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An Integrated Meta-QTL and Transcriptome Analysis Provides Candidate Genes Associated with Drought Tolerance in Rice
Yinji Jin1, Weize Dou1, Tianhao Wang1
1College of Agriculture, Yanbian University, Yanji 133002, China.
Plants (Basel, Switzerland)
|December 11, 2025
Summary
This study identifies key genes for drought tolerance in rice by meta-analyzing quantitative trait loci (QTLs) and integrating genomic data. The findings pinpoint core candidate genes crucial for enhancing rice resilience to drought stress.
Area of Science:
- Plant Genetics
- Agronomy
- Climate Change Adaptation
Background:
- Climate change exacerbates drought stress, threatening global rice security.
- Identifying genetic factors for drought tolerance is crucial for crop improvement.
Purpose of the Study:
- To identify stable quantitative trait loci (QTL) for drought tolerance in rice.
- To pinpoint key genes underlying drought tolerance mechanisms.
- To provide candidate genes for breeding climate-resilient rice varieties.
Main Methods:
- Meta-analysis of 901 drought-tolerant QTLs from 52 studies (2000-2023) to derive 77 meta-QTLs (MQTLs).
- Validation of 23 MQTLs using seven independent genome-wide association studies (GWAS).
- Integration of RNA-seq data to identify 3851 differentially expressed genes (DEGs) within MQTL regions, followed by Mfuzz clustering, CRE analysis, PPI network analysis, and AlphaFold structural modeling.
Main Results:
- Condensed 901 QTLs into 77 MQTLs, significantly narrowing confidence intervals.
- Identified 3851 drought-responsive DEGs within MQTL regions.
- Filtered DEGs to identify eleven drought-responsive hub proteins, including two uncharacterized ones.
- Prioritized LOC_Os04g35340 and Os07g0141400 as core candidate genes for drought tolerance.
Conclusions:
- The study successfully identified and validated meta-QTLs for rice drought tolerance.
- Key candidate genes, LOC_Os04g35340 and Os07g0141400, were pinpointed for further investigation.
- These findings contribute to developing strategies for enhancing rice drought resilience in a changing climate.
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