Poonkothai, M2017-01-232017-01-232015https://ir.avinuty.ac.in/handle/avu/1098The present investigation was carried out to assess the decolourisation of reactive dye using Aspergillus niger and its impact on the growth of Zinnia ele'gans. The textile effluent spilled soil sample was assessed for the presence of fungus and screened for the decolourisation of reactive yellow dye. The fungal species, Aspergillus niger exhibited maximum decolourisation in the medium amended with 0.01 g of dye at pH 6.0 at 30°C. Inoculum concentration of 1% amended in the medium for 5 days exhibited maximum oercentage of decolourisation. Among the different carbon and nitrogen sources the maxi- '-rnnum decolourisation activity was observed in the medium supplemented with 1 % glucose and 0.3% ammonium chloride. Zinnia eiegans grown with microbially treated reactive yellow dye (T,) exhibited maximum biometric parameters, such as germination percentage, shoot length, root length, dry weight, fresh weight and vigour index when compared with control plants (T3). The plants grown with untreated reactive yellow dye (T^) recorded minimum growth when compared with T^ and control on 7th day after sowing.