Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Occurrence of Vesicular-Arbuscular Mycorrhizal (VAM) Fungi and Their Effect on Plant Growth in Endangered Vegetations

  • Selvaraj, Thangaswamy (Research Institute of Agricultural Sciences, Sunchon National University, Centre for Advanced Studies in Botany, University of Madras) ;
  • Padmanabhan, Chellappan (Centre for Advanced Studies in Botany, University of Madra) ;
  • Jeong, Yu-Jin (Department of Agricultural Chemistry, Sunchon National University) ;
  • Kim, Hoon (Department of Agricultural Chemistry, Sunchon National University, Research Institute of Agricultural Sciences, Sunchon National University)
  • Published : 2004.08.01
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Abstract

A survey for vesicular-arbuscular mycorrhizae (VAM) occurrence was undertaken in three endangered vegetation sites in the area of Kudankulam atomic power station. Fifteen VAM fungal species were isolated from the root-zone soils of fourteen different plant species. There was a significant correlation observed between the number of spores and of percentage root colonization as exemplified by Phyllanthus niruri and Paspalum vaginatum (450, 95%; 60, 25%). Although VAM species are not known to be strictly site specific, the fact that Acaulospora elegans was observed only in site 1, Glomus pulvinatum in site 2 only, and Gl. intraradices in site 3 only, showed site-specificity in this study. To confirm the infection efficiency, two host plant species in the sites, P. niruri and Eclipta alba, were selected and inoculated in field with three selected VAM fungal spores. Gl. fasciculatum was found to be the most efficient VAM species in percentage root colonization, number of VAM spores, and dry matter content. When the nutrients in roots of P. niruri and E. alba were analyzed, there was higher uptake of K (4.2 and 3.4 times, respectively) and Ca (5.3 and 4.9 times, respectively), the analogues for $^{137}Cs$ and $^{90}Sr$, respectively. From the results, it might be concluded that VAM association helps the plants survive in a disturbed ecosystem and enhances uptake and cycling of radionuclides from the ecosystem.

Keywords

References

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