无机营养物竞争在底物混合物生物降解中的作用。
Role of competition for inorganic nutrients in the biodegradation of mixtures of substrates.
作者信息
Steffensen W S, Alexander M
机构信息
Department of Soil, Crop and Atmospheric Sciences, Cornell University, Ithaca, New York 14853, USA.
出版信息
Appl Environ Microbiol. 1995 Aug;61(8):2859-62. doi: 10.1128/aem.61.8.2859-2862.1995.
A study was conducted to determine whether competition for inorganic nutrients affects the biodegradation of mixtures of substrates. Little benzylamine was mineralized by Pseudomonas putida in solutions with no added P, but the substrate was degraded if the medium contained 100 nM P. The enhancement by P addition did not occur if the medium also contained caprolactam and a caprolactam-utilizing strain of Pseudomonas aeruginosa. The suppression by the second bacterium was overcome by a higher P concentration. The rate of caprolactam utilization by P. aeruginosa was reduced if benzylamine and P. putida were also present in media with 100 nM P, but the suppression was absent if the solution contained a higher P concentration. Glutamate increased and inorganic N plus P decreased the length of the acclimation phase prior to benzylamine mineralization in lake water. We suggest that the effect of one biodegradable substrate on the metabolism of a second often results from a competition for inorganic nutrients.
开展了一项研究以确定无机养分的竞争是否会影响底物混合物的生物降解。在未添加磷的溶液中，恶臭假单胞菌对苄胺的矿化作用微弱，但如果培养基中含有100 nM的磷，则该底物会被降解。如果培养基中还含有己内酰胺和一株利用己内酰胺的铜绿假单胞菌，添加磷的促进作用就不会出现。第二种细菌的抑制作用可通过更高的磷浓度来克服。在含有100 nM磷的培养基中，如果同时存在苄胺和恶臭假单胞菌，铜绿假单胞菌利用己内酰胺的速率会降低，但如果溶液中磷浓度更高，则不存在抑制作用。在湖水中，谷氨酸增加而无机氮加磷会缩短苄胺矿化之前的适应期。我们认为，一种可生物降解底物对另一种底物代谢的影响通常源于对无机养分的竞争。
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