Resistência mediada por aleloquímicos de genótipos de tomateiro à mosca-branca e ao ácaro-rajado

• Autor(a) principal: Silva, Vanisse de Fátima
• Data de Publicação: 2009
• Outros Autores: Maluf, Wilson Roberto, Cardoso, Maria das Graças, Gonçalves Neto, Álvaro Carlos, Maciel, Gabriel Mascarenhas, Nízio, Daniela Aparecida Castro, Silva, Vânia Aparecida
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Repositório Institucional da UFLA
• Texto Completo: http://repositorio.ufla.br/jspui/handle/1/37214
• topic: Bemisia argentifolii; Lycopersicon esculentum; Tetranychus urticae; Aleloquímicos; Resistência varietal; Sesquiterpeno; Allelochemicals; Varietal resistance; Sesquiterpene

The objective of this work was to assess the degree of resistance to the whitefly (Bemisia argentifolii) and to the two-spotted spider mite (Tetranychus urticae) of tomato hybrids resulting from crosses between high-zingiberene (ZGB) lines and high-acylsugar (AS) lines, as compared to their parental lines and to commercial vouchers. High-AS lines, high-ZGB lines, double heterozygous (ZGB+AS) hybrids, hybrids heterozygous for ZGB and hybrids heterozygous for AS were tested. The wild accessions PI 127826 and LA-716 were used as high-ZGB and high-AS vouchers, respectively, while the genotypes Debora Max and TOM-684 were used as vouchers for low ZGB and AS. The genotypes were submitted to resistance tests to the whitefly and repellency to the spider mite. Double heterozygous (ZGB+AS) hybrids were more resistant to whiteflies than the commercial vouchers, but less resistant than the high-ZGB or the high-AS lines. Double heterozygous (ZGB+AS) hybrids were more repellent to the spider mite than the commercial vouchers, and their repellency to mites was similar to that of high-ZGB or high-AS lines. There was no synergistic effect between ZGB and AS, for both resistance to the whitefly and repellency to the two-spotted spider mite, in the double heterozygous (ZGB+AS) genotypes.