Chemotaxis can take plant-parasitic nematodes to the source of a chemo-attractant via the shortest possible routes
- 29 October 2010
- journal article
- Published by The Royal Society in Journal of The Royal Society Interface
- Vol. 8 (57), 568-577
- https://doi.org/10.1098/rsif.2010.0417
Abstract
It has long been recognized that chemotaxis is the primary means by which nematodes locate host plants. Nonetheless, chemotaxis has received scant attention. We show that chemotaxis is predicted to take nematodes to a source of a chemo-attractant via the shortest possible routes through the labyrinth of air-filled or water-filled channels within a soil through which the attractant diffuses. There are just two provisos: (i) all of the channels through which the attractant diffuses are accessible to the nematodes and (ii) nematodes can resolve all chemical gradients no matter how small. Previously, this remarkable consequence of chemotaxis had gone unnoticed. The predictions are supported by experimental studies of the movement patterns of the root-knot nematodes Meloidogyne incognita and Meloidogyne graminicola in modified Y-chamber olfactometers filled with Pluronic gel. By providing two routes to a source of the attractant, one long and one short, our experiments, the first to demonstrate the routes taken by nematodes to plant roots, serve to test our predictions. Our data show that nematodes take the most direct route to their preferred hosts (as predicted) but often take the longest route towards poor hosts. We hypothesize that a complex of repellent and attractant chemicals influences the interaction between nematodes and their hosts.This publication has 39 references indexed in Scilit:
- Determination of Preferred pH for Root-knot Nematode Aggregation Using Pluronic F-127 GelJournal of Chemical Ecology, 2009
- Hatch and host location.Published by CABI Publishing ,2009
- Rotation Crop Evaluation for Management of the Soybean Cyst Nematode in MinnesotaAgronomy Journal, 2006
- Insect host location: a volatile situationTrends in Plant Science, 2005
- Recruitment of entomopathogenic nematodes by insect-damaged maize rootsNature, 2005
- Electrophysiological analysis of the response of males of the potato cyst nematode, Globodera rostochiensis, to fractions of their homospecific sex pheromoneParasitology, 1997
- Recent advances in pore scale models for multiphase flow in porous mediaReviews of Geophysics, 1995
- Host Recognition Behavior by Entomopathogenic Nematodes during Contact with Insect Gut ContentsJournal of Parasitology, 1993
- Isolation and identification of a compound from soybean cyst nematode,Heterodera glycines, with sex pheromone activityJournal of Chemical Ecology, 1989
- Responses of plant-parasitic nematodeMeloidogyne incognita to carbon dioxide determined by video camera-computer trackingJournal of Chemical Ecology, 1987