Periódicos
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/3352
Navegar
2 resultados
Resultados da Pesquisa
Item Reaction of coffee genotypes to different populations of Meloidogyne spp.: detection of a naturally virulent M. exigua population(Sociedade Brasileira de Fitopatologia, 2009) Muniz, Maria de Fátima S.; Campos, Vicente P.; Moita, Antônio W.; Gonçalves, Wallace; Almeida, Maria Ritta A.; Sousa, Fábio Rodrigues de; Carneiro, Regina Maria D. G.The reaction of seven genotypes of Coffea arabica to 10 Meloidogyne spp. populations collected mainly from coffee plantations in Brazil and Costa Rica was evaluated under greenhouse conditions. The inoculum consisted of 10,000 eggs per plant. Evaluations were done 8 months after inoculations considering the root fresh weight, gall and egg mass indices, number of eggs per gram of root and reproduction factor (RF). The cultivars Obatã IAC 1669-20, Sarchimor IAC 4361 and Tupi Amarelo IAC 5111 exhibited susceptibility to the four Brazilian M. exigua populations tested. However, cv. Tupi Vermelho IAC 1669-33 revealed resistance (RF value of 0.7) to the M. exigua population from Lavras, Minas Gerais State, Brazil. A population of M. exigua from Bom Jesus de Itabapoana, Rio de Janeiro State, Brazil, was highly virulent on cv. IAPAR 59 (RF= 165.7), bearing resistance gene Mex-1, and was also virulent on genotype Paraíso (H 419-5-4-5-2) (RF=396.2). A Meloidogyne sp. population on coffee from Garça, São Paulo State, Brazil, reproduced at low rates (RF ranging from 0.1 to 3.9) on all genotypes. All tested cultivars were susceptible to M. incognita and M. paranaensis. M. mayaguensis of guava from Paraná State, Brazil, reproduced at low rates in all coffee genotypes; however, another population of coffee, from Costa Rica, was more aggressive and showed RF value that ranged from 0.8 to 12.4. Results of this study point for the first time to the ability of a naturally occurring M. exigua population to overcome the resistance conferred by the Mex-1 gene.Item Pathogenicity of Meloidogyne spp. (Tylenchida: Meloidogynidae) from Brazil and Central America on two genotypes of Coffea arabica(Sociedade Brasileira de Fitopatologia, 2008) Carneiro, Regina M.D.G.; Mesquita, Luiz F.G. de; Gonçalves, Wallace; Pereira, Antônio A.Entre as espécies de nematóides de galhas mais danosas ao cafeeiro, Meloidogyne exigua, Meloidogyne paranaensis, Meloidogyne incognita, Meloidogyne arabicida, Meloidogyne izalcoensis e Meloidogyne mayaguensis são as que causam os maiores problemas em áreas de cultivo de café no Brasil e países da América Latina. A reação de resistência a essas seis epécies foi estudada na progênie H419-5-4-5-2, obtida do cruzamento artificial entre cultivar Catuaí Amarelo IAC 30 com a seleção de Híbrido de Timor UFV 445-46.