Premium
Identifying inbred lines with resistance to endemic diseases in exotic maize germplasm
Author(s) -
Rossi Ezequiel A.,
Ruiz Marcos,
Bonamico Natalia C.,
Balzarini Mónica G.
Publication year - 2020
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.1002/csc2.20275
Subject(s) - germplasm , biology , inbred strain , breeding program , zea mays , best linear unbiased prediction , rust (programming language) , genetic variability , microbiology and biotechnology , genotype , genome wide association study , agronomy , resistance (ecology) , plant disease resistance , veterinary medicine , cultivar , genetics , selection (genetic algorithm) , single nucleotide polymorphism , gene , medicine , artificial intelligence , computer science , programming language
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 multienvironment 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 multitrait mixed linear model (MLM) 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, best linear unbiased predictions (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.