UFYMA   27844
UNIDAD DE FITOPATOLOGIA Y MODELIZACION AGRICOLA
Unidad Ejecutora - UE
artículos
Título:
IDENTIFYING INBRED LINES WITH RESISTANCE TO ENDEMIC DISEASES IN EXOTIC MAIZE GERMPLASM
Autor/es:
ROSSI, EZEQUIEL A.; BALZARINI, MÓNICA; BONAMICO NATALIA C.; BONAMICO NATALIA C.; RUIZ, MARCOS; RUIZ, MARCOS; ROSSI, EZEQUIEL A.; BALZARINI, MÓNICA
Revista:
CROP SCIENCE
Editorial:
CROP SCIENCE SOC AMER
Referencias:
Lugar: Baltimore; Año: 2020 vol. 60 p. 3141 - 3150
ISSN:
0011-183X
Resumen:
Mal de Rio Cuarto (MRC) and common rust (CR), caused by Mal de Rio Cuarto virus (MRCV) and Puccinia sorghi, respectively, are endemic diseases affecting maize (Zea mays L.) production in Argentina. Exotic maize germplasm is an important source of resistance to these diseases. The aim of this work was to identify maize lines that exhibit MRC and CR resistance. A multi-environment trial was performed to phenotypically assess a diverse panel of inbred lines from the International Maize and Wheat Improvement Center (CIMMYT). The maize lines were evaluated using a disease severity index (DSI) for MRC and CR in the central area of Argentina. A multi-trait mixed linear model was used to identify the lines with the best performance for both diseases and estimate genetic parameters. No correlation of resistance between MRC and CR was found among the tested lines. Additionally, BLUPs of genotypic effects were used as response variable to perform a genome-wide association study (GWAS). The GWAS revealed promising alleles for maize breeding, two associated with MRC and three with CR. Lines with lower DSI for MRC and CR were identified as novel materials for incorporating resistance to the local germplasm.