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Genome-wide association analysis for maize stem Cell Wall-bound Hydroxycinnamates.

A López-Malvar^1,2, A Butrón³, L F Samayoa⁴

¹Facultad de Biología, Departamento de Biología Vegetal y Ciencias del Suelo, Universidad de Vigo, As Lagoas Marcosende, 36310, Vigo, Spain. alopezmalvar@uvigo.es.

BMC Plant Biology

|November 29, 2019

Summary

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Maize hydroxycinnamate content impacts plant defense and industrial uses. This study identified novel genomic regions associated with hydroxycinnamate levels, aiding future breeding strategies for improved maize varieties.

Area of Science:

Plant Biology
Genetics
Biochemistry

Background:

Hydroxycinnamates reinforce maize cell walls, aiding defense but hindering industrial applications like biofuel production.
Understanding genetic control of hydroxycinnamate content is crucial for breeding improved maize varieties.

Purpose of the Study:

To identify genetic variations (SNPs) associated with stem hydroxycinnamate content in maize.
To discover novel genomic regions influencing hydroxycinnamate accumulation for marker-assisted breeding.

Main Methods:

Genome-wide association study (GWAS) on 282 maize inbred lines.
Direct biochemical determination of hydroxycinnamate concentrations (p-coumarate, ferulate, diferulates).
Identification of single nucleotide polymorphisms (SNPs) linked to hydroxycinnamate levels.

Keywords:

Association mapping Cell-wall fortification Diversity panel Hydroxycinnamic acid Zea mays

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Main Results:

Identified significant SNPs associated with p-coumarate, ferulate, and diferulate concentrations in maize pith.
Discovered novel genomic regions (e.g., bins 1.06, 4.01, 5.04, 8.05) linked to hydroxycinnamate content.
Individual SNP effects were minor, explaining 7-10% of phenotypic variation.

Conclusions:

New genomic regions associated with hydroxycinnamate accumulation were identified in maize stems.
Candidate genes involved in cell wall modulation and stress response were proposed.
Genomic selection is recommended over marker-assisted selection for breeding due to low individual SNP effects.