CORSO, Déborah; DELZON, Sylvain; LAMARQUE, Laurent; COCHARD, Hervé; TORRES RUIZ, Jose Manuel; KING, Andrew; BRODRIBB, Timothy

doi:10.1111/pce.13722

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CORSO, Déborah
University of Tasmania [Hobart] [UTAS]

DELZON, Sylvain
Biodiversité, Gènes & Communautés [BioGeCo]

LAMARQUE, Laurent
Biodiversité, Gènes & Communautés [BioGeCo]
Ecophysiologie et Génomique Fonctionnelle de la Vigne [UMR EGFV]

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Ce document a été publié dans

Plant, Cell and Environment. 2020, vol. Online first, p. 1-12

Wiley

Résumé en anglais

Identifying 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.< Réduire

Mots clés

hydraulic conductance

Mots clés en anglais

crops

drought stress

DOI

http://dx.doi.org/10.1111/pce.13722

Project ANR

Plateforme d'Innovation " Forêt-Bois-Fibre-Biomasse du Futur " - ANR-10-EQPX-0016
COntinental To coastal Ecosystems: evolution, adaptability and governance - ANR-10-LABX-0045

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Unités de recherche

BioGeCo (Biodiversité Gènes & Communautés) - UMR 1202