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Articles by J.A. Okhuoya
Total Records ( 4 ) for J.A. Okhuoya
  E.M. Ogbo and J.A. Okhuoya
  The effect of Pleurotus tuber-regium on the bioavailability of metallic elements in crude oil contaminated soils was investigated. The fungus was grown in crude oil contaminated soils amended with sawdust, shredded banana leaf blades, NPK-nitrogen, phosphorus and potassium and poultry litter. The soils were analyzed for heavy metal content; total and exchangeable (Fe, Mn, Co, Ni, Zn, Cu, Pb, Cr, Cd, Hg and As). The mushroom caused dissolution of the metallic elements analyzed for, increasing concentration of heavy metals in their bio-available states. The addition of cellulosic wastes and fertilizers to crude oil contaminated soils affected the ability of the fungus to release metals from their bound states. The substrates with poultry litter recorded the highest bioavailability factor and control soils that had no fungal treatment recorded the least. Metals like nickel and iron recorded low bioavailability factors both in crude oil contaminated soils without and with fungal treatment. Other metals like manganese and cobalt recorded high bioavailability factors in soils with or without the mushroom. In conclusion the growth of the fungus Pleurotus tuber-regium in crude oil contaminated soil caused the release of metals into their bio-available states. The solubilization of metals by the fungus was affected by substrate composition with poultry litter having the highest impact on solubility of metals. The fungus can be used for heavy metal harvesting of some metals from contaminated sites. Pleurotus tuber-regium has the potential of increasing metal toxicity in soils by increasing the bioavailability of some metals needed in trace quantities.
  E.M. Ogbo and J.A. Okhuoya
  In this study, the fate of Pleurotus tuber-regium harvested from crude oil contaminated substrates is investigated with regard to the bio-absorption of heavy metals specifically-Fe, Mn, Co, Ni, Zn, Cu, Pb, Cr, Cd, Hg and As. The fungus was grown in crude oil contaminated soils amended with poultry litter, NPK-fertilizer, sawdust and shredded banana leaf blades. Harvested fruit bodies were digested with acids and heavy metal content determined. The metallic element content of contaminated soil was low for elements analyzed for with reference to recommended limits for them in normal soils. The only metal that was relatively higher than permissible concentration in soil was chromium. The contaminated soil was deficient of essential metallic elements like Zn, Mn and Cu. There was further reduction of these metallic elements caused by their uptake by the fungus. Cadmium, mercury and arsenic were not detected in the soils and fruit bodies of the mushroom. The transfer of metals from the soils to the mushroom varied with type of metal, its concentration and substrate composition. The transfer factor of the various metals varied from 10.47 in zinc to 0.31 in iron. Fruit bodies from substrates with poultry litter accumulated Fe, Pb and Cr to toxic levels. Mushrooms harvested from crude oil contaminated sites should be analyzed before consumption and properly disposed by incineration or recycling if concentration of metals is too high. The fungus can be used as a bio-indicator of heavy metal pollution and fungal remediated sites can be augmented with micronutrients.
  O.O. Osemwegie , J.A. Okhuoya , A.O. Oghenekaro and G.A. Evueh
  Permanent plots in rubber plantations and a lowland forest, each measuring 25x25 m, were randomly laid out using coloured ribbons and studied twice a month for macrofungi for a period of 14 months. A total of 435 fruit bodies belonging to 93 different species of macrofungi were encountered, 70% of which were identified. Identified taxa were distributed into 4 Classes, 9 Orders and 28 Families with the class Hymenomycetes and family Tricholomataceae as the best represented taxa. Agaric (52%) and polypores mushrooms (31%) were also recorded as the best represented life-forms while wood-based substrates recorded 70% of the total mushroom taxa encountered during the study. The species richness and diversity estimate of 100 randomization accumulation sample order of mushroom abundance data from each of the sampled plots showed that the forest (Plot E) had the best species richness and diversity index values compared to plot A, B, C and D.
  O.O. Osemwegie and J.A. Okhuoya
  A study of mushrooms associated with oil palm agroforests in Edo State, South-South of Nigeria was undertaken. A total of 49 fruit bodies belonging to 26 different species of mushrooms in the divisions Ascomycota and Basidiomycota, class Gasteromycetes, Discomycetes, Hymenomycetes were recorded from the study. The order Agaricales, family Tricholomataceae and genus Marasmius were the most abundant and commonly represented taxa. Palm Fronds (PF) supported the highest number of mushroom taxa (19%) followed by Fallen Palm Tree (FPT), Fruit Bunch (FB) and Decomposing Palm Litters (DPL) each of which supported 14% of the total species of mushrooms recorded during the study. Mushrooms irrespective of their functional role as natural decomposers were recognised by the study as pivotal to sustainable local agroforest management practices in Nigeria. Oil palm plantations surveyed during the study competes favourably with forests as sources of indigenous utility mushrooms.
 
 
 
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