Development and validation of KASP markers for the greenbug resistance gene Gb7 and the Hessian fly resistance gene H32 in wheat
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Greenbug and Hessian fly are important pests that decrease wheat production worldwide. We developed and validated breeder-friendly KASP markers for marker-assisted breeding to increase selection efficiency.
Greenbug (Schizaphis graminum Rondani) and Hessian fly [Mayetiola destructor (Say)] are two major destructive insect pests of wheat (Triticum aestivum L.) throughout wheat production regions in the USA and worldwide. Greenbug and Hessian fly infestation can significantly reduce grain yield and quality. Breeding for resistance to these two pests using marker-assisted selection (MAS) is the most economical strategy to minimize losses. In this study, doubled haploid lines from the Synthetic W7984 × Opata M85 wheat reference population were used to construct linkage maps for the greenbug resistance gene Gb7 and the Hessian fly resistance gene H32 with genotyping-by-sequencing (GBS) and 90K array-based single nucleotide polymorphism (SNP) marker data. Flanking markers were closely linked to Gb7 and H32 and were located on chromosome 7DL and 3DL, respectively. Gb7-linked markers (synopGBS773 and synopGBS1141) and H32-linked markers (synopGBS901 and IWB65911) were converted into Kompetitive Allele Specific PCR (KASP) assays for MAS in wheat breeding. In addition, comparative mapping identified syntenic regions in Brachypodium distachyon, rice (Oryza sativa), and sorghum (Sorghum bicolor) for Gb7 and H32 that can be used for fine mapping and map-based cloning of the genes. The KASP markers developed in this study are the first set of SNPs tightly linked to Gb7 and H32 and will be very useful for MAS in wheat breeding programs and future genetic studies of greenbug and Hessian fly resistance.
Nucleotide–nucleotide basic local alignment search tool
Kompetitive allele specific PCR
Logarithm of the odds
Restriction fragment length polymorphism
Single nucleotide polymorphism
The authors thank Charlie Rush for providing access to the ABI 7500 instrument for running KASP assays. We appreciate the seeds provided by Jesse Poland and Eduard Akhunov from Kansas State University, Manhattan, KS, and Mark Sorrells from Cornell University, Ithaca, NY. This research was mainly supported by Texas A&M AgriLife Research and Texas Wheat Producers Board. Partial funding was also provided by the National Research Initiative Competitive Grants 2017-67007-25939 from the USDA National Institute of Food and Agriculture.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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