title: Hydroxycinnamate Synthesis and Association with Mediterranean Corn Borer Resistance.
abstract: Previous results suggest a relationship between maize hydroxycinnamate concentration in the pith tissues and resistance to stem tunneling by Mediterranean corn borer (MCB, Sesamia nonagrioides Lef.) larvae. This study performs a more precise experiment, mapping an F2 derived from the cross between two inbreds with contrasting levels for hydroxycinnamates EP125 × PB130. We aimed to co-localize genomic regions involved in hydroxycinnamate synthesis and resistance to MCB and to highlight the particular route for each hydroxycinnamate component in relation to the better known phenylpropanoid pathway. Seven quantitative trait loci (QTLs) for p-coumarate, two QTLs for ferulate, and seven QTLs for total diferulates explained 81.7, 26.9, and 57.8% of the genotypic variance, respectively. In relation to borer resistance, alleles for increased hydroxycinnamate content (affecting one or more hydroxycinnamate compounds) could be associated with favorable effects on stem resistance to MCB, particularly the putative role of p-coumarate in borer resistance.
authors.affiliation: Agrobiologı́a Ambiental, Calidad de Suelos y Plantas (UVIGO), Unidad Asociada a la Misión Biológica de Galicia (CSIC); Departamento Biologı́a Vegetal y Ciencias del Suelo, Facultad de Biologı́a, Universidad de Vigo , Campus As Lagoas Marcosende, 36310 Vigo, Spain.
authors.forename: Rogelio
authors.initials: R
authors.lastname: Santiago
authors.affiliation: Misión Biológica de Galicia (CSIC) , Apartado 28, 36080 Pontevedra, Spain.
authors.forename: Rosa Ana
authors.initials: RA
authors.lastname: Malvar
authors.affiliation: Department of Biological Sciences, University of North Texas , 1155 Union Circle #305220, Denton, Texas 76203, United States.
authors.forename: Jaime
authors.initials: J
authors.lastname: Barros-Rios
authors.affiliation: Misión Biológica de Galicia (CSIC) , Apartado 28, 36080 Pontevedra, Spain.
authors.forename: Luis Fernando
authors.initials: LF
authors.lastname: Samayoa
authors.affiliation: Misión Biológica de Galicia (CSIC) , Apartado 28, 36080 Pontevedra, Spain.
authors.forename: Ana
authors.initials: A
authors.lastname: Butrón
mesh_terms: D000818:Animals; D003373:Coumaric Acids / Q000378:metabolism*; D060467:Disease Resistance; D007178:Inbreeding; D007814:Larva / Q000502:physiology; D009036:Moths / Q000502:physiology*; D010935:Plant Diseases / Q000276:immunology / Q000469:parasitology*; D040641:Quantitative Trait Loci; D003313:Zea mays / Q000235:genetics / Q000276:immunology* / Q000378:metabolism / Q000469:parasitology
chemical_list: D003373:Coumaric Acids
keywords: Sesamia nonagrioides; Zea mays; candidate gene; hydroxycinnamic acid; resistance