ArticleJournal of applied genetics2026
Genetic mapping of fertility restoration (Rf) genes and development-validation of linked SNPs for A
Article in Journal of applied genetics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- SNP-Based KASP Markers Reveal Genetic Diversity and Population Structure Among African Sorghum Breeding Lines and Hybrids.Plants (Basel, Switzerland) · 2026Article
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7 authors.
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Abstract
Sorghum (Sorghum bicolor L. Moench) is one of the most important cereal crops in which cytoplasmic genetic male sterility (CGMS) is widely exploited for hybrid breeding. Commercial sorghum hybrids globally are predominantly based on the A1 cytoplasmic genetic male sterility (CGMS) system because of its operational ease and cytoplasmic stability. To map fertility restoration (Rf) loci, hybrids were developed by crossing the CMS line 296 A with a recombinant inbred line (RIL) population derived from the cross 296B × IS18551, which segregates for fertility restoration genes. The RIL population consisted of advanced-generation lines (F₆:₇), ensuring high homozygosity suitable for genetic mapping. In addition, F₂ and BC₁F₁ populations were developed from selected fertile RIL-derived hybrids to validate fertility restoration loci.The RIL population was genotyped using a genotyping-by-sequencing (GBS) approach and employed for genome-wide genetic mapping of fertility restoration genes. Based on significant associations, a set of 19 single nucleotide polymorphism (SNP) markers associated with fertility restoration was selected and converted into Kompetitive Allele-Specific PCR (KASP) assays. These 19 KASP markers were first validated in the RIL population and subsequently evaluated using a diverse panel of 150 sorghum lines, comprising 72 maintainer (B) lines and 78 restorer (R) lines.Of the 19 validated KASP markers, six markers were associated with the major fertility restoration locus Rf1 on chromosome SBI-08, while the remaining markers were linked to loci located on chromosomes SBI-01, SBI-03, SBI-07, SBI-09, and SBI-10. The results clearly demonstrate the ability of specific SNP markers to discriminate fertility restoration responses between B- and R-lines. The identified polymorphic SNP markers provide robust molecular tools for fast-tracking line conversion and marker-assisted selection in sorghum hybrid breeding programs. Overall, this study enhances the current understanding of fertility restoration genetics in sorghum by identifying key Rf loci, improving hybrid breeding efficiency, and providing new insights into cytoplasm–nuclear interactions governing male fertility restoration.
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