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Stable qw12-1 Locus Across Environments: High-Resolution QTL Mapping for Sustainable Southern Soybean Crinkle Leaf
Wenjie Chen1, Chunting Zhang2, Qian Shi3
1Guangxi Crop Genetic Improvement and Biotechnology Laboratory, Cash Crops Research Institute, Guangxi Academy of Agricultural Sciences, Nanning 530007, China.
Plants (Basel, Switzerland)
|April 14, 2026
Summary
Southern soybean crinkle leaf disease (SSCLD) causes significant yield loss. Researchers identified eight quantitative trait loci (QTLs) for SSCLD resistance, prioritizing two candidate genes for future breeding efforts.
Area of Science:
- Plant Pathology
- Genetics
- Molecular Biology
Background:
- Severe southern soybean crinkle leaf disease (SSCLD) significantly reduces soybean yield by up to 40%.
- Understanding the genetic basis of SSCLD is critical for developing resistant soybean varieties and understanding disease mechanisms.
Purpose of the Study:
- To identify quantitative trait loci (QTLs) associated with SSCLD resistance in soybean.
- To pinpoint candidate genes within identified QTLs for further investigation into SSCLD resistance.
Main Methods:
- A population of 236 recombinant inbred lines (RILs) was developed from a cross between Nannong1138-2 and Zhengxiaodou.
- A genetic map was constructed using 3255 specific locus amplified fragment (SLAF) markers to identify QTLs.
- RT-qPCR was employed to analyze the expression of candidate genes in different soybean lines and developmental stages.
Main Results:
- Eight SSCLD-associated QTLs were identified on chromosomes 3, 6, 12, and 17.
- The qw12-1 locus on chromosome 12 was consistently detected, explaining substantial phenotypic variation (10.18-58.20%).
- Two genes, GLYMA_12G233000 and GLYMA_12G239200, within the qw12-1 interval showed significantly higher expression in crinkled leaf lines.
Conclusions:
- The identified QTLs, particularly qw12-1, provide valuable targets for marker-assisted selection in soybean breeding.
- GLYMA_12G233000 and GLYMA_12G239200 are prioritized as strong candidate genes for SSCLD resistance.
- This study lays the groundwork for fine mapping and cloning of SSCLD-related genes, enhancing our understanding of soybean disease resistance.
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Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...