Antimicrobial activity of endophytic fungi isolated from the mangrove plant Sonneratia apetala (Buch.-Ham) from the Sundarbans mangrove forest

Endophytic fungi reside in the intercellular space of plant nourished by the plant. In return, they provide bioactive molecules which can play critical roles on plant defense system. Fifty six endophytes were isolated from the leaves, root, bark and fruits of Sonneratia apetala, a pioneer mangrove plant in the Sundarbans, Bangladesh. A total of 56 isolates were obtained and 12 different species within 8 genera were identified using morphological and molecular characteristics. Antimicrobial activity of Ethyl Acetate (EtOAc) and Methanolic (MeOH) extracts of these 12 different species were analyzed by resazurin assay and the Minimum Inhibitory Concentrations (MICs) were determined. The fungal extracts showed antimicrobial activities against more than one tested bacterium or fungus among 5 human pathogenic microbes, i.e. Escherichia coli NCTC 12241, Staphylococcus aureus NCTC 12981, Micrococcus lutus NCTC 7508, Pseudomonas aeruginosa NCTC 7508 and Candida albicans ATCC 90028. Overall, Methanolic extracts showed greater activity than that of Ethyl Acetate extracts. Of the isolates identified, Colletotrichum gloeosporioides, Aspergillus niger and Fusarium equiseti were the most active isolates and showed activity against microorganisms under investigation. Methanolic extracts of C. gloeosporioides and A. niger showed the lowest MIC (0.0024 mg/mL) against Pseudomonas aeruginosa. The study indicates that endophytic fungi isolated from S. apetala species posses potential antimicrobial properties, which could be further investigated

Economics and Employment Generation of Bamboo-Based Enterprises: A Case Study from Eastern Bangladesh

In the last decade non-timber forest products (NTFPs) and their associated goods have received much attention from researchers and development workers for their perceived socio-economic importance and potential, particularly in developing countries. It has been increasingly recognized that promoting the use, production and sustainable harvesting of such kinds of products could also contribute to forest conservation in the long run. However, since the development process has progressed in most regions, alternatives or substitutes of such products have become available on the markets, and it will be difficult for these nature-based products to exist without additional product values. A market survey was conducted in an urban fringe of north-eastern Bangladesh to investigate NTFP-based product diversity, and marketing patterns and challenges. Further information was collected from sellers and consumers to understand their views on probable future strategies to sustain the markets of these products. A total of 38 NTFP and NTFP-based secondary products were recorded from 25 NTFP shops, including 16 permanent, 7 temporary (or semi-permanent) and 2 mobile shops. The greatest demand was observed for bamboo and cane-based products, for which supply suffered due to the scarcity of raw materials. A decreasing trend in the consumption of NTFP-based articles for urban domestic use was also reported from the sellers. To cope with the competitive markets, sellers were found to place more emphasis on creative marketing, durability and appearance of their products. The study concluded that active government support is needed for the sustenance of this industry in a changing global perspective. This could be in the form of technical advancement in the production process, improvement of existing product supply chains and skill development of the workers which will not only secure the future of these products but also provide an essential means for the survival of this industry and for thousands of people living from it. © 2010 Steve Harrison, John Herbohn