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Genome-Wide Association Study and Genomic Predictions for Hydroxycinnamate Concentrations in Maize Stover.
Noemi Gesteiro1, Rosa A Malvar1, Ana Butrón1
1UA MBG-UVIGO, Misión Biológica de Galicia (CSIC), Pazo de Salcedo, Pontevedra 36143, España.
Journal of Agricultural and Food Chemistry
|January 13, 2025
Summary
Hydroxycinnamates in maize stover impact pest resistance and biofuel production. Genotypic selection offers a promising strategy for optimizing these compounds, balancing plant defense with forage quality and bioethanol efficiency.
Area of Science:
- Plant biochemistry
- Agricultural science
- Genetics
Background:
- Hydroxycinnamates, such as ferulate (FA) and p-coumarate (pCA), are key maize cell wall components influencing pest resistance, digestibility, and biofuel potential.
- Modulating hydroxycinnamate levels presents a challenge, as increased pest resistance may negatively affect nutritional value and bioethanol production efficiency.
Purpose of the Study:
- To identify genomic regions associated with hydroxycinnamate content in maize.
- To develop and evaluate genomic prediction models for selecting maize with modified hydroxycinnamate levels.
- To guide strategies for improving forage quality and biofuel production without compromising plant resistance.
Main Methods:
- Quantitative trait locus (QTL) analysis to identify genomic regions linked to hydroxycinnamate accumulation.
- Development and assessment of genomic best linear unbiased prediction (GBLUP) models.
- Analysis of genotypic correlations between hydroxycinnamate content and animal digestibility traits.
Main Results:
- Moderate heritability was observed for hydroxycinnamates, but direct phenotypic selection is impractical due to laborious quantification.
- Negative genotypic correlations were found between p-coumarate content and animal digestibility, while diferulates showed positive correlations.
- No colocalization was identified between hydroxycinnamate QTLs and digestibility QTLs, indicating complex genetic relationships.
Conclusions:
- Genotypic selection is recommended as the most effective approach for modifying hydroxycinnamate content in maize.
- Further research is needed to understand the genetic interplay between hydroxycinnamates and digestibility traits.
- Optimizing hydroxycinnamate levels requires a nuanced approach, considering trade-offs in plant defense, forage quality, and biofuel production.
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