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Root Pulling Force Across Drought in Maize Reveals Genotype by Environment Interactions and Candidate Genes
Patrick Woods1,2, Kevin R Lehner1, Kirsten Hein1,2
1Department of Agricultural Biology, Colorado State University, Fort Collins, CO, United States.
Frontiers in Plant Science
|May 2, 2022
Summary
Understanding maize root plasticity is crucial for crop breeding. This study identified genetic markers for root pulling force, revealing predictable patterns and linking root traits to nutrient transport genes.
Area of Science:
- Plant Science
- Genetics
- Agronomy
Background:
- High-throughput phenotyping of root systems is essential for crop improvement.
- Root traits and their plasticity are key targets for breeding resilient crops.
Purpose of the Study:
- To characterize root pulling force and its plasticity in a maize diversity panel.
- To identify genetic loci associated with root pulling force and genotype-by-environment interactions.
Main Methods:
- Large-scale field sampling of root pulling force across different irrigation levels and seasons.
- Genome-wide association analysis (GWAS) to identify significant SNPs.
- Mixed model ANOVA for genotype-by-environment (GxE) interaction analysis.
Main Results:
- Consistent patterns of phenotypic plasticity in root pulling force were observed.
- 54 significant SNPs were identified for root pulling force across various conditions.
- 8 SNPs exhibited significant genotype-by-environment interactions, indicating environment-specific effects.
Conclusions:
- Root plasticity is predictable in maize, offering targets for breeding.
- Identified candidate genes involved in nutrient transport, suggesting a link between water and nutrient sensing pathways.
- The study enhances understanding of the genetic architecture of maize root systems and their adaptive potential.
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