Volume 15, Number 3, September 2008Xth European Multicolloquium of Parasitology (EMOP-10, Paris, August 24-28, 2008)
|Page(s)||310 - 316|
|Published online||15 September 2008|
Xth EMOP, August 2008
Plant-nematode interactions: environmental signals detected by the nematode’s chemosensory organs control changes in the surface cuticle and behaviour
Nematode Interactions Unit, Rothamsted Research, Harpenden, AL5 2JQ, UK
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Plant parasitic nematodes have developed the capacity to sense and respond to chemical signals of host origin and the ability to orientate towards plant roots enhances the nematode’s chance of survival. Root exudates contain a range of compounds which mediate belowground interactions with pathogenic and beneficial soil organisms. Chemical components of root exudates may deter one organism while attracting another and these compounds alter nematode behaviour and can either attract nematodes to the roots or result in repellence, motility inhibition or even death. In vitro, plant signals present in root exudates, trigger a rapid alteration of the surface cuticle of Meloidogyne incognita and the same changes were also induced by indole-acetic acid (IAA). IAA binds to the chemosensory organs of M. incognita and it is possible that IAA acts as a signal that orientates the nematode on the root surface in the rhizosphere and/or inside the root tissue and thereby promotes nematode infection.
Key words: Meloidogyne spp. / indole-acetic acid / plant signals / cuticle / amphids
© PRINCEPS Editions, Paris, 2008, transferred to Société Française de Parasitologie
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