title: Phytotoxicity assessment of atrazine on growth and physiology of three emergent plants.
abstract: The emergent plants Acorus calamus, Lythrum salicaria, and Scirpus tabernaemontani were exposed to atrazine for 15, 30, 45, and 60 days in a hydroponic system. Effects were evaluated investigating plant growth, chlorophyll (Chl) content, peroxidase (POD) activity, and malondialdehyde (MDA) content. Results showed that selected plants survived in culture solution with atrazine ≤8 mg L(-1), but relative growth rates decreased significantly in the first 15-day exposure. Chla content decreased, but MDA increased with increasing atrazine concentration. S. tabernaemontani was the most insensitive species, followed by A. calamus and L.salicaria. The growth indicators exhibited significant changes in the early stage of atrazine exposure; subsequently, the negative impacts weakened and disappeared. Plant growth may be more representative of emergent plant fitness than physiological endpoints in toxicity assessment of herbicides to emergent plants.
authors.affiliation: Beijing Research and Development Center for Grass and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, People's Republic of China, qinghaiw@sina.com.
authors.forename: Qinghai
authors.initials: Q
authors.lastname: Wang
authors.forename: Xiaoe
authors.initials: X
authors.lastname: Que
authors.forename: Ruilun
authors.initials: R
authors.lastname: Zheng
authors.forename: Zuo
authors.initials: Z
authors.lastname: Pang
authors.forename: Cui
authors.initials: C
authors.lastname: Li
authors.forename: Bo
authors.initials: B
authors.lastname: Xiao
mesh_terms: D029023:Acorus / Q000254:growth & development; D001280:Atrazine / Q000633:toxicity*; D002734:Chlorophyll; D006540:Herbicides / Q000633:toxicity*; D018527:Hydroponics; D031561:Lythrum; D063245:Plant Development; D010944:Plants / Q000187:drug effects*; D014874:Water Pollutants, Chemical / Q000633:toxicity
chemical_list: D006540:Herbicides; D014874:Water Pollutants, Chemical; D002734:Chlorophyll; D001280:Atrazine