Abstract
Wild plants belonging to the Solanaceae have been studied by Embrapa Vegetables for their resistance to soil-borne diseases such as bacterial wilt (Ralstonia solanacearum), Phytophthora blight (Phytophthora capsici), Fusarium wilt (Fusarium spp.), and nematodes. The resistance reactions of five wild Solanaceae: Solanum asperolanatum, Solanum stramonifolium, Solanum sp., Solanum paniculatum, and S. subinerme to two species of root-knot nematode, Meloidogyne incognita race 1 and M. mayaguensis were evaluated. ‘Rutgers’ (susceptible) and ‘Nemadoro’ (resistant) tomato were used as standard cultivars. The experiment was conducted in a completely randomized design and the treatments arranged in a factorial design 5×2 (five species of wild Solanaceae and two species of root-knot nematode), with six replications. The seedlings of the wild Solanaceae were maintained in pots, under greenhouse conditions and inoculated with 6000 eggs and juveniles of the root-knot nematode species/plant. Sixty days after inoculation the plants were evaluated for the egg mass index (EMI), gall index (GI), number of eggs/g of root (NEGR), and reproduction factor (RF). S. asperolanatum, S. stramonifolium, Solanum sp. were resistant to M. incognita race 1, while S. stramonifolium, Solanum paniculatum, and S. subinerme were resistant to M. mayaguensis.
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