Characterization of Quantitative Trait Loci for Fusarium Head Blight Resistance and Agronomic Traits in Wheat Cultivar 'Jagger' and Its Mutant 'JagR1097'.
Yuzhou Xu, Na Liu, Yang Liu, Lanfei Zhao, Lirong Zhang, Guixiao La, Dongtao Liu, Zhenqi Su, Amy Bernardo, Paul St Amand, Xiaomao Lin, Jin Cai, Xuan Xu, Guihua Bai
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引用次数: 0
Abstract
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 F5 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.
期刊介绍：
Phytopathology publishes articles on fundamental research that advances understanding of the nature of plant diseases, the agents that cause them, their spread, the losses they cause, and measures that can be used to control them. Phytopathology considers manuscripts covering all aspects of plant diseases including bacteriology, host-parasite biochemistry and cell biology, biological control, disease control and pest management, description of new pathogen species description of new pathogen species, ecology and population biology, epidemiology, disease etiology, host genetics and resistance, mycology, nematology, plant stress and abiotic disorders, postharvest pathology and mycotoxins, and virology. Papers dealing mainly with taxonomy, such as descriptions of new plant pathogen taxa are acceptable if they include plant disease research results such as pathogenicity, host range, etc. Taxonomic papers that focus on classification, identification, and nomenclature below the subspecies level may also be submitted to Phytopathology.
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