Skip to Main content Skip to Navigation
Journal articles

Over-accumulation of abscisic acid in transgenic tomato plants increases the risk of hydraulic failure

Abstract : 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.
Document type :
Journal articles
Complete list of metadata

https://hal.inrae.fr/hal-02620981
Contributor : Migration Prodinra Connect in order to contact the contributor
Submitted on : Tuesday, May 26, 2020 - 12:34:23 AM
Last modification on : Friday, July 9, 2021 - 12:02:03 PM

Links full text

Identifiers

Citation

Laurent J. Lamarque, Sylvain Delzon, Haley Toups, Anne-Isabelle Gravel, Déborah Corso, et al.. Over-accumulation of abscisic acid in transgenic tomato plants increases the risk of hydraulic failure. Plant, Cell and Environment, Wiley, 2019, pp.1-15. ⟨10.1111/pce.13703⟩. ⟨hal-02620981⟩

Share

Metrics

Record views

54