African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12278

Full Length Research Paper

The effects of exotic weed Flaveria bidentis with different invasion stages on soil bacterial community structures

Chaohe Huangfu
  • Chaohe Huangfu
  • Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin, 300191, China.
  • Google Scholar
Huiyan Li
  • Huiyan Li
  • Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin, 300191, China.
  • Google Scholar
Xinwei Chen
  • Xinwei Chen
  • Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin, 300191, China.
  • Google Scholar
Hongmei Liu
  • Hongmei Liu
  • Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin, 300191, China.
  • Google Scholar
Dianlin Yang*
  • Dianlin Yang*
  • Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin, 300191, China.
  • Google Scholar


  •  Received: 22 April 2015
  •  Accepted: 31 August 2015
  •  Published: 02 September 2015

Abstract

A new exotic weed, Flaveria bidentis, is spreading in central China where it forms dense monospecific patches modifying the structure of different native ecosystems and threatening native aboveground biodiversity. However, little is known about the consequences of such an invasion for soil bacterial community, especially its effect pattern at different invasion stages. In this study, soil samples were taken in native ecosystems that were uninvaded, partially invaded (transition), and severely invaded by F. bidentis. The bacterial richness and diversity in F. bidentis in rhizospheres soil was evaluated using denaturing gradient gel electrophoresis (DGGE) analysis. Different stages of F. bidentis invasion can trigger changes in soil physicochemical properties in particularly in available N and P F. bidentis invasion significantly decreased the richness of soil bacterial community, and the decline contents were positively correlated with invasion progress. In the invaded soils, bacterial species in Proteobacteria, Chloroflexi and Actinomycetes decreased with invasion, with the greatest reduction in relative abundance occurring for Proteobacteria, which was the dominant species in the native soils. Invasion of F. bidentis corresponded with an alteration in the structure of soil bacterial community, and soil microbial biomass as well, thus soil environment modification was expected to promote spreading of this exotic weeds in turn.

Key words: Biological invasion, Flaveria bidentis, soil nutrients, soil bacteria, polymerase chain reaction denaturing gradient gel electrophoresis (PCR-DGGE).

Abbreviation

MBC, Microbial biomass carbon; MBN, microbial biomass nitrogen.