Reação de genótipos de maracujazeiro azedo à mancha bacteriana, verrugose e nematoide das galhas

• Ano de defesa: 2013
• Autor(a) principal: Nascimento, Roxana Stefane Mendes
• Orientador(a): Lopes, Everaldo Antonio
• Banca de defesa: Vieira, Bruno Sérgio
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Agronomia
• Departamento: Produção Vegetal
• País: BR
• Palavras-chave em Português: Resistência genética; Passiflora edulis; Controle de doenças
• Palavras-chave em Inglês: Genetic resistance; Passiflora edulis; Disease Control
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOSSANIDADE::FITOPATOLOGIA
• Link de acesso: http://locus.ufv.br/handle/123456789/2023

Brazil is the world s largest producer of passion fruit (Passiflora edulis f. flavicarpa Deg.). However, the occurrence of diseases can drastically the yield of this crop in the country, especially bacterial blight Xanthomonas axonopodis pv. passiflorae, scab Cladosporium herbarum and root-knot disease Meloidogyne spp. Regarding the use of disease-resistant genotypes is a desirable strategy of management in the agriculture, the aim of this work was to assess the resistance of twenty genotypes of passion fruit (CRP 01-12 to CRP 20-12) to bacterial blight, scab and root-knot nematode under greenhouse conditions. The genotypes were artificially inoculated with 1 x 10 8 colony-forming units of the bacterium, 1 x 10 6 spores per ml of the fungus and 5,000 eggs of the nematode. The incidence and the severity of the bacterial blight and the scab were evaluated at 10, 20, 28 and 44 days and at 7, 14, 21 and 31 days after inoculation, respectively. In its turn, the plant development (height, biomass and number of leaves) and the nematological variables (number of galls, eggs, second-stage juveniles in the roots and in the soil, and reproduction factor) were evaluated at 70 days after inoculation of the plants with M. incognita. All genotypes are highly susceptible to bacterial blight and moderatively resistant to scab, except CRP 17-12 and CRP 20-12, which are susceptible to the fungus. In its turn, the genotypes CRP 16-12 and CRP 17-12 were resistant to M. incognita race 2 (FR = 1,0 e FR = 0,5, respectively) and can be grown on soils infested with this nematode.