Pectinolytic and cellulolytic activities of heat resistant fungi and their macerating effects on mango and African mango
✍ Scribed by Ugwuanyi, J Obeta; Obeta, Jason A?N
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 86 KB
- Volume
- 79
- Category
- Article
- ISSN
- 0022-5142
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✦ Synopsis
Five heat resistant fungi (HRF), Neosartorya ®scheri, N ®scheri var spinosa, N quadricincta, Paecilomyces varioti and Byssochlamys nivea, were studied for production of pectinolytic and cellulolytic activities. All isolates produced considerable hydrolase, lyase and pectinesterase activities. Hydrolase activities were signi®cantly higher in fruit tissue (mango and African mango) media than in pectin medium (P `0.01) when assayed by both cup plate and viscometric methods. Activities produced in both fruit media were comparable in N ®scheri, N ®scheri var spinosa and P varioti but not in N quadricincta and B nivea. All isolates produced greater lyase activities in pectin medium than in fruit tissue media except for N quadricincta, while the converse was the case for pectinesterase. P varioti did not utilise carboxymethyl cellulose or produce cellulase activity. Other isolates produced cellulase with B nivea producing the greatest activity. Each isolate caused considerable maceration of arti®cially inoculated mango and African mango fruits, which is not directly related to measurable pectinase or cellulase. The possibility of co-operation between pectinase and cellulase activities in the disintegration of fruit tissues is discussed.