Breeding strategy for resistance to Striga asiatica (L.) Kuntze based on genetic diversity and population structure of tropical maize (Zea mays L.) lines
Maize (Zea mays L.) is a major staple crop in southern Africa and is produced on millions of hectares. However, its yield is greatly reduced by Striga spp. a witchweed which is causing US$ 7 billion losses annually. Use of host resistance could be an effective way of controlling Striga spp. and resi...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Springer
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/141971 |
| _version_ | 1855538813128933376 |
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| author | Gasura, Edmore Nyandoro, Brian Mabasa, Stanford Setimela, Peter S. Kyalo, Martina Yao, Nasser |
| author_browse | Gasura, Edmore Kyalo, Martina Mabasa, Stanford Nyandoro, Brian Setimela, Peter S. Yao, Nasser |
| author_facet | Gasura, Edmore Nyandoro, Brian Mabasa, Stanford Setimela, Peter S. Kyalo, Martina Yao, Nasser |
| author_sort | Gasura, Edmore |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Maize (Zea mays L.) is a major staple crop in southern Africa and is produced on millions of hectares. However, its yield is greatly reduced by Striga spp. a witchweed which is causing US$ 7 billion losses annually. Use of host resistance could be an effective way of controlling Striga spp. and resistance to Striga spp. is quantitative, mainly controlled by additive gene action. Understanding the population structure and genetic diversity is therefore key in designing an effective breeding program targeting grain yield heterosis and resistance to Striga spp. The aim of this study was to determine the genetic diversity and population structure of the key germplasm from tropical Africa. This information could guide in the identification of heterotic groups and potential testers required to kick start a maize breeding program for Striga asiatica (L.) Kuntze in southern Africa. A total of 222 maize inbred lines from IITA and CIMMYT were used in this study. The materials were genotyped using the genotyping-by-sequencing method. A total of 45, 000 SNP markers were revealed, and these were subjected to analysis of molecular variance, structure analysis and clustering using the Gower’s distance and neighbor joining algorithm. Molecular variance was lager within individuals (91%) than among populations (9%). The inbred lines clustered into three major groups, with the IITA germplasm clustering separately from CIMMYT germplasm. A breeding strategy for S. asiatica resistance was proposed with the aim of increasing genetic gains in both the resistance and grain yield. |
| format | Journal Article |
| id | CGSpace141971 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | Springer |
| publisherStr | Springer |
| record_format | dspace |
| spelling | CGSpace1419712025-12-08T10:11:39Z Breeding strategy for resistance to Striga asiatica (L.) Kuntze based on genetic diversity and population structure of tropical maize (Zea mays L.) lines Gasura, Edmore Nyandoro, Brian Mabasa, Stanford Setimela, Peter S. Kyalo, Martina Yao, Nasser genetic diversity population structure striga asiatica plant breeding Maize (Zea mays L.) is a major staple crop in southern Africa and is produced on millions of hectares. However, its yield is greatly reduced by Striga spp. a witchweed which is causing US$ 7 billion losses annually. Use of host resistance could be an effective way of controlling Striga spp. and resistance to Striga spp. is quantitative, mainly controlled by additive gene action. Understanding the population structure and genetic diversity is therefore key in designing an effective breeding program targeting grain yield heterosis and resistance to Striga spp. The aim of this study was to determine the genetic diversity and population structure of the key germplasm from tropical Africa. This information could guide in the identification of heterotic groups and potential testers required to kick start a maize breeding program for Striga asiatica (L.) Kuntze in southern Africa. A total of 222 maize inbred lines from IITA and CIMMYT were used in this study. The materials were genotyped using the genotyping-by-sequencing method. A total of 45, 000 SNP markers were revealed, and these were subjected to analysis of molecular variance, structure analysis and clustering using the Gower’s distance and neighbor joining algorithm. Molecular variance was lager within individuals (91%) than among populations (9%). The inbred lines clustered into three major groups, with the IITA germplasm clustering separately from CIMMYT germplasm. A breeding strategy for S. asiatica resistance was proposed with the aim of increasing genetic gains in both the resistance and grain yield. 2022-03 2024-05-21T14:36:05Z 2024-05-21T14:36:05Z Journal Article https://hdl.handle.net/10568/141971 en Limited Access Springer Gasura, E., Nyandoro, B., Mabasa, S., Setimela, P. S., Kyalo, M., & Yao, N. (2022). Breeding strategy for resistance to Striga asiatica (L.) Kuntze based on genetic diversity and population structure of tropical maize (Zea mays L.) lines. Genetic Resources and Crop Evolution, 69(3), 987–996. https://doi.org/10.1007/s10722-021-01274-6 |
| spellingShingle | genetic diversity population structure striga asiatica plant breeding Gasura, Edmore Nyandoro, Brian Mabasa, Stanford Setimela, Peter S. Kyalo, Martina Yao, Nasser Breeding strategy for resistance to Striga asiatica (L.) Kuntze based on genetic diversity and population structure of tropical maize (Zea mays L.) lines |
| title | Breeding strategy for resistance to Striga asiatica (L.) Kuntze based on genetic diversity and population structure of tropical maize (Zea mays L.) lines |
| title_full | Breeding strategy for resistance to Striga asiatica (L.) Kuntze based on genetic diversity and population structure of tropical maize (Zea mays L.) lines |
| title_fullStr | Breeding strategy for resistance to Striga asiatica (L.) Kuntze based on genetic diversity and population structure of tropical maize (Zea mays L.) lines |
| title_full_unstemmed | Breeding strategy for resistance to Striga asiatica (L.) Kuntze based on genetic diversity and population structure of tropical maize (Zea mays L.) lines |
| title_short | Breeding strategy for resistance to Striga asiatica (L.) Kuntze based on genetic diversity and population structure of tropical maize (Zea mays L.) lines |
| title_sort | breeding strategy for resistance to striga asiatica l kuntze based on genetic diversity and population structure of tropical maize zea mays l lines |
| topic | genetic diversity population structure striga asiatica plant breeding |
| url | https://hdl.handle.net/10568/141971 |
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