An endogenous rhythm of trap formation in the nematophagous fungus Arthrobotrys oligospora |
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Authors: | Gernot Lysek Birgit Nordbring-Hertz |
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Institution: | (1) Institut für Systematische Botanik und Pflanzen-Geographie der Freien Universität Berlin, Altensteinstr. 6, D-1000 Berlin 33, Germany;(2) Department of Microbial Ecology, University of Lund, Ecology Building, Helgonavägen 5, S-22362 Lund, Sweden |
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Abstract: | In the predacious fungus Arthrobotrys oligospora Fres., the number and distribution of traps formed after the addition of living nematodes to the colonies were determined. At 21°C the traps were formed periodically; the mean period was 42.3±0.8 h. The periodicity was independent of light-dark (LD) cycles of 24 h (10:14). Temperature influenced the hyphal elongation but did not affect the periodic trap formation; at lower temperatures the peaks of trap formation were close together, showing partial overlapping. Induction of rhythmic mycelial growth and conidiation by chemical means was effective only in LD-cycles. The latter diurnal rhythm was weakly correlated with the trap formation and did not affect the endogenous period of approximately 42 h.Abbreviations LD
light-dark
- DD
continuous darkness
- LNM
low-nutrient medium
- CMA
corn meal agar |
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Keywords: | Arthrobotrys Endogenous rhythm Fungi prodocious Nematophagous fungi Trap formation |
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