Growth of Arthrobotrys superba from a birch wood resource base into soil determined by radioactive tracing |
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Authors: | Persson Olsson Jansson |
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Institution: | Department of Microbial Ecology, Ecology Building, Lund University, S-223 62 Lund, Sweden;Department of Ecology and Molecular Biology, Royal Veterinary and Agricultural University, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Copenhagen, Denmark |
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Abstract: | The ability of a nematode-trapping fungus to establish in field soil is an important characteristic when considering its use as a biological control agent. The outgrowth of the nematode-trapping fungus Arthrobotrys superba from wood was recorded by labelling the fungus with (14)C]3-O-methylglucose and (32)P]orthophosphoric acid and by using the soil sprinkling method. The fungus reached a distance of 7-8 cm during 25 days in heat-treated (60 degrees C) soil, detected by either radioactive tracing or the soil sprinkling technique. The two labelled compounds were co-distributed at all sampling times (r(2)=0.946) which indicates that the glucose pool (as methylglucose) and phosphorus content were correlated throughout the mycelium. In natural, non-heat-treated soil the fungus reached a distance of 1.5 cm from one disc of birch wood after 30 days, while it reached 3.2 cm during the same period when the food base was a pile of five inoculated discs. The experiments showed, for the first time, that a nematophagous fungus, A. superba, can grow out into soil from a piece of wood and supported by nutrients translocated from the resource base to the edge of the mycelium. |
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Keywords: | Nematode-trapping fungus Arthrobotrys superba Radioactive tracing 14C 32P Food base size |
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