Resistance of cultivated coffee (Coffea arabica and C. canephora) trees to corky-root caused by Meloidogyne arabicida and Fusarium oxysporum, under controlled and field conditions
The coffee disease complex known as corky-root, composed of the root-knot nematode #Meloidogyne arabicida# and #Fusarium oxysporum#, causes serious damage to #Coffea arabica# in Costa Rica. Resistance to #Meloidogyne arabicida# alone and to the field population (#M. arabicida#, #M. exigua#, #F. oxysporum#) was evaluated under controlled and field conditions. The studied material consisted of subspontaneous-derived #C. arabica# accessions, #C. canephora# accessions, introgression lines derived from the interspecific Timor Hybrid (#C. arabica# x #C. canephora#) and F1 hybrids from crosses between subspontaneous-derived accessions and cultivars. Accessions resistant to #M. arabicida# and to the field population were identified at varying frequencies in the different groups of study materials. The results showed that resistance to corky-root is heritable and that genetic resistance to #M. arabicida# is an effective strategy against corky-root disease. By using #C. canephora# rootstocks, it was possible to substantially reduce mortality in the field and reduce by half the number of plants with corky-root symptoms. The results were used to define appropriate strategies for the sustainable management of coffee corky-root disease resistance.
| Main Authors: | , , , |
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| Format: | article biblioteca |
| Language: | eng |
| Subjects: | F30 - Génétique et amélioration des plantes, H20 - Maladies des plantes, Coffea arabica, Coffea canephora, Meloidogyne, Fusarium oxysporum, résistance aux maladies, résistance génétique, héritabilité, contrôle de maladies, lutte génétique, greffage, http://aims.fao.org/aos/agrovoc/c_1721, http://aims.fao.org/aos/agrovoc/c_1723, http://aims.fao.org/aos/agrovoc/c_4729, http://aims.fao.org/aos/agrovoc/c_16244, http://aims.fao.org/aos/agrovoc/c_2328, http://aims.fao.org/aos/agrovoc/c_35130, http://aims.fao.org/aos/agrovoc/c_3570, http://aims.fao.org/aos/agrovoc/c_2327, http://aims.fao.org/aos/agrovoc/c_3216, http://aims.fao.org/aos/agrovoc/c_3344, http://aims.fao.org/aos/agrovoc/c_1920, |
| Online Access: | http://agritrop.cirad.fr/523335/ http://agritrop.cirad.fr/523335/1/523335.pdf |
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