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Characterization of Grain Structure Using Micro-CT and Identification of Related Candidate Genes by QTL Mapping in
Meixia Tan1, Yang Yang1, Jiarong Zhang1
1College of Agriculture, Shanxi Agricultural University, Jinzhong 030810, China.
Plants (Basel, Switzerland)
|December 11, 2025
Summary
Foxtail millet
Area of Science:
- Plant genetics and crop science.
- Agricultural biotechnology.
- Agronomy and sustainable agriculture.
Background:
- Foxtail millet is a drought-resistant, nutrient-rich crop vital for rain-fed agriculture.
- Grain structure influences germination and plant density, impacting yield, but lacks detailed research.
- Understanding these traits is crucial for improving foxtail millet cultivation.
Purpose of the Study:
- To investigate foxtail millet grain's internal structure traits using advanced imaging.
- To identify quantitative trait loci (QTLs) associated with these grain structure traits.
- To discover candidate genes regulating grain structure for yield improvement.
Main Methods:
- Utilized Micro-CT technology to analyze 15 internal grain structure traits.
- Employed recombination inbred lines (RILs) for quantitative trait loci (QTL) mapping.
- Integrated phenotypic data, genome sequences, and transcriptome profiling.
Main Results:
- Identified four quantitative trait loci (QTLs) associated with foxtail millet grain structure.
- Characterized variations in embryo, endosperm, cavity, and hull structure.
- Discovered seven candidate genes potentially regulating grain development and structure.
Conclusions:
- This study provides the first genetic insights into foxtail millet grain structure.
- Identified QTLs and candidate genes offer targets for breeding improved foxtail millet varieties.
- Findings contribute to enhancing crop yield in water-limited environments.
