Abscisic acid acts essentially on stomata, not on xylem, to improve drought resistance in tomato

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dc.contributor.authorHaverroth, Eduardo J.
dc.contributor.authorOliveira, Leonardo A.
dc.contributor.authorAndrade, Moab T.
dc.contributor.authorTaggart, Matthew
dc.contributor.authorMcAdam, Scott A. M.
dc.contributor.authorZsögön, Agustin
dc.contributor.authorThompson, Andrew J.
dc.contributor.authorMartins, Samuel C. V.
dc.contributor.authorCardoso, Amanda A.
dc.date.accessioned2023-08-15T11:30:36Z
dc.date.available2023-08-15T11:30:36Z
dc.date.issued2023-08-01
dc.description.abstractDrought 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.en_UK
dc.identifier.citationHaverroth EJ, Oliveira LA, Andrade MT, et al., (2023) Abscisic acid acts essentially on stomata, not on xylem, to improve drought resistance in tomato. Plant, Cell and Environment, Volume 46, Issue 11, November 2023, pp. 3229-3241en_UK
dc.identifier.issn0140-7791
dc.identifier.urihttps://doi.org/10.1111/pce.14676
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/20089
dc.language.isoenen_UK
dc.publisherWileyen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectembolism resistanceen_UK
dc.subjecthydraulic vulnerabilityen_UK
dc.subjectminimum leaf conductanceen_UK
dc.subjectSolanum lycopersicumen_UK
dc.subjectwater deficiten_UK
dc.subjectwater lossen_UK
dc.titleAbscisic acid acts essentially on stomata, not on xylem, to improve drought resistance in tomatoen_UK
dc.typeArticleen_UK

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