title: [Effects of Bt corn straw insecticidal proteins on enzyme activities of Eisenia fetida].
abstract: Bacillus thuringiensis (Bt) proteins released from Bt corn can enter soil ecosystem via returning straw into field, root exudation, and pollen fluttering-down. In this study, the straws of Bt corn and its near-isogenic non-Bt line were added into soil with an application rate of 5% and 7.5% to breed Eisenia fetida, and the total protein content and the activities of acetylcholine esterase (AchE), glutathione peroxidase (GSH-PX), catalase (CAT), and superoxide dismutase (SOD) in E. fetida were determined after 7 and 14 days. Under the same application rate of the straws, the total protein content and GSH-PX activity of E. fetida decreased while the AchE, CAT, and SOD activities increased on the 14th day, compared with those on the 7th day. The Bt corn straw increased the SOD activity and decreased the AchE and GSH-PX activities, but had less effects on the total protein content and CAT activity, compared with non-Bt corn straw. All the results suggested that Bt corn straw had no inhibitory effect on E. fetida total protein but could inhibit the AchE and GSH-PX activities, and could not induce CAT activity but induce SOD activity within a short time.
authors.affiliation: Institute of Tropical and Subtropical Ecology, South China Agricultural University, Guangzhou 510642, China. shuyinghua@scau.edu.cn
authors.forename: Ying-hua
authors.initials: YH
authors.lastname: Shu
authors.forename: Hong-hui
authors.initials: HH
authors.lastname: Ma
authors.forename: Yan
authors.initials: Y
authors.lastname: Du
authors.forename: Jian-wu
authors.initials: JW
authors.lastname: Wang
mesh_terms: D000818:Animals; D001413:Bacillus thuringiensis / Q000378:metabolism; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000235:genetics*; D017753:Ecosystem; D004731:Endotoxins / Q000235:genetics*; D006460:Hemolysin Proteins / Q000235:genetics*; D009835:Oligochaeta / Q000187:drug effects / Q000201:enzymology*; D010572:Pest Control, Biological; D018547:Plant Stems / Q000235:genetics; D030821:Plants, Genetically Modified; D012988:Soil Microbiology; D003313:Zea mays / Q000235:genetics* / Q000378:metabolism
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D004731:Endotoxins; D006460:Hemolysin Proteins; C030956:insecticidal crystal protein, Bacillus Thuringiensis