The yield of Lemna minor was a very sensitive parameter, as it responded to even the lowest tetracycline concentration.
The greatest changes induced by tetracycline were observed in the content of biogenic amines.
Tetracycline present in water increases the content of biogenic amines in Lemna minor.
Spermine and tyramine are the most sensitive to tetracycline and putrescine and spermidine are the least affected.