摘要：For a better understanding of the metabolic adaptations to sulfonamide
(SA) stress in submerged macrophytes, the alterations
of nutrient element uptake and secondary metabolism were
studied in the leaves of Vallisneria natans (Lour.) Hara exposed to
0 and 50 mg/L of SA for 15 d. The results showed that, under a
treatment of 50 mg/L SA, the malondialdehyde and superoxide
anion (O2
) contents in V. natans leaves significantly increased,
1.77–3.32 times higher than the control group, respectively, while
the chlorophyll concentration showed a 36.99% reduction at the
end of experiment. Simultaneously, V. natans showed a removal
effect on SA and SA dramatically affected the nutrient removal
efficiency by V. natans. Our results suggest that high SA levels
can damage V. natans tissue and in turn that results in a stimulation
of the antioxidant response. V. natans significantly improved
the removal efficiency of SA, meanwhile SA resulted in less
removal of TN and TP from the water column.
关键词：Sulfonamides ; Vallisneria natans (Lour.) Hara ; antioxidant system
