Germinación, tiempo hídrico y análisis isotópico de Vicia villosa Roth. bajo condiciones de estrés hídrico y salino
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Vicia villosa es un recurso forrajero potencial en áreas marginales asociado con su resiembra natural y sus atributos agronómicos. Los objetivos del trabajo fueron registrar y analizar el patrón de absorción de agua, determinar el porcentaje de germinación, estimar los parámetros de tiempo hídrico y establecer la composición isotópica de 13C y 15N de la plántula cuando Vicia villosa germina en condiciones de estrés hídrico y salino. Los ensayos para determinar el patrón de absorción y la respuesta a la germinación se realizaron según el tratamiento: control (agua destilada) y soluciones con potencial agua (Ya): -0,3; -0,6; -0,8; -1 y -1,2 MPa. Los osmolitos fueron poliethylene glicol (PEG) y cloruro de sodio (NaCl). La composición isotópica de la materia orgánica total (MOT) se determinó en condiciones control, -0,8 y -1,0 MPa. La absorción de un 125 % de agua desencadenó la germinación. Se estimó que con Ya de -0,6 y -0,8 MPa se alcanzaría un 90 % de germinación en estrés hídrico y salino. Los tratamientos de PEG y NaCl mostraron un enriquecimiento en 13C y un empobrecimiento en 15N respecto al control. Los resultados experimentales indican que esta especie es más tolerante a la salinidad que al estrés hídrico.
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