The duckweed Lemna minor recovers following 7, 14, 21, and 28 day exposures to atrazine at environmental concentrations
AbstractWe characterized the ability of the duckweed Lemna minor to recover from 7, 14, 21, and 28-day exposures to the herbicide atrazine. Static renewal assays were performed for each duration (with an exposure series of 0, 10, 20, 40, 80, 160 and 320 Âµg/L atrazine) followed by a 7-day recovery period in clean media. We observed full recovery (no statistical difference from control) in dry mass, frond number, and plant number growth rates at concentrations typically found in the environment ( â‰¥80 Âµg/L atrazine), regardless of the exposure duration. The USEPA currently regulates atrazine on an aquatic plant Concentration Equivalent Level of Concern of 10 Âµg/L (60-day average concentration) and our data support this decision.
Proceedings of Manitoba's Undergraduate Science and Engineering Research by University of Manitoba is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License. The authors hold the copyright to published articles without restriction, and retain publishing rights.Â