Abstract

MOHAMED, KAMEL. IMPROVING THE TOLERANCE OF Vicia faba AGAINST ENVIRONMENTAL SALINITY RESULTED FROM THE IRRIGATION WITH SEA WATER BY USING KNO₃ AND (NH₄)₂SO₄ AS CHEMICAL OSMOREGULATORS. Acta biol.Colomb. [online]. 2012, vol.17, n.2, pp.295-308. ISSN 0120-548X.

The familiar solutes, Na⁺, K⁺, Ca²⁺, Mg²⁺, Cl^-, PO₄^3-, SO₄^2-, soluble carbohydrates, amino acids and soluble proteins, which play a role in osmotic adjustment were estimated to investigate the role of potassium nitrate and ammonium sulphate as osmoregulators and their effects on the solutes composition. Vicia faba L. was cultivated and irrigated with 5, 10, 15 and 20 % (v:v) sea water. The plants were divided to three groups. The first was irrigated with sea water only. The second was treated with 5 mM KNO₃ while the third was treated with 5mM (NH₄)₂SO₄. The plants were left to grow until flowering stage. The results indicated that the non treated group increased the soluble carbohydrates in the roots to avoid the influx of sodium. The treatment with KNO₃ decreased the sodicity (SAR) while (NH₄)₂SO₄ treatment decreased the SK:Na value in the shoots at higher salinity. The availability of nitrogen as nitrate or ammonium ions enhances the accumulation of soluble carbohydrates in shoots. The plants of all groups were depended on Ca²⁺, as compatible solute more than Na⁺, and K⁺.

Keywords : Osmoregulation; irrigation; salinity; sea water; Vicia faba.

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