Deciphering resistance to Zymoseptoria tritici in the Tunisian durum wheat landrace accession ‘Agili39’
Septoria tritici blotch (STB), caused by Zymoseptoria tritici (Z. tritici), is an important biotic threat to durum wheat in the entire Mediterranean Basin. Although most durum wheat cultivars are susceptible to Z. tritici, research in STB resistance in durum wheat has been limited. Results: In our s...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | Inglés |
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Springer
2022
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| Online Access: | https://hdl.handle.net/10568/126555 |
| _version_ | 1855531004975906816 |
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| author | Ferjaoui, Sahbi Aouini, Lamia Ben Slimane, Rim Ammar, Karim Dreisigacker, Susanne Schouten, Henk J. Sapkota, Suraj Bahri, Bochra Ben M’Barek, Sarrah Visser, Richard G.F. Kema, Gert Hamza, Sonia |
| author_browse | Ammar, Karim Aouini, Lamia Bahri, Bochra Ben M’Barek, Sarrah Ben Slimane, Rim Dreisigacker, Susanne Ferjaoui, Sahbi Hamza, Sonia Kema, Gert Sapkota, Suraj Schouten, Henk J. Visser, Richard G.F. |
| author_facet | Ferjaoui, Sahbi Aouini, Lamia Ben Slimane, Rim Ammar, Karim Dreisigacker, Susanne Schouten, Henk J. Sapkota, Suraj Bahri, Bochra Ben M’Barek, Sarrah Visser, Richard G.F. Kema, Gert Hamza, Sonia |
| author_sort | Ferjaoui, Sahbi |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Septoria tritici blotch (STB), caused by Zymoseptoria tritici (Z. tritici), is an important biotic threat to durum wheat in the entire Mediterranean Basin. Although most durum wheat cultivars are susceptible to Z. tritici, research in STB resistance in durum wheat has been limited. Results: In our study, we have identified resistance to a wide array of Z. tritici isolates in the Tunisian durum wheat landrace accession ‘Agili39’. Subsequently, a recombinant inbred population was developed and tested under greenhouse conditions at the seedling stage with eight Z. tritici isolates and for five years under field conditions with three Z. tritici isolates. Mapping of quantitative trait loci (QTL) resulted in the identification of two major QTL on chromosome 2B designated as Qstb2B_1 and Qstb2B_2. The Qstb2B_1 QTL was mapped at the seedling and the adult plant stage (highest LOD 33.9, explained variance 61.6%), conferring an effective resistance against five Z. tritici isolates. The Qstb2B_2 conferred adult plant resistance (highest LOD 32.9, explained variance 42%) and has been effective at the field trials against two Z. tritici isolates. The physical positions of the flanking markers linked to Qstb2B_1 and Qstb2B_2 indicate that these two QTL are 5 Mb apart. In addition, we identified two minor QTL on chromosomes 1A (Qstb1A) and chromosome 7A (Qstb7A) (highest LODs 4.6 and 4.0, and explained variances of 16% and 9%, respectively) that were specific to three and one Z. tritici isolates, respectively. All identified QTL were derived from the landrace accession Agili39 that represents a valuable source for STB resistance in durum wheat. Conclusion: This study demonstrates that Z. tritici resistance in the ‘Agili39’ landrace accession is controlled by two minor and two major QTL acting in an additive mode. We also provide evidence that the broad efficacy of the resistance to STB in ‘Agili 39’ is due to a natural pyramiding of these QTL. A sustainable use of this Z. tritici resistance source and a positive selection of the linked markers to the identified QTL will greatly support effective breeding for Z. tritici resistance in durum wheat. |
| format | Journal Article |
| id | CGSpace126555 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2022 |
| publishDateRange | 2022 |
| publishDateSort | 2022 |
| publisher | Springer |
| publisherStr | Springer |
| record_format | dspace |
| spelling | CGSpace1265552025-11-06T13:07:04Z Deciphering resistance to Zymoseptoria tritici in the Tunisian durum wheat landrace accession ‘Agili39’ Ferjaoui, Sahbi Aouini, Lamia Ben Slimane, Rim Ammar, Karim Dreisigacker, Susanne Schouten, Henk J. Sapkota, Suraj Bahri, Bochra Ben M’Barek, Sarrah Visser, Richard G.F. Kema, Gert Hamza, Sonia wheat research Septoria tritici blotch (STB), caused by Zymoseptoria tritici (Z. tritici), is an important biotic threat to durum wheat in the entire Mediterranean Basin. Although most durum wheat cultivars are susceptible to Z. tritici, research in STB resistance in durum wheat has been limited. Results: In our study, we have identified resistance to a wide array of Z. tritici isolates in the Tunisian durum wheat landrace accession ‘Agili39’. Subsequently, a recombinant inbred population was developed and tested under greenhouse conditions at the seedling stage with eight Z. tritici isolates and for five years under field conditions with three Z. tritici isolates. Mapping of quantitative trait loci (QTL) resulted in the identification of two major QTL on chromosome 2B designated as Qstb2B_1 and Qstb2B_2. The Qstb2B_1 QTL was mapped at the seedling and the adult plant stage (highest LOD 33.9, explained variance 61.6%), conferring an effective resistance against five Z. tritici isolates. The Qstb2B_2 conferred adult plant resistance (highest LOD 32.9, explained variance 42%) and has been effective at the field trials against two Z. tritici isolates. The physical positions of the flanking markers linked to Qstb2B_1 and Qstb2B_2 indicate that these two QTL are 5 Mb apart. In addition, we identified two minor QTL on chromosomes 1A (Qstb1A) and chromosome 7A (Qstb7A) (highest LODs 4.6 and 4.0, and explained variances of 16% and 9%, respectively) that were specific to three and one Z. tritici isolates, respectively. All identified QTL were derived from the landrace accession Agili39 that represents a valuable source for STB resistance in durum wheat. Conclusion: This study demonstrates that Z. tritici resistance in the ‘Agili39’ landrace accession is controlled by two minor and two major QTL acting in an additive mode. We also provide evidence that the broad efficacy of the resistance to STB in ‘Agili 39’ is due to a natural pyramiding of these QTL. A sustainable use of this Z. tritici resistance source and a positive selection of the linked markers to the identified QTL will greatly support effective breeding for Z. tritici resistance in durum wheat. 2022-12 2023-01-04T12:57:27Z 2023-01-04T12:57:27Z Journal Article https://hdl.handle.net/10568/126555 en Open Access application/pdf Springer Ferjaoui, S., Aouini, L., Slimane, R. B., Ammar, K., Dreisigacker, S., Schouten, H. J., Sapkota, S., Bahri, B. A., Ben M’Barek, S., Visser, R. G. F., Kema, G. H. J., & Hamza, S. (2022). Deciphering resistance to Zymoseptoria tritici in the Tunisian durum wheat landrace accession ‘Agili39.’ BMC Genomics, 23(1). https://doi.org/10.1186/s12864-022-08560-2 |
| spellingShingle | wheat research Ferjaoui, Sahbi Aouini, Lamia Ben Slimane, Rim Ammar, Karim Dreisigacker, Susanne Schouten, Henk J. Sapkota, Suraj Bahri, Bochra Ben M’Barek, Sarrah Visser, Richard G.F. Kema, Gert Hamza, Sonia Deciphering resistance to Zymoseptoria tritici in the Tunisian durum wheat landrace accession ‘Agili39’ |
| title | Deciphering resistance to Zymoseptoria tritici in the Tunisian durum wheat landrace accession ‘Agili39’ |
| title_full | Deciphering resistance to Zymoseptoria tritici in the Tunisian durum wheat landrace accession ‘Agili39’ |
| title_fullStr | Deciphering resistance to Zymoseptoria tritici in the Tunisian durum wheat landrace accession ‘Agili39’ |
| title_full_unstemmed | Deciphering resistance to Zymoseptoria tritici in the Tunisian durum wheat landrace accession ‘Agili39’ |
| title_short | Deciphering resistance to Zymoseptoria tritici in the Tunisian durum wheat landrace accession ‘Agili39’ |
| title_sort | deciphering resistance to zymoseptoria tritici in the tunisian durum wheat landrace accession agili39 |
| topic | wheat research |
| url | https://hdl.handle.net/10568/126555 |
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