Over-accumulation of abscisic acid in transgenic tomato plants increases the risk of hydraulic failure
2020
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. | Ecophysiologie et Génomique Fonctionnelle de la Vigne (UMR EGFV) ; Université de Bordeaux (UB)-Institut des Sciences de la Vigne et du Vin (ISVV)-Ecole Nationale Supérieure des Sciences Agronomiques de Bordeaux-Aquitaine (Bordeaux Sciences Agro)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Biodiversité, Gènes & Communautés (BioGeCo) ; Université de Bordeaux (UB)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Department of Biochemistry and Molecular Biology ; University of Nevada [Reno] | Laboratoire de Physique et Physiologie Intégratives de l’Arbre en environnement Fluctuant (PIAF) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Clermont Auvergne (UCA) | Institute of Systematic Botany and Ecology ; Universität Ulm - Ulm University [Ulm, Allemagne] | Synchrotron SOLEIL (SSOLEIL) ; Centre National de la Recherche Scientifique (CNRS) | Cranfield University | Biotechnology and Biological Sciences Research Council (BBSRC) / BB/L01954X/1IdEx Bordeaux International / UB101 CR1024-R s/CR 1024-6MUK BBSRC Research / BB/L01954X/1French National Research Agency (ANR) / ANR-10-LABX-45Cluster of Excellence COTE /ANR-10-LABX-45Investments for the Future / ANR-10-EQPX-16 | ANR-10-EQPX-0016,XYLOFOREST,Plateforme d'Innovation " Forêt-Bois-Fibre-Biomasse du Futur "(2010) | ANR-10-LABX-0045,COTE,COntinental To coastal Ecosystems: evolution, adaptability and governance(2010)
International audience
Mostrar más [+] Menos [-]Inglés. 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.
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