Metabolic changes associated with cold-acclimation in contrasting cultivars of barley [Gitane, Onice]

aba acide abscissique acide gras carbohydrate content cold contenido de carbohidratos cultivos de invierno cultivos de primavera culture d'hiver culture de printemps durcissement endurecimiento fatty acids frio froid frost gel hardening helada hordeum vulgare lipid content prolina proline resistencia a la temperatura spring crops temperature resistance teneur en glucides teneur en lipides variedades varieties winter crops