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首页> 美国政府科技报告 >Effects of a Lignin Peroxidase-Expressing Recombinant, 'Streptomyces lividans' TK23.1, on Biogeochemical Cycling and the Numbers and Activities of Microorganisms in Soil
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Effects of a Lignin Peroxidase-Expressing Recombinant, 'Streptomyces lividans' TK23.1, on Biogeochemical Cycling and the Numbers and Activities of Microorganisms in Soil

机译：木质素过氧化物酶表达重组链霉菌（streptomyces lividans）TK23.1对土壤生物地球化学循环及微生物数量和活性的影响

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摘要

A recombinant actinomycete, Streptomyces lividans TK23.1, expressing a pIJ702-encoded extracellular lignin peroxidase gene cloned from the chromosome of Streptomyces virodosporus T7A, was released into soil in flask- and microcosm-scale studies to determine its effects on humification and elemental cycling, and on the numbers, types, and activities of microorganisms native to the soil. The results of the study confirmed the previous findings and showed that additional effects were measurable upon release of the recombinant strain TK23.1 into unamended soil and into soil amended with lignocellulose. In addition to a transient enhancement of carbon mineralization, the recombinant affected soil pH, the rate of incorporation of carbon into soil humus fractions, nitrogen cycling, the relative populations of some microbial groups, and also certain soil enzyme activities. Whereas the survival or persistence in soil of both the recombinant TK23.1 strain and its parent, TK23, were similar, the observed effects on microbial numbers, types, and activities were recombinant-specific and did not occur when the parental strain was released into soil.

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