Reação de acessos de feijão-fava cultivado na Paraíba a Meloidogyne javanica.

Abstract

The lima beans are widely consumed in the northeastern Brazil, exerting a strong socioeconomic influence on the local communities. However, the low productivity caused by biotic and abiotic factors precludes the increase of production. Among the biological agents, the root-knot nematodes hamper the vegetative and productive development of the crops. To select plants with resistance to parasitism, in this study, we assessed the reaction of 15 cultigens of lima beans ( "Lavandeira preta", "orelha de vó", "Rajada 01", "Rajada 02", "Coquinho", "Fava branca", "Lavandeira vermelha", "Raio de Sol", "Boca de moça", "Paulistinha", "Rajadinha", "Fava cinza", "Mulatinho", "Lavandeira" and "Fava cearense") to M. javanica and grouped them into" classes according to resistance levels. The experiment was carried out in a greenhouse under a completely randomized design with 15 cultigens of lima beans inoculated with M. javanica with five replicates for each treatment. Bean seeds were sown in pots and, after the 10th day of the emerged plants, the thinning was performed, remaining only one plant, which was the experimental unit. We inoculated the plants with 10mL of inoculum suspension (4,000 eggs/J2 of M. javanica). After 60 days from inoculation, we quantified the parasitic actions in the root systems and the main agronomic characteristics of the crop. All cultigens of lima beans were parasitized, however, the population density of nematodes was reduced at different levels. The cultigens "Lavandeira preta", "Orelha de vó", and "Fava cearense" were very resistant, while the "Lavandeira vermelha" was slightly resistant, and the others were susceptible to the parasitism of M. javanica.