A genome‐wide association study for partial resistance to southern corn rust in tropical maize |
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| Authors: | Lucas Rafael de Souza Camacho Marlon Mathias Dacal Coan Carlos Alberto Scapim Ronald Jos Barth Pinto Dauri Jos Tessmann Rodrigo Ivn Contreras‐Soto |
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| Institution: | Lucas Rafael de Souza Camacho,Marlon Mathias Dacal Coan,Carlos Alberto Scapim,Ronald José Barth Pinto,Dauri José Tessmann,Rodrigo Iván Contreras‐Soto |
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| Abstract: | Southern corn rust (SCR) is a fungal disease found on corn in several countries worldwide. In Brazil, the disease can result in productivity losses of 65%, especially in areas with a history of the disease. In this study, the genetic architecture and identification of genomic regions associated with SCR resistance was investigated by performing a genome‐wide association study. Genotyping‐by‐sequencing was performed to carry out the association between single nucleotide polymorphism (SNP) markers and phenotypic data from two environments on a panel of 164 maize inbred lines. Eight SNPs were identified as significant for SCR resistance. These SNPs were colocalized with QTL regions, some of which underlie candidate resistance genes with functions that play an important role in the stress response during pathogen recognition. These candidate genes, involved in plant defense pathways, could be associated with partial resistance to SCR and provide a partial comprehensive insight into the genetic architecture of this trait. After validation of the SNPs, they will be useful for marker–assisted selection and for a better understanding of maize resistance to SCR. |
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| Keywords: | genetic architecture genotyping‐by‐sequencing Southern corn rust tropical maize |
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