Implications des communautés bactériennes ferri-réductrices et des paramètres environnementaux dans le fonctionnement et la qualité des sols de rizières (Thaïlande et Côte d'Ivoire)

Abstract : This work was performed to define the role of iron reducing bacteria (IRB) on the iron mobilization in two types of paddy fields presented different environmental problems. One is affected by salinity and received organic matter (Thailand) and the other by ferrous toxicity (Ivory Coast). Different approaches were adopted to characterize soil and water properties and determine in experiments populations and activities of IRB. Main parameters involved are salinity, rhizosphere, organic matter and iron bacterial reducing activities. Furthermore, the study of the structure of bacterial populations was done using molecular biology (PCR-TTGE). In Thai paddy soils, the results show that salinity limit bacterial communities proliferation. But the addition of organic matter improves bacterial growth and activities and remediates rice production. Bacterial populations observed in saline and non saline condition, presented halotolerant (Clostridium beijerinckii ; Bacillus sp. ; Oceanobacillus sp., Shewanella sp.), halophile (Virgibacillus, Alkaliphilus metalliredigens, Bacillus megaterium), or halosensitive characteristic, allowing the activity of bacterial communities in different medium conditions. In Ivory Coast paddy soils, the environmental conditions are more reducing with the presence of a large community of sulphate-reducing bacteria (Desulfovribrio desulfuricans). A large diversity of iron reducing communities, predominantly fermentative bacteria (Bacillus sp.), seems to contribute efficiently to iron reduction and solubilization. Iron reducing bacterial activity deleterious in Ivory Coast but beneficial in Thailand, appears as a parameter and indicator of the quality of paddy soil.
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Affi Jeanne Bongoua Devisme. Implications des communautés bactériennes ferri-réductrices et des paramètres environnementaux dans le fonctionnement et la qualité des sols de rizières (Thaïlande et Côte d'Ivoire). Sciences agricoles. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10071⟩. ⟨tel-01748391⟩

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