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Occurence of Coprinus Lagopus (fr.): a Potential Weed Fungus as a Contaminant of Mushroom Cultivation in Bangladesh

Mohammad Anwar Hossain
National Mushroom Development and Extension Centre, Sobhanbag, Savar, Dhaka, Bangladesh

Abul Khair
Department of Botany, Jahangirnagar University, Savar, Dhaka, Bangladesh.

Saleh Ahmed
National Mushroom Development and Extension Centre, Sobhanbag, Savar, Dhaka, Bangladesh

Abstract/ Executive Summary:

Coprinus lagopus, a common weed fungus for mushrooms was found to occur in a mushroom farm at Savar, on sawdust based substrate prepared for spawn production of Pleurotus ostreatus. Various taxonomic characters and fruiting period, mode of reproduction, various types of propagules of this weed fungus have been studied thoroughly. Regenerative propagules such as oidia, sclerotia, basodiospore are commonly found. In addition, the whole tissue system of sporophore showed its highly regenerative capability on substrate used for mushroom cultivation.

Keywords: Coprinus lagopus, Weed fungus, Characterization, Propagules, Survivality.

Location: National Mushroom Development and Extension Centre, Savar, Dhaka, Bangladesh

Start Date:

End Date:

Program Area: Pest Management

Commodity: Mushroom, Weedicide

Objectives:

To fill up these lacunae of knowledge in the field of fungal weed science in Bangladesh.

Methodology:

For study of various biological characters, Coprinus lagopus occuring as a weed species was selected and its fructification period, mode of reproduction, germination behaviours were investigated. The propagules, both asexual (oidia, sclerotia) and sexual (basidiospore) parts which were able to reproduce new individuals were recorded to determine the mode of reproduction. Beyond common propagules, the fruit body and vegetative tissues of its all tissue system demonstrates as uncommon survivable propagule particularly on substrate like sawdust, straw rather than culture media.. The weed fungus Coprinus lagopus was collected from Ethnomushroom (pvt) Ltd, Savar, Dhaka. Fresh specimen was studied for taxonomic investigation and it was grown in pure culture on PDA medium in 125 ml Erlenmeyer flasks. The inoculum consisted of fragments of the vegetative mycelium. All cultures were maintained at room temperature (28-30^oC). Mature fruiting bodies were obtained in 8 to 12 days. The spore in the filtrate was washed with distilled water and concentrated by centrifugation at 4000 rpm using the centrifuge of Digisystem: DSC-200T (Taiwan). Prior drying collected spore was preserved at 4^oC in a refrigerator. The different propagules, both asexual and sexual parts which were able to produce new individuals were recorded to determine the mode of reproduction. The criterion of germination was the appearance of germ tube from the spore were observed under an Olympus ( Model CX 41) compound microscope. The number of spores germinated and counted and the percent of germination was calculated. Vegetative tissue of Coprinus lagopus was inoculated on sawdust based substrate. After fully colonization of packet, the expansion of fruit body was observed. Morphological and cultural characteres of Coprinus lagopus were observed microscopically in a zoom sterio microscope (Model SZ 61). Microscopic structures were measured by calibrating stage-micrometer with an oculo-micrometer. Photograph was taken with an Olympus DP 20 camera attaching with both compound and sterioscopic microscope.

Source of Information: Bangladesh J. Mushroom. 4(2): 67-74, 2010 (December)

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It was also recorded that the final rapid stage of expansion in many Agarics, eg Agaricus bisporus and Coprinus cenerius is almost entirely because of the extension of cells already laid down in the young primordium. Current observations indicate that C. lagopus is a potential weed of various mushrooms world wide. The C. logopus reduces mushroom yield by 57.6 %. Coprinus lagopus completes its life cycle in a shorter time than does even the straw mushroom. Coprinus lagopus taking only 1 week, whereas V. volvacia takes 9 to 10 days. Our study has been an evidence in Bangladesh that this weed fungus might be treat for our expanding mushroom cultivation and industry. Therefore proper attention and care to be paid for appropriate pasteurization and sterilization of the substrate used for developing spawn. Various taxonomic characters and fruiting period, mode of reproduction, various types of propagules of this weed fungus have been studied thoroughly. Regenerative propagules such as oidia, sclerotia, basodiospore are commonly found. In addition, the whole tissue system of sporophore showed its highly regenerative capability on substrate used for mushroom cultivation.

Knowledge Management: Journal