LAMARQUE, Laurent J.; DELZON, Sylvain; TOUPS, Haley; GRAVEL, Anne-Isabelle; CORSO, Déborah; BADEL, Eric; BURLETT, Régis; CHARRIER, Guillaume; COCHARD, Hervé; JANSEN, Steven; DESAILLY-VALENTIN, Marion; TORRES RUIZ, Jose Manuel; POUZOULET, Jérôme; CRAMER, Grant R.; THOMPSON, Andrew J.; GAMBETTA, Gregory A.

doi:10.1111/pce.13703

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Licence d’utilisation du document

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

DELZON, Sylvain
Biodiversité, Gènes & Communautés [BioGeCo]

TOUPS, Haley
Department of Biochemistry and Molecular Biology

Langue

Article de revue

Ce document a été publié dans

Plant, Cell and Environment. 2020-03, vol. 43, n° 3, p. 548-562

Wiley

Résumé en anglais

Climate change threatens food security, and plant science researchers have investigated methods of sustaining crop yield under drought. One approach has been to overproduce abscisic acid (ABA) to enhance water use efficiency. However, the concomitant effects of ABA overproduction on plant vascular system functioning are critical as it influences vulnerability to xylem hydraulic failure. We investigated these effects by comparing physiological and hydraulic responses to water deficit between a tomato (Solanum lycopersicum) wild type control (WT) and a transgenic line overproducing ABA (sp12). Under well-watered conditions, the sp12 line displayed similar growth rate and greater water use efficiency by operating at lower maximum stomatal conductance. X-ray microtomography revealed that sp12 was significantly more vulnerable to xylem embolism, resulting in a reduced hydraulic safety margin. We also observed a significant ontogenic effect on vulnerability to xylem embolism for both WT and sp12. This study demonstrates that the greater water use efficiency in the tomato ABA overproducing line is associated with higher vulnerability of the vascular system to embolism and a higher risk of hydraulic failure. Integrating hydraulic traits into breeding programmes represents a critical step for effectively managing a crop's ability to maintain hydraulic conductivity and productivity under water deficit.< Réduire

Mots clés en anglais

crop

drought

transgenic line

water deficit

xylem embolism

DOI

http://dx.doi.org/10.1111/pce.13703

Project ANR

Plateforme d'Innovation " Forêt-Bois-Fibre-Biomasse du Futur "
COntinental To coastal Ecosystems: evolution, adaptability and governance

Origine

Importé de hal

Unités de recherche

Ecophysiologie et Génomique Fonctionnelle de la Vigne (EGFV) - UMR 1287