After 28 days of drought, watering led to a decrease in galactose content and an increase in glucose and more severely in salicin. This was already observed in [5] Populus delto¨ıdes after re-watering following a drought period and could be linked to a need of general osmotic adjustment, including carbohydrates and other molecules as proline, proline analogues, betaine [26] or ions, before the full recovery of the plant.