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Nitrogen Form Alters Hormonal Balance in Salt-treated Tomato (Solanum lycopersicum L.)

Ghanem, Michel Edmond and Martinez-Andujar, Cristina and Albacete, Alfonso and Pospisilova, Hana and Dodd, Ian C. and Perez-Alfocea, Francisco and Lutts, Stanley (2011) Nitrogen Form Alters Hormonal Balance in Salt-treated Tomato (Solanum lycopersicum L.). Journal of plant growth regulation, 30 (2). pp. 144-157. ISSN 0721-7595

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Abstract

Mixed nitrate/ammonium fertilization can partially alleviate the negative effects of salinity on growth of some plant species compared to all-nitrate or all-ammonium fertilization. To gain insights about the mechanisms involved, tomato (Solanum lycopersicum L. cv Moneymaker) plants were grown hydroponically for 3 weeks with two NO3 (-)/NH4 (+) fertilization regimes (6/0.5 and 5/1.5; N-total = 6.5 mM) in the absence (control) or presence of salt stress (100 mM NaCl). Ammonium enrichment had no effect on growth and other parameters under control conditions. Under salinity, however, ammonium enrichment improved shoot and root biomass by 20% and maintained leaf PSII efficiency close to control levels. These changes were related to higher leaf K+, NO3 (-), and NH4 (+) concentrations and activities of the N-assimilatory enzymes glutamate synthase (GOGAT) and glutamine synthase (GS) in the leaves. Ammonium enrichment also attenuated the salt-induced increase in leaf abscisic acid (ABA) concentration and decrease in leaf concentrations of indole 3-acetic acid (IAA) and the cytokinins trans-zeatin (tZ) and trans-zeatin riboside (tZR). Enhanced cytokinin status was probably due to maintenance of root-to-shoot cytokinin transport and decreased leaf induction of the cytokinin-degrading enzyme cytokinin oxidase/dehydrogenase (CKX) under ammonium-enriched conditions. It is concluded that nitrogen form modifies salinity-induced physiological responses and that these modifications are associated with changes in plant hormone status.

Item Type: Article
Journal or Publication Title: Journal of plant growth regulation
Uncontrolled Keywords: Abscisic acid ; Ammonium ; Cytokinin ; Indole-3-acetic acid ; Nitrate ; Nitrogen metabolism ; Plant hormones ; Salt stress ; Sodium chloride ; Tomato (Solanum lycopersicum L.) ; trans-Zeatin ; trans-Zeatin riboside ; PHOSPHOENOLPYRUVATE CARBOXYLASE ACTIVITY ; GLUTAMATE-DEHYDROGENASE ; NITRATE REDUCTASE ; LEAF SENESCENCE ; GENE-EXPRESSION ; WATER-DEFICIT ; ABSCISIC-ACID ; XYLEM SAP ; SALINITY ; PLANTS
Subjects: UNSPECIFIED
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 50438
Deposited By: ep_importer_pure
Deposited On: 19 Oct 2011 14:52
Refereed?: Yes
Published?: Published
Last Modified: 06 Sep 2013 22:47
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/50438

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