Hydroxycinnamate Synthesis and Association with Mediterranean Corn Borer Resistance

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• 作者：Rogelio Santiago ; Rosa Ana Malvar ; Jaime Barros-Rios ; Luis Fernando Samayoa ; Ana Butrón
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2016
• 出版时间：January 27, 2016
• 年：2016
• 卷：64
• 期：3
• 页码：539-551
• 全文大小：437K
• ISSN：1520-5118

文摘

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.