Cellulase Induction in Three Aspergillus Species Isolated From Artemisia annua L. Plantation Soil Using Different Cellulose Substrates

A. I. Ogbonna, P. O. Nwadiaro, A. Chuku, C. I. C. Ogbonna, F. C. Onwuliri


This study was aimed at isolation and screening of fungal species associated with Artemisia annua Plantation soils from one of the under studied areas in Plateau state, Nigeria for cellulase activity. A total of thirteen fungal species were isolated from various locations within the A. annua Plantation and were screened for cellulase production. Agar plate assay was carried out using basal medium supplemented with 1% Carboxymethylcellulose (CMC) powder and staining with 0.1% Congo red solution after the incubation period. Among these species, Aspergillus fumigatus, A. niger and A. terreus were more predominant and were recorded as cellulase producing species. They have shown to possess cellulose degrading ability and exhibited maximum zones of hydrolysis on Carboxymethylcellulose medium and were selected for enzyme assay using submerged fermentation (SmF). Enzyme production was analyzed by Dinitrosalicylic acid (DNSA) methods and the enzymes assayed for were CMCase (β-1,4-endoglucanase), β-glucosidase and FPase (total cellulose) using Carboxymethylcellulose, cellulose acetate and Filter paper as substrates respectively. The highest cellulase activity was observed on the 3rd day in A. niger with enzyme production of 0.045IU/ml and 0.040IU/ml on CMC and filter paper media respectively. A. fumigatus had high enzyme activity of 0.037IU/ml and 0.025IU/ml on filter paper and cellulose acetate media respectively. Highest enzyme production of 0.034IU/ml was recorded for A. terreus on the 3rd day on cellulose acetate medium. These fungal species could be employed specially to perform in situ environmental applications involving cellulose biodegradation of wastes.

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DOI: https://doi.org/10.5296/jab.v3i1.6738


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