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Deciphering resistance to Zymoseptoria tritici in the Tunisian durum wheat landrace accession ‘Agili39’

Creator: Ferjaoui, S.
Creator: Aouini, L.
Creator: Ben Slimane, R.
Creator: Ammar, K.
Creator: Dreisigacker, S.
Creator: Schouten, H.J.
Creator: Sapkota, S.
Creator: Bahri, B.
Creator: Ben M’Barek, S.
Creator: Visser, R.G.F.
Creator: Kema, G.
Creator: Hamza, S.
Year: 2021
URI: https://hdl.handle.net/10883/21710
Language: English
Publisher: Research Square
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose
Type: Article
Place of Publication: USA
DOI: 10.21203/rs.3.rs-923215/v1
Description: Background: 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 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. The physical positions of the flanking markers linked to Qstb2B_1 and Qstb2B_2 indicate that these two QTL are 5Mb 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.
Description: Preprint, under consideration at BMC Genomics.
Agrovoc: HARD WHEAT
Agrovoc: LANDRACES
Agrovoc: MYCOSPHAERELLA GRAMINICOLA
Agrovoc: QUANTITATIVE TRAIT LOCI
Agrovoc: GENES
ISSN: 2693-5015
Journal: Research Square


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  • Wheat
    Wheat - breeding, phytopathology, physiology, quality, biotech

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