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Free proline accumulation is one of the most frequently reported metabolic modifications induced by different stresses in plants. In spite of this, the precise role of proline in stress physiology, as well as the metabolic adjustments associated with its biosynthesis, still remain matters of controversy. Still today, there is no definitive evidence for the adaptive value of proline itself under adverse conditions (Gibon et al., 2000). Nonetheless, many researchers continue being attracted to the study of free proline regarding its significance in the integrated metabolic response to stress in plants.