ORIGINAL RESEARCH article
Front. Plant Sci.
Sec. Plant Breeding
Volume 16 - 2025 | doi: 10.3389/fpls.2025.1662582
SNP-based linkage mapping reveals novel quantitative trait loci for yield traits in noug (Guizotia abyssinica (L. f.) Cass.)
Provisionally accepted
- 1Department of Plant Breeding, Swedish University of Agricultural Sciences, P.O. Box 190, 23422, Lomma, Sweden
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Noug (Guizotia abyssinica) is a vital Ethiopian oilseed crop lacking comprehensive genomic resources. This study constructed the first high-density SNP-based linkage map for this diploid species (2n=30, genome size ~1.7 Gb). Using an F₂ mapping population of 286 individuals, we generated 13,888 high-quality SNPs from genotyping-by-sequencing (GBS), which were mapped onto 15 linkage groups (LGs) with a mean marker density of 2.1 cM, covering 90.6% of the genome. Phenotypic evaluation revealed significant variation for nine agronomic traits, including plant height (110–292 cm), days to flowering (49–115 days), and oil content (13.88– 55.62%). Quantitative trait loci (QTL) mapping identified 27 QTL for six traits. Major findings include a flowering time QTL (qDTF-9-1) on LG9 explaining 7.6% of phenotypic variation (PVE) and a seed yield QTL (qNSPP-5-1) on LG5 explaining 2.9% PVE. Comparative genomics with sunflower (Helianthus annuus) revealed significant synteny, enabling the identification of candidate genes underlying these QTL: CLC-b (for qDTF-9-1) and GPT1 (for qNSPP-5-1). Additional QTL were detected for thousand-seed weight (cumulative PVE 51.2%), flower size (47.5%), capitula number (32.8%), and oil content (38.1%). This high-density genetic map and the identified QTL provide a foundational genomic resource for marker-assisted breeding to improve yield and agronomic traits in noug.
Keywords: Guizotia abyssinica, candidate genes, Comparative genomics, marker-assistedselection (MAS), QTL mapping, SNP markers
Received: 09 Jul 2025; Accepted: 25 Aug 2025.
Copyright: © 2025 Gebeyehu, Hammenhag, Vetukuri, Ortiz and Geleta. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Adane Gebeyehu, 1Department of Plant Breeding, Swedish University of Agricultural Sciences, P.O. Box 190, 23422, Lomma, Sweden
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