Effects of tannin-rich host plants on the infection and establishment of the entomopathogenic nematode Heterorhabditis bacteriophora

Journal of Invertebrate Pathology
I GlazerSergeYan Landau

Abstract

Parasitized animals can self-medicate. As ingested plant phenolics, mainly tannins, reduce strongyle nematode infections in mammalian herbivores. We investigated the effect of plant extracts known to be anthelmintic in vertebrate herbivores on the recovery of the parasitic entomopathogenic nematode Heterorhabditis bacteriophora infecting African cotton leafworm (Spodoptera littoralis). Nematode infective juveniles (IJs) were exposed to 0, 300, 900, 1200, 2400 ppm of Pistacia lentiscus L. (lentisk), Inula viscosa L. (strong-smelling inula), Quercus calliprinos Decne. (common oak) and Ceratonia siliqua L. (carob) extracts on growth medium (in vitro assay). In control treatments, 50-80% of IJs resumed development to J4, young and developed adult hermaphrodites, whereas all extracts, except for C. siliqua at 300 ppm, impaired IJ exsheathment and development. The highest concentration of I. viscosa extract (2400 ppm) had the strongest effect, killing 95% of exposed nematodes. Surviving nematodes did not recover, remaining at the IJ stage. Over the whole cycle, I. viscosa extract inhibited recovery to 25% or less, and did not allow full development to adulthood, whereas 65% of IJs in the control treatment recovered and resumed develo...Continue Reading

References

Apr 5, 2003·Applied and Environmental Microbiology·Todd A Ciche, Jerald C Ensign
Jul 29, 2005·Nature·Elizabeth A Bernays, Michael S Singer
Apr 25, 2006·Trends in Parasitology·Hervé HosteSimone O Hoskin
Sep 28, 2006·Journal of Agricultural and Food Chemistry·Severine Brunet, Herve Hoste
May 4, 2007·Current Biology : CB·Elissa A HallemPaul W Sternberg
May 22, 2010·Trends in Parasitology·Hervé HosteIan Beveridge

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Citations

Feb 21, 2016·Journal of Invertebrate Pathology·Selcuk HazirDawn Olson

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