Genome-wide linkage mapping of Fusarium head blight resistance in common wheat (Triticum aestivum L.)

In total, <i>QFhb.haas-2DL, QFhb.haas-3BS</i> and <i>QFhb.haas-3BL</i> for FHB resistance were identified and each explaining 6.2-6.8%, 7.9-9.2% and 7.6-10.4% of the phenotypic variances (PVEs), respectively. Among these, <i>QFhb.haas-3BS</i> was overlapped with <i>Fhb1, QFhb.haas-2DL</i> nearly with a resistance locus identified from CJ9306, whereas the <i>QFhb.haas-3BL</i> maybe novel. The favorable alleles of <i>QFhb.haas-2DL</i> and <i>QFhb.haas-3BL</i> were contributed by PS5/V975, whereas the favorable alleles of <i>QFhb.haas-3BS</i> originated from Sumai 3. Two kompetitive allele-specific PCR (KASP) markers, <i>Kasp_FhbR_2DL</i> (<i>QFhb.haas-2DL</i>) and Kasp_FhbR_3BL (<i>QFhb.haas-3BL</i>), were developed and validated in 108 common wheat accessions. Four candidate genes were selected, primarily involved in plant hormone metabolism, general metabolism, and immune response. This study provides new loci and available KASP markers in accelerating wheat breeding for higher FHB resistance. Furthermore, these results indicated that the utilization of SHW lines in <i>breeding</i> would introduce new sources of resistance against FHB into the common wheat gene pool.