Combined toxic effects of anatoxin-a and microcystin-LR on submerged macrophytes and biofilms.

•ANTX-a and MCLR could be effectively absorbed by Vallisneria natans.•An antagonistic effect on plant was elicited by combined ANTX-a and MCLR exposure.•More abscisic acid and strigolactone was generated as defense to ANTX-a and MCLR.•N-acylated-l-homoserine lactone content alters with varying biofilm quorum-sensing.