Enantioselective effects of herbicide imazapyr on Arabidopsis thaliana
Journal
Journal of Environmental Science and Health - Part B Pesticides, Food Contaminants, and Agricultural Wastes
Journal Volume
49
Journal Volume
49
Journal Issue
9
Journal Issue
9
Pages
646-653
Start Page
646
End Page
653
ISSN
03601234
Date Issued
2014-09
Author(s)
Abstract
The enantioselective toxicity of chiral herbicides in the environment is of increasing concern. To investigate the enantioselective effects of the chiral herbicide imazapyr on target organisms, we exposed Arabidopsis thaliana to imazapyr enantiomers and racemate. The results show that imazapyr was enantioselectively toxic to A. thaliana. The total chlorophyll content in A. thaliana was affected more by (+)-imazapyr than (±)-imazapyr and (-)-imazapyr. Concentrations of proline and malondialdehyde reflected a toxic effect in the order of (+)-imazapyr > (±)-imazapyr > (-)-imazapyr at every concentration. Acetolactate synthase (ALS) activity was inhibited more by (+)-imazapyr than (±)-imazapyr or (-)-imazapyr. At 100 mg L-1 of imazapyr, ALS activity was 78%, 43%, and 19% with (-)-, (±)-, and (+)-imazapyr, respectively. The results suggest the significant enantioselective toxicity of imazapyr in A. thaliana for greater toxicity with (+)-imazapyr than (±)-imazapyr and (-)-imazapyr, which suggests that (+)-imazapyr has more herbicidal effect.
Subjects
acetolactate synthase (ALS)
Arabidopsis thaliana
enantioselectivity
imazapyr
Imidazolinones
Publisher
Taylor and Francis Inc.
Type
journal article