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Rapid osmotic adjustment in leaf elongation zone during polyethylene glycol application: Evaluation of the imbalance between assimilation and utilization of carbohydrates

This work aims to study rapid osmotic adjustment, in order to simplify and follow this mechanism with the changes of various sugars and potassium in parallel with growth and photosynthesis measurements. Four durum wheat varieties of Triticum turgidum subsp. durum L. designated as: “Inrat-var”, “MBB-var”, “OZ-var”, and “Waha-var” were growing in continuously aerated-nutrient-solutions. The kinetic of the leaf elongation for leaf 3 were measured by the linear variable differential transducer (LVDT); osmotic potential (OP), carbohydrates, and potassium (K+) concentrations. Growth recovered rapidly after a sudden full after stress. A considerable difference was noted in the recuperation (%) of the leaf elongation rate (LER) under the four varieties. The variation in the partial recuperation of LER was, therefore, associated with the aptitude of osmotic adjustment in the elongation zone (EZ) of the leaf growth. Osmotic adjustment is associated with soluble sugars and potassium accumulation. Compared to the accumulation of these solutes in the mature zone (MZ) and the photosynthesis process, several ideas related to this accumulation mechanism can be assumed among them, this accumulation process cannot be considered as a direct result of the reduction of the growth. Rather, it might be as the result of their mobilization from the MZ of growing leaf or other expanded leaves. The accumulation of these sugars probably is uncoupled with direct photosynthesis activity.