摘要 : Most of the interspecific rootstocks (<i>Lycopersicum esculentum</i> x <i>L. hirsutum</i>) used in grafted Spanish tomato crops are resistant to <i>Meloidogyne</i> nematodes, but the 'Mi' resistance gene does not work well at high... 展开 Most of the interspecific rootstocks (<i>Lycopersicum esculentum</i> x <i>L. hirsutum</i>) used in grafted Spanish tomato crops are resistant to <i>Meloidogyne</i> nematodes, but the 'Mi' resistance gene does not work well at high soil temperatures. <i>Ralstonia solanacearum</i> is a bacterial disease usual in tropical areas, but recently identified with low incidence in several European countries. This disease could be controlled by grafting tomato on <i>Solanum torvum</i>, which is also resistant to <i>Meloidogyne</i>. However, <i>S. torvum</i> and tomato have low grafting affinity, which could be improved using an intermediate rootstock. Some cultivars of eggplant have a relatively good affinity with tomato and complete affinity with <i>S. torvum</i>. In this study we compared two tomato cultivars (one resistant to <i>Verticillium dalihae, Fusarium oxysporum</i> v. <i>lycopersici</i> race 2 and <i>Meloidogyne</i> spp., and one non-resistant) grafted onto 'Beaufort' (<i>Lycopersicum esculentum</i> x <i>L. hirsutum</i>), 'Torvum Vigor' (<i>Solanum torvum</i>) and also with an intermediate grafting of eggplant ('Cristal') between tomato and <i>S. torvum</i>, with non-grafted plants as controls. This arrangement was carried out in two cropping cycles (winter-spring and summer-autumn). In both cycles, plants grafted onto <i>S. torvum</i>, both single or double grafted, yielded less than those grafted onto 'Beaufort' or non-grafted plants. In the spring cycle, no differences were found between single and double-grafted plants using <i>S. torvum</i> rootstocks, but in the autumn cycle double grafted plants had higher yields than the single grafted plants. The severity of nematode infections, in terms of reducing yields, and/or hypothetical infections of <i>Ralstonia</i>, will determine the utility of this technique in tomato production. 收起