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- W2761049145 abstract "Summary The Qfhs.ifa‐5A allele, contributing to enhanced Fusarium head blight resistance in wheat, resides in a low‐recombinogenic region of chromosome 5A close to the centromere. A near‐isogenic RIL population segregating for the Qfhs.ifa‐5A resistance allele was developed and among 3650 lines as few as four recombined within the pericentromeric C‐5 AS 1‐0.40 bin, yielding only a single recombination point. Genetic mapping of the pericentromeric region using a recombination‐dependent approach was thus not successful. To facilitate fine‐mapping the physically large Qfhs.ifa‐5A interval, two gamma‐irradiated deletion panels were generated: (i) seeds of line NIL 3 carrying the Qfhs.ifa‐5A resistance allele in an otherwise susceptible background were irradiated and plants thereof were selfed to obtain deletions in homozygous state and (ii) a radiation hybrid panel was produced using irradiated pollen of the wheat line Chinese Spring ( CS ) for pollinating the CS ‐nullisomic5Atetrasomic5B. In total, 5157 radiation selfing and 276 radiation hybrid plants were screened for deletions on 5 AS and plants containing deletions were analysed using 102 5 AS ‐specific markers. Combining genotypic information of both panels yielded an 817‐fold map improvement ( cR / cM ) for the centromeric bin and was 389‐fold increased across the Qfhs.ifa‐5A interval compared to the genetic map, with an average map resolution of 0.77 Mb/ cR . We successfully proved that the RH mapping technique can effectively resolve marker order in low‐recombining regions, including pericentromeric intervals, and simultaneously allow developing an in vivo panel of sister lines differing for induced deletions across the Qfhs.ifa‐5A interval that can be used for phenotyping." @default.
- W2761049145 created "2017-10-20" @default.
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- W2761049145 date "2017-11-10" @default.
- W2761049145 modified "2023-10-01" @default.
- W2761049145 title "High-resolution mapping of the pericentromeric region on wheat chromosome arm 5AS harbouring the Fusarium head blight resistance QTL<i>Qfhs.ifa-5A</i>" @default.
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- W2761049145 doi "https://doi.org/10.1111/pbi.12850" @default.
- W2761049145 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5902775" @default.
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