Supplanting resistance of the Mi gene by root-knot nematode in industrial tomato in the Cerrado in Goiás State of Brazil
AUTOR(ES)
Silva, Rodrigo Vieira da
FONTE
Cienc. Rural
DATA DE PUBLICAÇÃO
02/09/2019
RESUMO
RESUMO: Problemas causados pelos nematoides-das-galhas, pertencentes ao gênero Meloidogyne podem ser controlados com a introdução de genes de resistência em cultivares comerciais de tomateiro. No entanto, plantas do híbrido ‘Heinz 9992’ adequadas ao processamento industrial, portadoras do gene Mi, foram encontradas com suas raízes severamente infectadas, em um cultivo experimental no município de Morrinhos (GO) com sintomas típicos de galhas causadas por Meloidogyne spp. Após dissecar as galhas presentes nas amostras de raízes, as fêmeas do nematoide foram retiradas para a análise do padrão perineal e a caracterização bioquímica por eletroforese de isoenzimas, além do teste de patogenicidade. O patógeno em estudo foi identificado como Meloidogyne incognita. O teste de patogenicidade confirmou que ocorreu a suplantação de resistência do híbrido de tomateiro, portador do gene Mi, por esta população virulenta de M. incognita.ABSTRACT: Problems with root-knot nematodes, caused by genus Meloidogyne, can be controlled through the introduction of resistance genes in commercial varieties of tomatoes. However, plants of the hybrid ‘Heinz 9992’ for industrial processing, carrying the Mi gene, were reported with their roots severely infected in experimental cultivation in Goiás State of Brazil with symptoms typical of galls caused by Meloidogyne spp. After dissecting the galls present in the root samples, the females of the nematodes were removed and afterwards, performed the analysis of the perineal pattern and the biochemical characterization by electrophoresis of isoenzymes, besides the pathogenicity test. The pathogen analyzed was identified as Meloidogyne incognita. The pathogenicity test confirmed the supplanting resistance of the tomato hybrid with the Mi gene by this virulent population of M. incognita.
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