Degradation of dieldrin to carbon dioxide by a soil fungusTrichoderma koningi
Degradation of dieldrin to carbon dioxide by a soil fungusTrichoderma koningi
复制标题
土壤真菌康宁木霉将狄氏剂降解为二氧化碳
DOI：
10.1007/bf01796853
复制
发表时间：
1971
影响因子：
2.7
通讯作者：
F. Matsumura
中科院分区：
文献类型：
--
作者：
M. Bixby;G. Boush;F. Matsumura
狄氏剂是最持久的氯代烃杀虫剂之一，近年来有报告称狄氏剂被多种不同的微生物分解。已知能将狄氏剂降解为几种代谢产物的细菌有苹果蛆的共生菌-黑霉假单胞菌（2），其他假单胞菌属，和几种芽孢杆菌属，从狄氏剂污染的土壤中分离出一种真菌，绿色木霉（4）。另一种土壤真菌-交替毛霉在两天内将该化合物分解了26%，但没有发现代谢物（i）。在分类学上与Trichoderma konin $ i密切相关的四株绿色木霉被发现将该杀虫剂水解为6，7-反式-二羟基二氢艾氏剂（5）。这种降解产物也是由产气好氧菌从狄氏剂中产生的（9）。从土壤假单胞菌中鉴定出几种代谢产物。（六）、对这种细菌的进一步研究表明，标记在氯化碳上的狄氏剂同位素没有放射性。这种假单胞菌显然降解了狄氏剂分子的非氯代部分，而不是氯代碳环。
The breakdown of dieldrin, one of the most persistent of the chlorinated hydrocarbon insecticides, by a number of different microorganisms has been reported in recent years. Bacteria known to degrade dieldrin to several metabolites are Pseudomonas melophthora, a symbiote of the apple maggot (2), other Pseudomonas sp., and several Bacillus sp., isolated from dieldrin contaminated soils as well as the fungus, Trichoderma viride (4). Mucor alternans, another soil fungus, showed twenty-six percent breakdown of the compound in two days, but no metabolites were identified (i).Attempts have been made to understand the possible detoxification of dieldrin through the identification of some of these metabolites. Four strains of Trichoderma viride, closely related taxonomically to Trichoderma konin $ i, were found to hydrolyze this insecticide to 6, 7-trans-dihydroxydihydroaldrin (5). This degradation product was also produced from dieldrin by the bacterium, Aerobacter aerogenes (9). Several metabolites were identified from a soll Pseudomonas sp.(6). Further studies with this bacterium demonstrated no evolution of radioactivity from the dieldrin isotope labeled on the chlorinated carbons. This Pseudomonas sp. apparently degraded the nonchlorinated segment of the dieldrin molecule and not the chlorinated carbon ring.