2025/07/07 by Yuzhou Xu, Na Liu, Yang Liu +11 · 1 voice
Agricultural and Biological Sciences · Biochemistry, Genetics and Molecular Biology · #Agronomy #Allele #Biology #Cultivar #Fusarium #Gene #Genetics #Inbred strain #Mycotoxins in Agriculture and Food #Plant Pathogens and Fungal Diseases #Quantitative trait locus #Wheat and Barley Genetics and Pathology
paper · doi:10.1094/phyto-03-25-0100-r
published in Phytopathology 115(9), 1186-1193 (American Phytopathological Society)
openalex publication_date 2025/07/07 · openalex created_date 2025/07/08 · openalex updated_date 2026/08/01
Fusarium head blight (FHB) is a devastating disease in wheat ( Triticum aestivum) worldwide. To discover novel quantitative trait loci (QTLs) for FHB resistance and study their relationships with agronomic traits, a linkage map of single-nucleotide polymorphism markers was constructed using F 5 recombinant inbred lines developed from ‘JagR1097’ × ‘Jagger’. Jagger is a popular hard winter wheat cultivar in the U.S. Central Great Plains, and JagR1097 is an ethyl methanesulfonate-induced Jagger mutant with significantly higher FHB resistance than Jagger. The two parents also differ in plant height (HT), heading date (HD), spike length (SL), spike compactness, and spikelet number per spike (SNS). QTL analysis identified two FHB resistance QTLs on the 4AL and 6AL chromosomes. QFhb-4AL showed a major effect on FHB resistance and explained up to 15.79% of the phenotypic variation. This QTL overlaps with a major QTL for plant HT, HD, SL, and SNS. A fragment inversion between Jagger and ‘Chinese Spring’ was identified to overlap with QFhb-4AL, suggesting that using Chinese Spring as a reference may not always provide accurate orientation for gene mapping in different cultivars. QTL clusters on chromosomes 2BS, 3DL, 4BS, 5AS, 5DL, and 7AL were also identified for different agronomic traits. Jagger contributed FHB resistance and high SNS alleles at QFhb-4AL, as well as high SNS alleles at QSns-5DL, whereas JagR1097 contributed high SNS alleles at QSns-2BS and QSns-7AL. Combining beneficial alleles of QTLs may simultaneously improve FHB resistance and agronomic traits in new cultivars.