Resistance sources to Meloidogyne enterolobii of wild Solanum species and interspecific hybrids

Resumo

The objective of this work was to prospect sources of resistance to the root-knot nematode Meloidogyne enterolobii in wild Solanum species and hybrids to be used as potential rootstocks for cultivated Solanaceae. Accessions of seven Solanum species, as well two interspecific hybrids, were characterized for the resistance to M. enterolobii. The experiments were conducted in a greenhouse in Brasília-DF, Brazil, in a completely randomized block design with four replications of one plant per pot inoculated with M. enterolobii, evaluated for nematological characters. S. torvum, S. paludosum, and S. paniculatum presented a high resistance to M. enterolobii. S. crinitum also had a good level of resistance, with six among seven accessions being resistant; whereas for S. macrocarpon two accessions from five, and one S. sisymbriifolium from three evaluated, were also resistant. Almost all of the interspecific hybrids among S. stramonifolium var. inerme and S. stramonifolium, except one, and five interspecific hybrids of S. stramonifolium and S. aethiopicum gr. gilo, among eleven, are also resistant. These results are very significant, since cultivated Solanaceae species of economic importance resistant to M. enterolobii are difficult to obtain by conventional breeding, the identification of resistance in compatible Solanum species can enable their use as rootstocks.