Unveiling stagnant flooding tolerance in lowland NERICAs: genomic insights and breeding prospects
Rice cultivation in the rainfed lowland ecosystem during the rainy season is prone to encounter substantial flooding challenges in the form of complete submergence or prolonged stagnant flooding. While the Sub1 gene enables rice plants to survive the momentary complete submergence, stagnant flooding...
| Main Authors: | , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Springer Nature
2026
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/180033 |
| _version_ | 1855533081055723520 |
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| author | Semwal, Vimal Kumar Afeez, Shittu Bhadmus, Olatunde A. Jolayemi, Okanlawon Ramaiah, Venuprasad |
| author_browse | Afeez, Shittu Bhadmus, Olatunde A. Jolayemi, Okanlawon Ramaiah, Venuprasad Semwal, Vimal Kumar |
| author_facet | Semwal, Vimal Kumar Afeez, Shittu Bhadmus, Olatunde A. Jolayemi, Okanlawon Ramaiah, Venuprasad |
| author_sort | Semwal, Vimal Kumar |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Rice cultivation in the rainfed lowland ecosystem during the rainy season is prone to encounter substantial flooding challenges in the form of complete submergence or prolonged stagnant flooding. While the Sub1 gene enables rice plants to survive the momentary complete submergence, stagnant flooding, defined by incomplete submergence for extended periods, necessitates moderate stem elongation for survival. In this study, we characterized 60 lowland NERICA varieties under stagnant flooding (SF) conditions, identify tolerant germplasm and detect genomic regions associated with key traits to aid breeding efforts. Phenotypic evaluations revealed significant genetic variability among the NERICA varieties, with some accessions showing 20–60% yield reduction under SF stress. The derived NERICA L-19/IR64 Sub1 RIL population showed improved grain yield under SF compared to both parents and submergence-tolerant checks. A total 27 QTLs were identified associated with plant height, tiller number, panicle number, days to flowering and grain yield. Stable and major-effect QTLs, such as qPH1.1, qPH3.1 and qDTF3.1, were consistent across environments, explaining up to 48% of the phenotypic variation. Several QTLs co-localized, indicating potential pleiotropy or tight linkage. Positional candidate genes associated with these regions include regulators of gibberellin signaling, flowering time and other developmental processes. This study highlights the potential of lowland NERICAs as a genetic resource and provides QTL, donor lines, molecular resources that form a practical basis for marker-assisted selection and pre-breeding of dual-tolerant rice cultivars adapted to climate-induced flooding scenarios in sub-Saharan Africa. |
| format | Journal Article |
| id | CGSpace180033 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2026 |
| publishDateRange | 2026 |
| publishDateSort | 2026 |
| publisher | Springer Nature |
| publisherStr | Springer Nature |
| record_format | dspace |
| spelling | CGSpace1800332026-01-18T02:04:07Z Unveiling stagnant flooding tolerance in lowland NERICAs: genomic insights and breeding prospects Semwal, Vimal Kumar Afeez, Shittu Bhadmus, Olatunde A. Jolayemi, Okanlawon Ramaiah, Venuprasad rainfed farming lowland water tolerance varieties rice quantitative trait loci marker-assisted selection grain yield plant height Sub-Saharan Africa Rice cultivation in the rainfed lowland ecosystem during the rainy season is prone to encounter substantial flooding challenges in the form of complete submergence or prolonged stagnant flooding. While the Sub1 gene enables rice plants to survive the momentary complete submergence, stagnant flooding, defined by incomplete submergence for extended periods, necessitates moderate stem elongation for survival. In this study, we characterized 60 lowland NERICA varieties under stagnant flooding (SF) conditions, identify tolerant germplasm and detect genomic regions associated with key traits to aid breeding efforts. Phenotypic evaluations revealed significant genetic variability among the NERICA varieties, with some accessions showing 20–60% yield reduction under SF stress. The derived NERICA L-19/IR64 Sub1 RIL population showed improved grain yield under SF compared to both parents and submergence-tolerant checks. A total 27 QTLs were identified associated with plant height, tiller number, panicle number, days to flowering and grain yield. Stable and major-effect QTLs, such as qPH1.1, qPH3.1 and qDTF3.1, were consistent across environments, explaining up to 48% of the phenotypic variation. Several QTLs co-localized, indicating potential pleiotropy or tight linkage. Positional candidate genes associated with these regions include regulators of gibberellin signaling, flowering time and other developmental processes. This study highlights the potential of lowland NERICAs as a genetic resource and provides QTL, donor lines, molecular resources that form a practical basis for marker-assisted selection and pre-breeding of dual-tolerant rice cultivars adapted to climate-induced flooding scenarios in sub-Saharan Africa. 2026-01-06 2026-01-18T02:04:06Z 2026-01-18T02:04:06Z Journal Article https://hdl.handle.net/10568/180033 en Limited Access Springer Nature Semwal, Vimal Kumar, Shittu Afeez, Olatunde A. Bhadmus, Okanlawon Jolayemi, and Ramaiah Venuprasad. "Unveiling stagnant flooding tolerance in lowland NERICAs: genomic insights and breeding prospects." Theoretical and Applied Genetics 139, no. 27 (2026). |
| spellingShingle | rainfed farming lowland water tolerance varieties rice quantitative trait loci marker-assisted selection grain yield plant height Sub-Saharan Africa Semwal, Vimal Kumar Afeez, Shittu Bhadmus, Olatunde A. Jolayemi, Okanlawon Ramaiah, Venuprasad Unveiling stagnant flooding tolerance in lowland NERICAs: genomic insights and breeding prospects |
| title | Unveiling stagnant flooding tolerance in lowland NERICAs: genomic insights and breeding prospects |
| title_full | Unveiling stagnant flooding tolerance in lowland NERICAs: genomic insights and breeding prospects |
| title_fullStr | Unveiling stagnant flooding tolerance in lowland NERICAs: genomic insights and breeding prospects |
| title_full_unstemmed | Unveiling stagnant flooding tolerance in lowland NERICAs: genomic insights and breeding prospects |
| title_short | Unveiling stagnant flooding tolerance in lowland NERICAs: genomic insights and breeding prospects |
| title_sort | unveiling stagnant flooding tolerance in lowland nericas genomic insights and breeding prospects |
| topic | rainfed farming lowland water tolerance varieties rice quantitative trait loci marker-assisted selection grain yield plant height Sub-Saharan Africa |
| url | https://hdl.handle.net/10568/180033 |
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