Abstract
Key message
The qSCN18 QTL from PI 56756C was confirmed and fine-mapped to improve soybean resistance to the SCN population HG Type 2.5.7 using near-isogenic lines carrying recombination crossovers within the QTL region. The QTL underlying resistance was fine-mapped to a 166-Kbp region on chromosome 18, and the candidate genes were selected based on genomic analyses.
Abstract
Soybean cyst nematode (SCN, Heterodera glycines, Ichinohe) is the most devastating pathogen of soybean. Understanding the genetic basis of SCN resistance is crucial for managing this parasite in the field. Two major loci, rhg1 and Rhg4, were previously characterized as valuable resources for SCN resistance. However, their continuous use has caused shifts in the virulence of SCN populations, which can overcome the resistance conferred by these two major loci. Reduced effectiveness became a major concern in the soybean industry due to continuous use of rhg1 for decades. Thus, it is imperative to identify sources of SCN resistance for durable SCN management. A novel QTL qSCN18 was identified in PI567516C. To fine-map qSCN18 and identify resistance genes, a large backcross population was developed. Nineteen near-isogenic lines (NILs) carrying recombination crossovers within the QTL region were identified. The first phase of fine-mapping narrowed the QTL region to 549-Kbp, whereas the second phase confined the region to 166-Kbp containing 23 genes. Two flanking markers, MK-1 and MK-6, were developed and validated to detect the presence of the qSCN18 resistance allele. Haplotype analysis clustered the fine-mapped qSCN18 region from PI 567516C with the cqSCN-007 locus previously mapped in the wild soybean accession PI 468916. The NILs were developed to further characterize the causal gene(s) harbored in this QTL. This study also confirmed the previously identified qSCN18. The results will facilitate marker-assisted selection (MAS) introducing the qSCN18 locus from PI 567516C into high-yielding soybean cultivars with durable resistance to SCN.
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Abbreviations
- ANOVA:
-
Analysis of variance
- FI:
-
Female index
- HSD:
-
Tukey’s honestly significant difference test
- KASP:
-
Kompetitive allele specific PCR
- MAS:
-
Marker-assisted selection
- NIL:
-
Near-isogenic line
- RCBD:
-
Randomized complete block design
- QTL:
-
Quantitative trait loci
- SCN:
-
Soybean cyst nematode
- SNP:
-
Single nucleotide polymorphism
- WGRS:
-
Whole genome re-sequencing
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Acknowledgements
This research was funded by the United States Department of Agriculture—National Institute of Food and Agriculture (USDA-NIFA) grant 2019-67013-29370. The authors would like to thank Dr. J. Grover Shannon for his scientific suggestions and careful proofreading of the manuscript.
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MU carried out the experiments, developed KASP markers and recombinant NILs, performed phenotyping, analyzed data, and wrote the manuscript. HY analyzed data and contributed to the interpretation of the results. TDV developed backcross population, contributed to the design and implementation of the research. GBP performed haplotype and synteny analyses. JW and LZ contributed to phenotyping preparation and sample processing. HTN conceived the original idea and supervised the project. All authors discussed the results and contributed to the final manuscript.
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Usovsky, M., Ye, H., Vuong, T.D. et al. Fine-mapping and characterization of qSCN18, a novel QTL controlling soybean cyst nematode resistance in PI 567516C. Theor Appl Genet 134, 621–631 (2021). https://doi.org/10.1007/s00122-020-03718-6
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DOI: https://doi.org/10.1007/s00122-020-03718-6