Abstract
Key message
We identified and integrated the novel FHB-resistant Fhb7The2 allele into wheat B genome and made it usable in both common and durum wheat breeding programs without yellow flour linkage drag.
Abstract
A novel tall wheatgrass-derived (Thinopyrum elongatum, genome EE) Fhb7 allele, designated Fhb7The2, was identified and integrated into the wheat B genome through a small 7B–7E translocation (7BS·7BL–7EL) involving the terminal regions of the long arms. Fhb7The2 conditions significant Type II resistance to Fusarium head blight (FHB) in wheat. Integration of Fhb7The2 into the wheat B genome makes this wild species-derived FHB resistance gene usable for breeding in both common and durum wheat. By contrast, other Fhb7 introgression lines involving wheat chromosome 7D can be utilized only in common wheat breeding programs, not in durum wheat. Additionally, we found that Fhb7The2 does not have the linkage drag of the yellow flour pigment gene that is tightly linked to the decaploid Th. ponticum-derived Fhb7 allele Fhb7Thp. This will further improve the utility of Fhb7The2 in wheat breeding. DNA sequence analysis identified 12 single nucleotide polymorphisms (SNPs) in Fhb7The2, Fhb7Thp, and another Th. elongatum-derived Fhb7 allele Fhb7The1, which led to seven amino acid conversions in Fhb7The2, Fhb7Thp, and Fhb7The1, respectively. However, no significant variation was observed in their predicted protein configuration as a glutathione transferase. Diagnostic DNA markers were developed specifically for Fhb7The2. The 7EL segment containing Fhb7The2 in the translocation chromosome 7BS·7BL–7EL exhibited a monogenic inheritance pattern in the wheat genetic background. This will enhance the efficacy of marker-assisted selection for Fhb7The2 introgression, pyramiding, and deployment in wheat germplasm and varieties.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We thank Mary Osenga for her assistance in high-throughput SNP genotyping.
Funding
This project has been supported by Agriculture and Food Research Initiative Competitive Grant no. 2013-67013-21121 and 2019-67013-35750 from the USDA National Institute of Food and Agriculture, and the US Wheat & Barley Scab Initiative Grant no. 59-0206-7-002.
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WZ contributed to marker development and analysis, cloning, recombinant production and analysis, and data preparation and analysis. TD performed FISH/GISH analysis, SNP marker development, and involved in manuscript preparation. MZ contributed to recombinant production and analysis and SNP assays. SR performed FHB disease evaluation. XZ participated in crossing and chromosome-specific marker analysis for recombinant production. QZ was involved in DNA marker development. SZ was involved in FHB disease evaluation. L.D. performed flour color analysis and contributed to manuscript preparation. JF contributed SNP assays. SX contributed to experiment planning, interpretation, and manuscript preparation. KF contributed to experimental results interpretation and critical revision of the manuscript. SW contributed to FHB disease evaluation and manuscript preparation. JB: contributed to the DNA marker development and critical revision of the manuscript. XC designed and coordinated this work, and was involved in crosses, data analysis and interpretation, and led the manuscript preparation.
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Communicated by Lingrang Kong.
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Supplementary file1. Figure 1. FISH patterns of DS 7E(7B), WGC002 (7BS·7BL-7E), and WGC001 (7BS·7BL-7EL-7BL). Th. elongatum chromatin, (GAA)n repeat, and pSc119.2 repeat are painted green, white, and red, respectively. Chromosomes are counterstained orange. (TIF 18890 KB)
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Supplementary file2 Figure 2. Coding DNA sequence alignments of Fhb7Thp, Fhb7The1 (Wang et al. 2020) and Fhb7The2 (DOCX 25 KB)
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Supplementary file3 Figure 3. The predicted protein models of Fhb7Thp , Fhb7The1 and Fhb7The2 based on the crystal structure of glutathione transferase GSTFuA3 using the SWISS-MODEL. (DOCX 335 KB)
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Supplementary file4 Table 1. Wheat 90K SNP genotyping data of CS chromosome 7B, 7E of DS 7E(7B), WGC002, and WGC001. (XLSX 34 KB)
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Zhang, W., Danilova, T., Zhang, M. et al. Cytogenetic and genomic characterization of a novel tall wheatgrass-derived Fhb7 allele integrated into wheat B genome. Theor Appl Genet 135, 4409–4419 (2022). https://doi.org/10.1007/s00122-022-04228-3
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DOI: https://doi.org/10.1007/s00122-022-04228-3