AI Article Synopsis
- The study focuses on the investigation and mapping of resistance to Asian soybean rust (ASR) in the soybean line PI 594756, comparing it to the susceptible line PI 594891.
- Using Bulked Segregant Analysis (BSA) and a panel of isolates, researchers identified resistance traits, classifying PI 594756 as having monogenic dominant resistance, although it showed incomplete dominance when quantified.
- Genetic mapping placed the resistance gene on chromosome 18, pinpointing it between specific base pair positions, and a haplotype analysis revealed unique SNPs that can aid in marker-assisted selection (MAS) for future breeding.
Article Abstract
Unlabelled: Asian soybean rust (ASR), caused by the fungus , is the main disease affecting soybean in Brazil. This study aimed at investigating and mapping the resistance of the PI 594756 to , by using Bulked Segregant Analysis (BSA). The PI 594756 and the susceptible PI 594891 were crossed and the resulting and populations (208 and 1770 plants, respectively) were tested against ASR. Also, these PIs and differential varieties were tested against a panel of monosporic isolates. Plants presenting tan lesions were classified as susceptible () while plants presenting reddish-brown (RB) lesions were classified as resistant. DNA bulks were genotyped with Infinium BeadChips and the genomic region identified was further analyzed in the individuals with target GBS (tGBS). PI 594,56 presented a unique resistance profile compared to the differential varieties. The resistance was monogenic dominant; however, it was classified as incompletely dominant when quantitatively studied. Genetic and QTL mapping placed the PI 594756 gene between the genomic region located at 55,863,741 and 56,123,516 bp of chromosome 18. This position is slightly upstream mapping positions of (PI 200492) and (PI 594538A). Finally, we performed a haplotype analysis in a whole genomic sequencing-SNP database composed of Brazilian historical germplasm and sources of genes. We found SNPs that successfully differentiated the new PI 594756 allele from and sources. The haplotype identified can be used as a tool for marker-assisted selection (MAS).
Supplementary Information: The online version contains supplementary material available at 10.1007/s11032-023-01358-4.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10248603 | PMC |
| http://dx.doi.org/10.1007/s11032-023-01358-4 | DOI Listing |
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