Resumo

MELONI, Diego Ariel. Physiological responses to calcium supplementation of NaCl-stressed vinal (Prosopis ruscifolia G.) seedlings. Rev. Fac. Cienc. Agrar., Univ. Nac. Cuyo [online]. 2012, vol.44, n.2, pp.79-88. ISSN 1853-8665.

Vinal (Prosopis ruscifolia G.) is a highly-tolerant to saline stress species of forest-importance native to the Western Chaco Phytogeographical Region. The aim of this paper was to test the hypothesis that supplementing vinal seedlings with CaSO₄ lowers their concentration of toxic ions and increases proline concentration allowing for osmotic adjustment. The seedlings were cultivated in a 25% Hoagland solutions whether adding 0.4 mol L^-1 of NaCl or not, and whether supplementing it with 5 or 10 mmol L^-1 of CaSO₄ or not. Both dry matter, mineral composition, relative water content and proline and soluble sugar concentrations were determined. A totally randomized experimental design was used with five repetitions and the results analyzed with ANOVA and the Tukey test. The results obtained endorse the protecting role of Ca⁺² by maintaining Ca⁺², K+, and Mg⁺² concentrations in tissues; the Na⁺ absorption inhibition; and the osmotic adjustment by synthesizing osmocompatible solutes.

Palavras-chave : Prosopis ruscifolia; Mineral nutrition; Water relations; Osmotic adjustmen.

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