Influence of irrigation on the distribution and control of the nematode Meloidogyne javanica by the biocontrol bacterium Pasteuria penetrans in the field |
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| Authors: | Kounbobr Roch Dabiré Saliou Ndiaye Jean-Luc Chotte Sabine Fould Mamadou Thiam Diop Thierry Mateille |
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| Institution: | (1) Programme Coton, Station de Farako-Bâ, INERA, BP 208, Bobo-Dioulasso, Burkina-Faso;(2) Productions Végétales, ENSA, BP A 26, Thiès, Sénégal;(3) Laboratoire de Bio-Pédologie, UR IRD 41, BP 1386, IRD Bel-Air, Dakar, Senegal;(4) UMR CNRS 5557, Laboratoire d Ecologie Microbienne, Université Lyon 1, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne Cedex, France;(5) UMR 1062 Biologie et Gestion des Populations, CBGP/IRD, Campus International de Baillarguet, CS30016, 34988 Montferrier-sur-Lez Cedex, France;(6) Present address: IRSS/Centre Muraz, BP 390, Bobo-Dioulasso, Burkina-Faso |
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| Abstract: | Pasteuria penetrans, a bacterial parasite of plant-parasitic nematodes, is used to control root-knot nematode Meloidogyne spp. populations in vegetable crops. But its efficiency is variable, mostly because of the patchy distribution of the bacteria in arable fields. As the infective P. penetrans are non-motile bacteria in soil, abiotic soil factors can affect the bacteria–nematode relationships. An epidemiological study, conducted in a vegetable field, showed that abiotic factors such as irrigation, soil water holding capacity and texture, affected the efficiency of P. penetrans. A correspondence analysis between these abiotic factors and the density of P. penetrans spores in the soil, and the proportion of Meloidogyne javanica juveniles infected by the bacteria, revealed that irrigation affected directly the distribution of the spores in soil pores related to their passive transport by water flow. Laboratory experiments conducted on the passive transport of spores confirmed that intensive irrigation leached the spores down the soil profile and decreased the percentage of infected Meloidogyne juveniles. |
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| Keywords: | Biocontrol Irrigation Meloidogyne javanica Pasteuria penetrans Soil structure |
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