Reação de cultivares de soja a Meloidogyne incognita e M. javanica

• Ano de defesa: 2013
• Autor(a) principal: Teixeira, Renato Andrade
• Orientador(a): Rocha, Mara Rúbia da
• Banca de defesa: Melo, Patrícia Guimarães Santos, Teramoto, Adriana, Santiago, Débora Cristina, Meyer, Maurício Conrado, Rocha, Mara Rúbia da
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Goiás
• Programa de Pós-Graduação: Programa de Pós-graduação em Agronomia (EAEA)
• Departamento: Escola de Agronomia e Engenharia de Alimentos - EAEA (RG)
• País: Brasil
• Palavras-chave em Português: Nematoide de galhas; Resistência; Concentração de inóculo
• Palavras-chave em Inglês: Root-knot nematode; Resistance; Inoculum concentration
• Área do conhecimento CNPq: CIENCIAS AGRARIAS::AGRONOMIA
• Link de acesso: http://repositorio.bc.ufg.br/tede/handle/tede/4435

Soybean has great economic importance for Brazil, which is among the major producing countries. The crop is attacked by various pathogens and among them are the nematodes of the genera Meloidogyne that can reduce the yeld. Among the various methods of control the use of resistant cultivars is one of them, but there are several cultivars still without information about its reaction to this genera of nematodes. In this study we evaluated the response of soybean cultivars to Meloidogyne incognita race 3 and Meloidogyne javanica, and the penetration of these nematodes in soybean cultivars exposed to different inoculoum concentrations. The experiments were conducted in a greenhouse installed at the Universidade Federal de Goiás, Goiânia, GO. Seeds were planted into a sterilized substrate and the seedlings were inoculated with M. incognita or M. javanica eggs and J2. In assessing the cultivars response to the nematodes we evaluated the population density (eggs and J2/10 g root) and reproduction factor (RF) at 60 days after inoculation. In another experiment the penetration of nematodes was observed at 10 days after inoculation by counting the number of J2 and J3 within the plant tissue. 45 days after inoculation the population density (eggs and J2/10 g root) was also evaluated. M. incognita had the RF < 1,0 in most of the cultivars tested and M. javanica had RF > 1,0 in all the cultivars. By using Moura & Régis (1987) criteria fifteen cultivars were ranked as resistant or highly resistant and none as registant to M. javanica. In general, the increase of inoculum concentration increased the amount of nematodes in the roots.