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| Precise mapping of QTL for Hessian fly resistance in the hard winter wheat cultivar ‘Overland’ |
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The Hessian fly (HF, Mayetiola destructor) is a destructive insect pest of wheat in the USA and worldwide. Deploying HF-resistant cultivars is the most effective and economical approach to control this insect pest. A population of 186 recombinant inbred lines (RILs) was developed from ‘Overland’ × ‘Overley’ and phenotyped for responses to HF attack using the HF biotype ‘Great Plains’. A high-density genetic linkage map was constructed using 1,576 single nucleotide polymorphism (SNP) markers generated by genotyping-by-sequencing (GBS). |
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Yunfeng Xu, Guixiao La, Nosheen Fatima, Zihui Liu, Lirong Zhang, Lanfei Zhao, Ming-Shun Chen & Guihua Bai Theoretical and Applied Genetics December 2021; vol. 134: 3951–3962
Figure: Hessian fly (Mayetiola destructor) Cecidomyiidae family
Key messageA major QTL for Hessian fly resistance was precisely mapped to a 2.32 Mb region on chromosome 3B of the US hard winter wheat cultivar ‘Overland’. AbstractThe Hessian fly (HF, Mayetiola destructor) is a destructive insect pest of wheat in the USA and worldwide. Deploying HF-resistant cultivars is the most effective and economical approach to control this insect pest. A population of 186 recombinant inbred lines (RILs) was developed from ‘Overland’ × ‘Overley’ and phenotyped for responses to HF attack using the HF biotype ‘Great Plains’. A high-density genetic linkage map was constructed using 1,576 single nucleotide polymorphism (SNP) markers generated by genotyping-by-sequencing (GBS). Two quantitative trait loci (QTLs) with a significant epistatic effect on HF resistance were mapped to chromosomes 3B (QHf.hwwg-3B) and 7A (QHf.hwwg-7A) in Overland, which are located in similar chromosome regions as found for H35 and H36 in the cultivar ‘SD06165’, respectively. QHf.hwwg-3B showed a much larger effect on HF resistance than QHf.hwwg-7A. Five and four GBS-SNPs, respectively, in the QHf.hwwg-3B and QHf.hwwg-7A QTL intervals were converted into Kompetitive allele specific polymerase chain reaction (KASP) markers. QHf.hwwg-3B was precisely mapped to a 2.32 Mb interval (2,479,314–4,799,538 bp) using near-isogenic lines (NILs) and RILs that have recombination within the QTL interval. The US winter wheat accessions carrying contrasting alleles at KASP markers KASP-3B4525164, KASP-7A47772047 and KASP-7A65090410 showed significant difference in HF resistance. The combination of the two KASP markers KASP-3B3797431 and KASP-3B4525164 is near-diagnostic for the detection of QHf.hwwg-3B in a US winter wheat panel and can be potentially used for screening the QTL in breeding programs.
See: https://link.springer.com/article/10.1007/s00122-021-03940-w |
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(171).png "Precise mapping of QTL for Hessian fly resistance in the hard winter wheat cultivar ‘Overland’")
