Recovery capacity of the edible halophyte Crithmum maritimum from temporary salinity in relation to nutrient accumulation and nitrogen metabolism

Autor: Ahlem Ben Khedher, Chiraz Chaffei Haouari, Abdallah Attia, Rihab Ben Fattoum, Chokri Zaghdoud, Houda Gouia
Rok vydání: 2016
Předmět:
Zdroj: Biologia. 71:1345-1352
ISSN: 1336-9563
0006-3088
DOI: 10.1515/biolog-2016-0158
Popis: Here, the reversibility effects of salinity on Crithmum maritimum L. (Apiaceae), a perennial local oilseed halophyte that was recently suggested as a cash crop for biosaline agriculture, were checked by monitoring a number of parameters in pre-stressed plants and then, replaced in normal conditions. Plants previously grown for 15 days on basic medium were treated for one month by increasing NaCl concentrations (0, 100, 200 and 300 mM), or for three weeks by 300 mM NaCl and then put back again for a week on basic culture medium without salinity (R). Results revealed that C. maritimum was able to tolerate 100 mM NaCl concentration in the culture medium following an efficient N assimilation in roots and osmotic adjustment in leaves and roots. However, from 200 mM NaCl treatment, a significant and progressive reduction in plant growth was observed, mainly due to salt ions-induced limitations of mineral nutrient acquisition and N-assimilating enzymes (NR and GS) in both organs rather than osmotic effects. Interestingly, a one week of 300 mM NaCl elimination allowed C. maritimum plants to achieve their normal growth status through a partial dilution of Na+ and Cl− effects on nutrients, osmotically compatible solutes, and activities of N-assimilating enzymes to levels similar to that obtained under 100 mM NaCl. Taken together, it was concluded that a temporary exposition of C. maritimum to salt stress is not necessary followed by significant depreciation in product yield and quality, which highlighted the reversibility effects of salinity on this plant species.
Databáze: OpenAIRE
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