We investigated the growth and physiological responses of the submerged aquatic plant species Vallisneria natans (Lour.) Hara to 80 mg Lp>-1p> manganese (Mn) with different doses of ascorbic acid (AsA 0, 5, 10, 20, 50, 100, 200 mg Lp>-1p>) after 21 days of treatment. Mn stress