Morphological and biological characterization of three Pratylenchus sp. populations parasitising coffee trees in Guatemala
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.
| Main Authors: | , , , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | H10 - Ravageurs des plantes, Pratylenchus, Coffea arabica, pouvoir pathogène, différence biologique, identification, http://aims.fao.org/aos/agrovoc/c_6155, http://aims.fao.org/aos/agrovoc/c_1721, http://aims.fao.org/aos/agrovoc/c_5629, http://aims.fao.org/aos/agrovoc/c_33264, http://aims.fao.org/aos/agrovoc/c_3791, http://aims.fao.org/aos/agrovoc/c_3418, |
| Online Access: | http://agritrop.cirad.fr/390417/ |
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