title: Glufosinate-ammonium reduces growth and aflatoxin B1 production by Aspergillus flavus.
abstract: The herbicide glufosinate-ammonium (GA) [butanoic acid, 2-amino-4-(hydroxymethylphosphinyl)-ammonium salt] was tested at concentrations from 2 to 2,000 g GA per ml for activity against growth and aflatoxin B1 (AFB) production by the mycotoxigenic fungus Aspergillus flavus Link:Fr. The highest concentration (2,000 microg GA per ml) reduced colony diameter of A. flavus strain AF13 by 80%. AFB1 production was inhibited by 90% at this concentration. Reduction in mycelial dry weight and AFB1 production in response to GA application ranged from 17.2 to 97.1% and from 39.1 to 90.1%, respectively. Of four concentrations tested, 2 microg GA per ml was weakly inhibitory. In the kernel screening assay, AFB1 production was inhibited 60 to 91% when kernels were preimmersed or immersed 5 days after incubation in 200 microg GA per ml. Both concentrations (2 and 200 microg GA per ml) reduced seed germination by 25 to 50%. Results indicate that GA has an inhibitory effect on growth and AFB1 production by A. flavus.
authors.affiliation: Department of Plant Pathology and Crop Physiology, Louisiana State University Agricultural Center, Baton Rouge, 70803, USA.
authors.forename: K M
authors.initials: KM
authors.lastname: Tubajikat
authors.forename: K E
authors.initials: KE
authors.lastname: Damann
mesh_terms: D016604:Aflatoxin B1 / Q000096:biosynthesis*; D000613:Aminobutyrates / Q000494:pharmacology*; D001231:Aspergillus flavus / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D015169:Colony Count, Microbial; D004305:Dose-Response Relationship, Drug; D005516:Food Microbiology; D006540:Herbicides / Q000494:pharmacology*; D013997:Time Factors; D003313:Zea mays / Q000382:microbiology
chemical_list: D000613:Aminobutyrates; D006540:Herbicides; C003121:phosphinothricin; D016604:Aflatoxin B1