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QTL Mapping Low-Temperature Germination Ability in the Maize IBM Syn10 DH Population
Qinghui Han1, Qingxiang Zhu1, Yao Shen1
1The Key Laboratory for Quality Improvement of Agricultural Products of Zhejiang Province, College of Advanced Agricultural Science, Zhejiang Agriculture and Forestry University, Hangzhou 311300, China.
Plants (Basel, Switzerland)
|January 20, 2022
Summary
Chilling injury severely impacts maize seed germination in China. This study identified quantitative trait loci (QTLs) and candidate genes for low-temperature germination tolerance, aiding in breeding climate-resilient maize varieties.
Area of Science:
- Plant Genetics
- Crop Science
- Molecular Biology
Background:
- Chilling injury during germination is a major constraint on maize production in China.
- Identifying genes for low-temperature tolerance is crucial for developing improved maize varieties.
Purpose of the Study:
- To perform quantitative trait loci (QTL) analysis for low-temperature germination ability in maize.
- To identify candidate genes associated with enhanced germination under cold stress.
Main Methods:
- Utilized a doubled haploid (DH) population derived from B73 × Mo17 for QTL mapping.
- Conducted RNA sequencing (RNA-Seq) on germinating seeds under low-temperature conditions.
- Analyzed gene variations in candidate genes like GLABRA2 and transcription factors.
Main Results:
- Detected 13 QTLs for low-temperature germination traits across maize chromosomes.
- Identified five QTL clusters suggesting co-regulation of multiple germination traits.
- Discovered differentially expressed genes and variations in key candidate genes (GLABRA2, bHLH, bZIP) between parental lines.
Conclusions:
- This research provides a genetic basis for marker-assisted breeding of cold-tolerant maize.
- The findings lay the groundwork for understanding the molecular mechanisms of maize seed germination under low temperatures.
