Fitness components of Monosporascus cannonballus isolates from northeastern Brazilian melon fields
AUTOR(ES)
Correia, Kamila C., Silva, Erlen K. C., Câmara, Marcos P. S., Sales Jr., Rui, Mizubuti, Eduardo S. G., Armengol, Josep, García-Jiménez, José, Michereff, Sami J.
FONTE
Trop. plant pathol.
DATA DE PUBLICAÇÃO
2014-06
RESUMO
Monosporascus root rot and vine decline caused by Monosporascus cannonballus is one of the most important melon yield-limiting diseases in northeastern Brazil. This study investigated the fitness components of 57 isolates of M. cannonballus obtained from Brazilian melon fields by evaluating: i) their mycelial growth rate (MGR), and perithecia and ascospore production (PP and AP) on potato dextrose agar (PDA); ii) their sensitivity to the fungicide fluazinam; and iii) their virulence to melon seedlings. All M. cannonballus isolates showed variability in their MGR, PP and AP values. They were sensitive to the fungicide fluazinam, showing some degree of mycelial growth inhibition (MGI), and were pathogenic to melon seedlings, with a mean disease severity index (DSI) of 62.1%. By univariate analysis, the formation of groups of similarity amongst the isolates of M. cannonballus within each variable was not limited by the area of origin of each isolate, given that in most situations, different isolates of the same area were distributed into distinct groups of similarity. A multivariate cluster analysis allowed the separation of the 57 M. cannonballus isolates in 18 groups of similarity. The fitness variability among M. cannonballus isolates found in this study should be considered when possible sources of resistance are evaluated in melon breeding programs.
Documentos Relacionados
- Controle biológico de Monosporascus cannonballus com Chaetomium
- Comportamento de cultivares de meloeiro e melancia inoculados com Acremonium cucurbitacearum e Monosporascus cannonballus
- REACTION OF MELON GENOTYPES TO THE ROOT´S ROT CAUSED BY Monosporascus
- Monosporascus cannonballus agente causal do colapso em plantas de melão no Rio Grande do Norte, Brasil
- Influência do agrotêxtil sobre a densidade populacional de Monosporascus cannonballus em solo cultivado com melancia (Citrullus lanatus)