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RESISTANCE OF SEMI-WILD COFFEA ARABICA L. FROM ETHIOPIA TO A ROOT-KNOT NEMATODE, MELOIDOGYNE KONAENSIS [RESISTENCIA DE COFFEA ARABICA L. SEMI-SALVAJE DE ETIOPIA TO A ROOT-KNOT NEMATODE, MELOIDOGYNE KONAENSIS]

2012; Organization of Nematologists of Tropical America; Volume: 42; Issue: 1 Linguagem: Inglês

2220-5616

Sayaka Aoki, B. S. Sipes, Carlos Astorga, Chifumi Nagai,

Coffee research and impacts

Aoki, S., B. Sipes, C. Astorga, and C. Nagai. 2012. Resistance of semi-wild Coffea arabica L. from Ethiopia to a rootknot nematode, Meloidogyne konaensis. Nematropica 42:131-136. The Kona coffee root-knot nematode (Meloidogyne konaensis) infects coffee, reduces yield and shortens tree life. Ten accessions of semi-wild Ethiopian Coffea arabica imported from CATIE, Costa Rica were compared to the well characterized susceptible C. arabica ‘Yellow Catuai’ and ‘Typica’ and tolerant C. liberica var. dwevrei ‘Fukunga’ for resistance to M. konaensis. Three thousand eggs were inoculated on the coffee seedlings. Eggs and second-stage juveniles were collected 8 months later and Reproductive factor (Rf) values were calculated. The final nematode levels observed in the semi-wild Ethiopian accessions were 13- to 15-fold lower than in the two susceptible controls (P=0.05). All Ethiopian accessions tested, except ET 8, had Rf values Aoki, S., B. Sipes, C. Astorga, and C. Nagai. 2012. Resistencia de Coffea arabica L. semi-salvaje de Etiopia to a root-knot nematode, Meloidogyne konaensis. Nematropica 42:131-136. El nematodo agallador del cafe Kona (Meloidogyne konaensis) infecta al cafeto, reduce la produccion y acorta la vida del arbol. Se comparo la resistencia a M. konaensis de diez accesiones de Coffea arabica semisalvajes de Etiopia, importadas de CATIE, Costa Rica, con el comportamiento de las variedades susceptibles C. arabica ‘Yellow Catuai’ y ‘Tipica’ y de la variedad tolerante C. liberica var. dwevrei ‘Fukunga’. Las plantulas se inocularon con 3,000 huevos. Ocho meses despues de la inoculacion, se colectaron los huevos y juveniles de segundo estadio para calcular los valores de factor reproductivo (Rf). Los niveles de poblacion de nematodos observados en las accesiones semi-salvajes de Etiopia fueron 13 a 15 veces menores que los observadas en los dos controles susceptibles (P=0.05). Todas las accesiones de Etiopia evaluadas, except ET 8, tuvieron valores de Rf <1, indicando que las accesiones son resistentes.