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Bragantia

versão impressa ISSN 0006-8705versão On-line ISSN 1678-4499

Resumo

GOMES, Jorge Augusto Assis et al. Resistance of sweet potato clones to meloidogyne incognita races 1 and 3. Bragantia [online]. 2015, vol.74, n.3, pp.291-297.  Epub 28-Jul-2015. ISSN 1678-4499.  https://doi.org/10.1590/1678-4499.0454.

The objective of this study was to evaluate sweet potato clones for resistance to root-knot nematode, Meloidogyne incognita races 1 and 3. For each nematode physiological race, a greenhouse experiment was set up in a randomized block experimental design with three replications and six plants per plot. Fifty-eight sweet potato clones from the UFVJM germplasm bank were evaluated, plus five commercial cultivars (Brazlândia Rosada, Brazlândia Branca, Palmas, Princesa and Coquinho), plus the cv. Santa Clara tomato (susceptible to Meloidogyne spp.). Stems were planted in 72-cell expanded polystyrene trays, filled with commercial substrate and inoculated with the pathogen thirty days after planting. Forty-five days after inoculation, the eggs were extracted, counted, and later evaluated. Resistance level classification was performed based on reproduction factor (RF) and reproduction index (RI). Among the 63 analyzed clones, a percentage of 78% were classified as resistant to M. incognita race 1.79% to race 3 and 67% showed multiple resistance to both M. incognita races.

Palavras-chave : Ipomoea batatas; root-knot nematode; breeding; pathogen; reproduction factor; reproduction index.

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