RESPONSES OF FIVE SOIL-BORNE FUNGI TO TOXICITY OF THREE LOCALLY SYNTHESIZED DYES

Ejiro Akponah

Abstract


Toxicity of three new and locally synthesized dyes 3,5- dimethoxypyrimidine azo-6-methyl uracil (Dye 1);  4-ethyl 5,2,3-thiazole azo-6-methyl uracil (dye 2) and 5-ethoxybenzothiazole azobenzoloxyphenol (dye 3) to five soil borne fungi: Aspergillus niger, Fusarium sp, Trichoderma viride, Alternaria alternate and Penicillium chrysogenum was investigated. Result showed mycelia extension decreased with increase in dyes concentrations (at 0.1, 1.0, 10 and 100 mg/L). At 0.1mg/L, mycelia extensions were 11.5, 13.2, 22.9, 15.8 and 15.5 (mm) for T.  viride, A. alternate, P. chrysogenum A. niger and Fusarium sp. respectively. Lower mycelia lengths of 5.5mm (T.  viride), 3.17mm (A. alternate),2.55 mm ( P. chrysogenum), 14.5mm (A. niger) and 12.5mm ( Fusarium sp) were observed at highest concentration of 100mg/L . While response of five fungi to dyes did not differ, mycelia extension decreased with concentrations for all dyes (p ≤ 0.05). Additionally, A. niger and Fusarium sp  displayed capabilities of decolourizing  representative dye (dye 3) selected for decolourization test. At the end of a four day exposure period, percentage decolourization of dye at concentrations of 0.1,1.0, 10 and 100 mg/L were 60, 60.97, 19.96 and 10.26 (%) respectively. Decolourization abilities and the adaptation of mycelia growth to toxic pressure of dyes, suggest possible roles soil fungi could play in ameliorating effects of these dyes upon discharge into the environment.

Key words: Fungi, Dye, Toxicity, Decolourization


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