Exogenous spermidine enhanced Pb tolerance in Salix matsudana by promoting Pb accumulation in roots and spermidine, nitric oxide, and antioxidant system levels in leaves
Keywords: APX; ascorbate peroxidase; ASA; reductive ascorbate; BAFs; bioaccumulation factors; CAT; catalase; GPX; glutathione peroxidase; GR; glutathione reductase; GSH; reductive glutathione; H2O2; hydrogen peroxide; MDA; malondialdehyde; NO; nitric oxide; Put; pu