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Interaction of nematodes with nematophagus fungi: induction of trap formation, attraction and detection of attractants

Geeta Saxena, R. Dayal, K.G. Mukerji
DOI: http://dx.doi.org/10.1111/j.1574-6968.1987.tb02408.x 319-327 First published online: 1 December 1987


Induction of trap formation in Arthrobotrys oligospora, A. conoides and Monacrosporium cystosporum was studied during a 24 h period in the presence of the free-living nematodes Panagrellus redivivus on various nutrient media. A definite pattern of trap formation was observed in these fungi. Low nutrient mineral salt medium had the most pronounced effect on trap formation. Attraction and repulsion of P. redivivus towards these three nematophagous and three non-nematophagous fungi was studied. The nematodes were attracted towards three nematophagous and one non-nematophagous fungi, the other two repelled them. Attractants of the nematophagous fungi were determined by thin-layer chromatography. In the case of A. oligospora and M. cystosporum, four spots were traced, whereas in A. conoides, five spots were detected.

Key words
  • Trap formation
  • Morphogenesis
  • Attractant
  • Low nutrient salt medium
  • Nematode
  • Nematophagous fungus

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