Megafol®treatment was performed on Day 0, by sprayinghomogenously a 2 mL per liter solution over the leaves. Megafol®is a mixture of amino acids (proline and tryptophan), glycosides,polysaccharides, organic nitrogen and organic carbon (Para–dikovi´cet al., 2011). The apparatus used to spray the plants was a 6 L agri-cultural pressure sprayer (VOLPI).