Peng Xingxing, Lu Jianjun, Li Chenglan
2009
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Journal
Journal of Northwest A&F University
Abstract
[Objective] The study was done to isolate the effective fungi strains for biodegrading bensulfuron-methyl,one of the most widely used herbicides in China,and provide prospect candidate biological preparations for reducing sulfonylurea herbicide residues in the soil.[Method] The degrading fungi were isolated in Czapek media from poor nutrient or serious contaminated soil collected from several provinces in China,and then screened in the media of bensulfuron-methyl as only carbohydrate.The effective degrading fungi were determined according to the degrading rate and the morphology and the degradation characteristics were preliminarily identified.[Result] A bensulfuron-methyl highly effective degradation fungus strain BP-H-01 with above 80% of relative degradation rate to 25-500 mg/L of bensulfuron-methyl,which was screened from 78 fungi and bacteria strains,tolerated 500 mg/L of bensulfuron-methyl. Based on morphological study,BP-H-01 was identified as Aspergillus sp.The optimum conditions for degrading Bensulfuron-methyl were pH 7.5,28 ℃ and 2 g/L of the inoculated quantity respectively.In this condition,the degradation rate achieved 84.5%.[Conclution] Fungus strain BP-H-01 can biodegrade remarkably bensulfuron-methyl specially.