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Abstract
Salt stress is one of the major environmental constraints limiting agricultural productivity and influencing the concentration of bioactive compounds of vegetables. In this study, the effect of NaCl salt stress on nutrient contents of leaves in a cultivar of amaranth, an important leafy vegetable cultivated in some tropical regions worldwide, was evaluated. The experiment was carried out in a screen house at Center for Agricultural Research of Agonkanmey, Benin Republic as a randomized complete block design (RCBD) with three replications. Three weeks old plants were subjected in pots containing a mixture of potting soil and sand, to three concentrations (0, 30 and 90 mM) of NaCl by irrigation every two days. Nutrient contents in leaves were determined at maturity, after four weeks of stress, using standards methods. Proteins, total sugars, reducing sugars, lipids, potassium, calcium, vitamins C and B3 contents were not significantly affected by NaCl. Iron content increased significantly only at 30 mM NaCl but vitamins A, B1 and B2 contents increased significantly with increase in NaCl concentration. Thus, salt stress did not reduce nutritional values of this amaranth cultivar but improved its leaves nutritional quality by increasing vitamins A, B1 and B2 content. Key words: Amaranth, NaCl, proteins, lipids, sugars, mineral, vitamins.
Highlights
Amaranthus, collectively known as amaranth, is a cosmopolitan genus of annual or short-lived perennial plants
Since amaranths are mainly used in Benin as leafy vegetable, it is important to show if NaCl stress induced modification in leaves nutrient contents
The present study aims at evaluating NaCl stress effects on protein, sugar, lipid, mineral and vitamin concentrations of the main amaranth cultivar grown in Benin
Summary
Amaranthus, collectively known as amaranth, is a cosmopolitan genus of annual or short-lived perennial plants. Some amaranth species are cultivated as leafy vegetables which are essentially required to safeguard health, by precluding human diseases as they are good source of vitamins, mineral nutrients and antioxidants (Prasad et al, 2014). They exhibit a high nutritive value and a fascinating ability to adapt to diverse harsh environments (Omami et al, 2006). Since amaranths are mainly used in Benin as leafy vegetable, it is important to show if NaCl stress induced modification in leaves nutrient contents. The present study aims at evaluating NaCl stress effects on protein, sugar, lipid, mineral and vitamin concentrations of the main amaranth cultivar grown in Benin
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