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Overproduction of ABA in rootstocks alleviates salinity stress in tomato shoots
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Martínez‐Andújar, Cristina, Martínez‐Pérez, Ascensión, Albacete, Alfonso, Martínez‐Melgarejo, Purificación A., Dodd, Ian C., Thompson, Andrew J., Mohareb, Fady, Estelles‐Lopez, Lucia, Kevei, Zoltan, Ferrández‐Ayela, Almudena, Pérez‐Pérez, José Manuel, Gifford, Miriam L. and Pérez‐Alfocea, Francisco (2021) Overproduction of ABA in rootstocks alleviates salinity stress in tomato shoots. Plant, Cell & Environment, 44 (9). pp. 2966-2986. doi:10.1111/pce.14121
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Official URL: https://doi.org/10.1111/pce.14121
Abstract
To determine whether root‐supplied ABA alleviates saline stress, tomato (Solanum lycopersicum L. cv. Sugar Drop) was grafted onto two independent lines (NCED OE) overexpressing the SlNCED1 gene (9‐cis‐epoxycarotenoid dioxygenase) and wild type rootstocks. After 200 days of saline irrigation (EC = 3.5 dS m−1), plants with NCED OE rootstocks had 30% higher fruit yield, but decreased root biomass and lateral root development. Although NCED OE rootstocks upregulated ABA‐signalling (AREB, ATHB12), ethylene‐related (ACCs, ERFs), aquaporin (PIPs) and stress‐related (TAS14, KIN, LEA) genes, downregulation of PYL ABA receptors and signalling components (WRKYs), ethylene synthesis (ACOs) and auxin‐responsive factors occurred. Elevated SlNCED1 expression enhanced ABA levels in reproductive tissue while ABA catabolites accumulated in leaf and xylem sap suggesting homeostatic mechanisms. NCED OE also reduced xylem cytokinin transport to the shoot and stimulated foliar 2‐isopentenyl adenine (iP) accumulation and phloem transport. Moreover, increased xylem GA3 levels in growing fruit trusses were associated with enhanced reproductive growth. Improved photosynthesis without changes in stomatal conductance was consistent with reduced stress sensitivity and hormone‐mediated alteration of leaf growth and mesophyll structure. Combined with increases in leaf nutrients and flavonoids, systemic changes in hormone balance could explain enhanced vigour, reproductive growth and yield under saline stress.
| Item Type: | Journal Article | ||||||||||||
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| Subjects: | Q Science > QH Natural history Q Science > QK Botany S Agriculture > SB Plant culture |
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| Divisions: | Faculty of Science > Life Sciences (2010- ) | ||||||||||||
| SWORD Depositor: | Library Publications Router | ||||||||||||
| Library of Congress Subject Headings (LCSH): | Abscisic acid, Plant hormones, Roots (Botany) , Gene Expression, Tomato -- Rootstocks, Plants -- Effect of salts on | ||||||||||||
| Journal or Publication Title: | Plant, Cell & Environment | ||||||||||||
| Publisher: | John Wiley & Sons, Ltd. | ||||||||||||
| ISSN: | 1365-3040 | ||||||||||||
| Official Date: | September 2021 | ||||||||||||
| Dates: |
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| Volume: | 44 | ||||||||||||
| Number: | 9 | ||||||||||||
| Page Range: | pp. 2966-2986 | ||||||||||||
| DOI: | 10.1111/pce.14121 | ||||||||||||
| Status: | Peer Reviewed | ||||||||||||
| Publication Status: | Published | ||||||||||||
| Access rights to Published version: | Open Access | ||||||||||||
| RIOXX Funder/Project Grant: |
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