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Growth of mycorrhized seedlings of a tropical gum tree in Copper-contaminated soil

The effect of Arbuscular Mycorrhizal Fungus (AMF) inoculation, on tropical gum tree (Sterculia setigera) grown in copper (Cu) contaminated soils was studied. Treatments consisted of inoculation or not with Glomus fasciculatum and the addition of (Cu) to soil at the concentrations of 0, 200, 400, 600 and 800 mg/kg. In contaminated soil, higher mycorrhizal colonization was observed at 0, 200, and 400 mg/kg Cu addition levels in AMF inoculated plants. AMF plants were able to survive from 200 to 600 mg/kg level whereas non AMF plants were affected at 400 mg/kg Cu addition. However at 800 mg/kg all the plants died. Root colonization rates were significantly lower at 600 mg/kg Cu. In all Cu treatments shoot and root dry weights were higher in non mycorrhizal plants than mycorrhizal plants. AMF inoculation lead to a threshold effect on root colonization and survival rate with Cu addition levels. Growth improvement of AMF plants was observed in polluted soil up to 600 mg/kg Cu. Biomass enhancement by arbuscular mycorrhiza fungi may protect plants under moderately Cu-contaminated soil.

Auteur(s) : M. Ndiaye, Cavalli E., Diop T.A.
Pages : 14-20
Année de publication : 2012
Revue : Plants & Environment
N° de volume : 1
Type : Article
Mise en ligne par : NDIAYE Malick