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ARTÍCULO
TITULO

Mitigating effect of salicylic acid and nitrate on water relations and osmotic adjustment in maize, cv. Lluteño exposed to salinity.

Hugo Escobar    
Richard Bustos    
Felipe Fernández    
Henry Cárcamo    
Herman Silva    
Nicolás Frank    
Liliana Cardemil    

Resumen

We analyzed the mitigating effect of NO3 - and salicylic acid (SA) on the detrimental effects of salt stress by studying the water status of plants of maize grown in Hoagland´s medium with NaCl 100 mM as the saline component, to which SA and NO3 - were added in different concentrations as mitigating agents. We evaluated water potential (?w), osmotic potential (?s), relative water content (RWC), turgor potential (?p), and the osmotic adjustment (OA) of leaves and roots. SA 0.5 mM mitigated the effects of salinity by increasing the ?w of the leaf, the ?s of the root, the ?p of the leaf, RWC and OA of the leaf; while NO3 - was only effective in combination with SA, mitigating the effects of salinity by increasing RWC and OA. However, the interaction SA-NO3 - reduced leaf ?w and ?s of leaves and roots. Mitigation of salt stress was also detected by a positive effect on plant growth. The greatest effect on growth was produced by the NO3 - treatments and SA 0.5 mM combined with NO3-.  Se evaluó el efecto mitigante de NO3 - y AS sobre el deterioro fisiológico inducido por salinidad en plantas de maíz crecidas en solución Hoagland con 100 mM de NaCl. La evaluación se realizó mediante determinaciones del potencial hídrico (?w), potencial osmótico (?s), contenido relativo de agua (RWC), potencial de turgor (?p) y el ajuste osmótico (AO). A la solución de Hoagland con 100 mM de NaCl se adicionó AS, NO3 - y combinaciones de diferentes concentraciones de ambos mitigadores. AS 0.5 mM puede mitigar el efecto de la salinidad incrementando el ?w de la hoja, ?s de la raíz, el ?p de la hoja, el RWC y el AO de la hoja. El NO3 - 6 mM solo y la interacción AS-NO3 - 6 mM puede mitigar el efecto salino incrementando el RWC y el AO. Sin embargo, la interacción AS-NO3 - 6 mM disminuye el ?w de la hoja y el ?s de hojas y raíces. La mitigación del estrés salino puede ser detectada, también, por un efecto positivo en el crecimiento de la planta. El mayor efecto en el crecimiento fue obtenido cuando las plantas fueron tratadas con NO3 - 6 mM y con AS 0.5 mM combinado con NO3 - 6 mM.

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