Multi-analytical approach reveals potential microbial indicators in soil for sugarcane model systems [electronic resource]

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Tác giả:

Ngôn ngữ: eng

Ký hiệu phân loại: 630.1 Agriculture and related technologies

Thông tin xuất bản: Argonne, Ill. : Oak Ridge, Tenn. : Argonne National Laboratory ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2015

Mô tả vật lý: Size: e0129765 : , digital, PDF file.

Bộ sưu tập: Metadata

ID: 261147

 This study focused on the effects of organic and inorganic amendments and straw retention on the microbial biomass (MB) and taxonomic groups of bacteria in sugarcane-cultivated soils in a greenhouse mesocosm experiment monitored for gas emissions and chemical factors. The experiment consisted of combinations of synthetic nitrogen (N), vinasse (V
  a liquid waste from ethanol production), and sugarcane-straw blankets. Increases in CO<
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 2<
 /sub>
 -C and N<
 sub>
 2<
 /sub>
 O-N emissions were identified shortly after the addition of both N and V to the soils, thus increasing MB nitrogen (MB-N) and decreasing MB carbon (MB-C) in the N+V-amended soils and altering soil chemical factors that were correlated with the MB. Across 57 soil metagenomic datasets, <
 i>
 Actinobacteria<
 /i>
  (31.5%), <
 i>
 Planctomycetes<
 /i>
  (12.3%), <
 i>
 Deltaproteobacteria<
 /i>
  (12.3%), <
 i>
 Alphaproteobacteria<
 /i>
  (12.0%) and <
 i>
 Betaproteobacteria<
 /i>
  (11.1%) were the most dominant bacterial groups during the experiment. Differences in relative abundance of metagenomic sequences were mainly revealed for <
 i>
 Acidobacteria<
 /i>
 , <
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 Actinobacteria<
 /i>
 , <
 i>
 Gammaproteobacteria<
 /i>
  and <
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 Verrucomicrobia<
 /i>
  with regard to N+V fertilization and straw retention. Differential abundances in bacterial groups were confirmed using 16S rRNA gene-targeted phylum-specific primers for real-time PCR analysis in all soil samples, whose results were in accordance with sequence data, except for <
 i>
 Gammaproteobacteria<
 /i>
 . <
 i>
 Actinobacteria<
 /i>
  were more responsive to straw retention with <
 i>
 Rubrobacterales<
 /i>
 , <
 i>
 Bifidobacteriales<
 /i>
  and <
 i>
 Actinomycetales<
 /i>
  related to the chemical factors of N+V-amended soils. <
 i>
 Acidobacteria<
 /i>
  subgroup 7 and <
 i>
 Opitutae<
 /i>
 , a verrucomicrobial class, were related to the chemical factors of soils without straw retention as a surface blanket. Taken together, the results showed that MB-C and MB-N responded to changes in soil chemical factors and CO<
 sub>
 2<
 /sub>
 -C and N<
 sub>
 2<
 /sub>
 O-N emissions, especially for N+V-amended soils. The results also indicated that several taxonomic groups of bacteria, such as <
 i>
 Acidobacteria<
 /i>
 , <
 i>
 Actinobacteria<
 /i>
  and <
 i>
 Verrucomicrobia<
 /i>
 , and their subgroups acted as early-warning indicators of N+V amendments and straw retention in sugarcane-cultivated soils, which can alter the soil chemical factors.
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