΨM. It was hypothesized that isohydry is related to a locally higher sensitivity of stomata to the drought-hormone abscisic acid (ABA). Interestingly, recent lines of evidence in Arabidopsis suggested that stomatal responsiveness is also controlled by an ABA action on leaf water supply upstream from stomata. Here, we tested the possibility in grapevine that different genotypes ranging from near isohydric to more anisohydric may have different sensitivities in these ABA responses. Measurements on whole plants in drought conditions were combined with assays on detached leaves fed with ABA. Two different methods consistently showed that leaf hydraulic conductance (Kleaf) was downregulated by exogenous ABA, with strong variations depending on the genotype. Importantly, variation between isohydry and anisohydry correlated with Kleaf sensitivity to ABA, with Kleaf in the most anisohydric genotypes being unresponsive to the hormone. We propose that observed response of Kleaf to ABA may be part of the overall ABA regulation of leaf water status.
dc.description.statementofresponsibilityAude Coupel-Ledru, Stephen D. Tyerman, Diane Masclef, Eric Lebon, Angélique Christophe, Everard J. Edwards, and Thierry Simonneau
dc.identifier.citationPlant Physiology, 2017; 175(3):1121-1134
dc.identifier.doi10.1104/pp.17.00698
dc.identifier.issn0032-0889
dc.identifier.issn1532-2548
dc.identifier.orcidTyerman, S. [0000-0003-2455-1643]
dc.identifier.urihttp://hdl.handle.net/2440/109266
dc.language.isoen
dc.publisherAmerican Society of Plant Biologists
dc.relation.granthttp://purl.org/au-research/grants/arc/CE140100008
dc.rights© 2017 American Society of Plant Biologists. All Rights Reserved. [OPEN] Articles can be viewed without a subscription.
dc.source.urihttps://doi.org/10.1104/pp.17.00698
dc.subjectVitis
dc.subjectPlant Leaves
dc.subjectWater
dc.subjectAbscisic Acid
dc.subjectDown-Regulation
dc.subjectGenotype
dc.subjectModels, Biological
dc.subjectPlant Exudates
dc.subjectGenetic Variation
dc.titleAbscisic acid down-regulates hydraulic conductance of grapevine leaves in isohydric genotypes only
dc.typeJournal article
pubs.publication-statusPublished

Files

Collections

Agriculture, Food and Wine publications