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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

Nutritional and physiological responses of the dicotyledonous halophyte Sarcocornia fruticosa to salinity

Pedro García-Caparrós A , Alfonso Llanderal A , Maribela Pestana B , Pedro José Correia B and María Teresa Lao A C
+ Author Affiliations
- Author Affiliations

A Agronomy Department of Higher Polytechnic School and Experimental Science College, University of Almeria, Agrifood Campus of International Excellence ceiA3. Ctra. Sacramento s/n, La Cañada de San Urbano, 04120, Almería, Spain.

B Universidade do Algarve, MeditBio, FCT, Edifício 8, Campus de Gambelas, 8005-139 Faro, Portugal.

C Corresponding author. Email: mtlao@ual.es

Australian Journal of Botany 65(7) 573-581 https://doi.org/10.1071/BT17100
Submitted: 1 June 2017  Accepted: 6 October 2017   Published: 9 November 2017

Abstract

Sarcocornia fruticosa (L.) A.J. Scott is a dicotyledonous halophyte that grows in areas with an arid climate such as the marshes of southern Spain. The species has potential uses for saline agriculture and biofuel production, but the effects of salt stress on its nutrition and physiology remain unclear. Plants of S. fruticosa were grown in pots with a mixture of sphagnum peat-moss and Perlite. In order to evaluate the effects of different levels of salinity, five treatments using different NaCl concentrations (10 (control), 60, 100, 200 and 300 mM NaCl) were applied over a period of 60 days. At the end of the experiment, the dry weight, the biomass allocation and the tissue water content were measured for each salinity treatment. The net uptake of various nutrients and their translocation rates were calculated for each salt treatment. Salt loss, shedding of plant parts and succulence in shoots were evaluated together with the K+/Na+ ratio, K-Na selectivity, concentrations of osmolytes and their estimated contributions to the osmotic potential. Our results showed that S. fruticosa can maintain its major physiological processes at 60 mM NaCl without significant dry weight reduction. Higher salinity resulted in negative values for net uptake and translocation rates from roots to shoots of N and P. As might be predicted from other dicotyledonous halophytes, S. fruticosa plants increased Cl and Na+ uptake using both as osmotica instead of organic osmolytes. However, to survive salinity, this species has also evolved others mechanisms such as shedding old shoots, increased succulence in shoots at higher salt concentrations and the ability to maintain a lower K+/Na+ ratio and higher K-Na selectivity in all organs.

Additional keywords: osmotic pressure, plant nutrient acquisition, salinity, salt stress.


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