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In their natural habitat, plants are continuously challenged by adverse environmental conditions. Among them, cold stress (CS) is a major environmental factor limiting agricultural productivity and geographic distribution (Chinnusamy et al., 2007). In this respect, chilling (15-0°C) and freezing (<0°C) stress should be distinguished (Thomashow, 2010). CS responses at the cellular level are characterized by an extensive reprogramming of gene expression and metabolic fluxes (Stitt and Hurry, 2002; Miura and Furumoto, 2013). Clearly, these modifications are mainly linked to the onset of tolerance mechanisms, which ultimately lead to acclimation. Several metabolites are known to contribute to this process, including amino acids, polyamines, polyols, and soluble sugars (Krasensky and Jonak, 2012 and references therein). Among them, particular focus was recently given to understand the multifunctional role of soluble sugars in enhancing cold tolerance (Nagele and Heyer, 2013).

Cold tolerance triggered by soluble sugars: a multifaceted countermeasure