Abscisic acid acts essentially on stomata, not on the xylem, to improve drought resistance in tomato.
Solanum lycopersicum
embolism resistance
hydraulic vulnerability
minimum leaf conductance
water deficit
water loss
Journal
Plant, cell & environment
ISSN: 1365-3040
Titre abrégé: Plant Cell Environ
Pays: United States
ID NLM: 9309004
Informations de publication
Date de publication:
Nov 2023
Nov 2023
Historique:
revised:
15
07
2023
received:
10
05
2023
accepted:
22
07
2023
pubmed:
1
8
2023
medline:
1
8
2023
entrez:
1
8
2023
Statut:
ppublish
Résumé
Drought resistance is essential for plant production under water-limiting environments. Abscisic acid (ABA) plays a critical role in stomata but its impact on hydraulic function beyond the stomata is far less studied. We selected genotypes differing in their ability to accumulate ABA to investigate its role in drought-induced dysfunction. All genotypes exhibited similar leaf and stem embolism resistance regardless of differences in ABA levels. Their leaf hydraulic resistance was also similar. Differences were only observed between the two extreme genotypes: sitiens (sit; a strong ABA-deficient mutant) and sp12 (a transgenic line that constitutively overaccumulates ABA), where the water potential inducing 50% embolism was 0.25 MPa lower in sp12 than in sit. Maximum stomatal and minimum leaf conductances were considerably lower in plants with higher ABA (wild type [WT] and sp12) than in ABA-deficient mutants. Variations in gas exchange across genotypes were associated with ABA levels and differences in stomatal density and size. The lower water loss in plants with higher ABA meant that lethal water potentials associated with embolism occurred later during drought in sp12 plants, followed by WT, and then by the ABA-deficient mutants. Therefore, the primary pathway by which ABA enhances drought resistance is via declines in water loss, which delays dehydration and hydraulic dysfunction.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
3229-3241Subventions
Organisme : U.S. Department of Agriculture
Organisme : National Science Foundation
ID : IOS-2140119
Informations de copyright
© 2023 The Authors. Plant, Cell & Environment published by John Wiley & Sons Ltd.
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