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International Journal of Soil Science
  Year: 2006 | Volume: 1 | Issue: 1 | Page No.: 8-19
DOI: 10.3923/ijss.2006.8.19
 
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The Ectomycorrhizosphere Effect Influences Functional Diversity of Soil Microflora

Ramanankierana Naina, Rakotoarimanga Nirina , Thioulouse Jean , Kisa Marija , Randrianjohany Emile , Ramaroson Luciano and Duponnois Robin

Abstract:
The aims of this study were to determine whether the microbial activities in soil compartments are influenced by ectomycorrhizal symbiosis and to determine the functional diversity of fluorescent pseudomonads associated with the symbiosis of Uapaca sp. and ectomycorrhizal fungi. Uapaca sp. seedlings were cultured in soils collected under ectomycorrhizal tree species. After 8 months culturing, the soil highly colonized by hyphal stands (hyphosphere soil, HS), as well as the non colonized soil (bulk soil, BS) was sampled from each pot. The non-mycorrhizal and mycorrhizal short roots with their adherent soil were collected and vigorously shacked, to recover the Rhizosphere Soil (RS) and the Mycorrhizosphere Soil (MS). The patterns of in situ catabolic potential (ISCP) of microbial communities have been measured and the results showed that functional activities of soil microbial communities are mainly dependent on fungal activities. In addition, this effect is different between the hyphosphere and mycorrhizosphere zones. The number of fluorescent pseudomonads was significantly more numerous in the HS, MS and RS compartments than in the bulk soil. The highest size of fluorescent pseudomonad population was in the Hyphosphere Soil (HS) compartment. The ectomycorrhizal symbiosis has also modified the functional activities of fluorescent pseudomonads. This fungal qualitative effect was mainly detected in the hyphosphere soil compartment on the ability of fluorescent pseudomonads to solubilize tricalcium orthophosphate and to produce lipases. Close interactions occur between the ectomycorrhizal symbiosis and the soil bacterial communities that could increase the efficiency of the fungal symbiosis for the host plant development.
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How to cite this article:

Ramanankierana Naina, Rakotoarimanga Nirina , Thioulouse Jean , Kisa Marija , Randrianjohany Emile , Ramaroson Luciano and Duponnois Robin , 2006. The Ectomycorrhizosphere Effect Influences Functional Diversity of Soil Microflora. International Journal of Soil Science, 1: 8-19.

DOI: 10.3923/ijss.2006.8.19

URL: https://scialert.net/abstract/?doi=ijss.2006.8.19

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