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

Full text not available from this repository.


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:
Journal Article
Journal or Publication Title:
Journal of Plant Growth Regulation
Uncontrolled Keywords:
ID Code:
Deposited By:
Deposited On:
19 Oct 2011 13:52
Last Modified:
21 Nov 2022 21:45