Villain Luc, Baujard P., Molina Amauri, Pignolet Luc, Sarah Jean-Louis. 1998. Morphological and biological characterization of three Pratylenchus sp. populations parasitising coffee trees in Guatemala. Nematologica, 44 (5) : 600-601. International Nematology Symposium. 24, Dundee, Royaume-Uni, 4 Août 1998/9 Août 1998.
Autre titre : Caractérisation biologique et morphologique de trois populations de Pratylenchus spp. parasitant les caféiers au Guatemala
Résumé : Three populations of #Pratylenchus# spp. were collected from coffee roots in three different ecological zones in Guatemala, reared on carrot discs, and characterised by morpho-biometry, biology and pathogenicity studies. Biometric characters showed that these populations belong to the "#P. coffeae-P. loosi# complex" (males present, two lip annules, stylet : 13.6-16.0 microm, V : 73.6-86.8%, tail conoid with various tip shape); according to SEM observations, two populations belong to the group 1 of Corbett and Clark (1983) whilst the third belongs to group 2. These three populations seems to be obligatory amphimictic : i) no multiplication occurred for single juvenile inoculations on carrot discs (n = 20); ii) multiplication was observed in 33% and 100% of two juvenile (n = 20) and ten-juvenile inoculations (n = 2 to 6 depending on the population) respectively. Furthermore, cross-breeding experiments with these populations were all unsuccessful, indicating the existence of reproductive barriers. The three populations exhibited significant differences in reproductive fitness in carrot discs but they all had a maximal multiplication rate at 27°C. In parallel their pathogenicity on coffee seedlings was also significantly different but not correlated with their respective reproductive fitness on carrot discs.
Mots-clés Agrovoc : Pratylenchus, Coffea arabica, pouvoir pathogène, différence biologique, identification
Mots-clés géographiques Agrovoc : Guatemala
Classification Agris : H10 - Ravageurs des plantes
Auteurs et affiliations
- Villain Luc, CIRAD-CP-CAFE (GTM)
- Baujard P.
- Molina Amauri, ANACAFE (GTM)
- Pignolet Luc, CIRAD-CP-CAFE (FRA)
- Sarah Jean-Louis, CIRAD-AMIS-PROTECTION DES CULTURES (FRA)
Autres liens de la publication
- Document en bibliothèque
- Localisation du document : CD_BR7159 [(Bibliothèque de Lavalette)]
Source : Cirad - Agritrop (https://agritrop.cirad.fr/390417/)
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