Fusarium head blight (FHB), mainly caused by Fusarium graminearum, is a destructive disease in wheat. A population consisting of 229 F2 and F2:3 plants derived from the cross PI 672538 The FHB resistance data distribution in the F2 population indicates that some quantitative trait loci (QTLs) were controlling the FHB resistance in PI 672538.We further detected two major QTLs (Qfhs-2B, Qfhs-3B) from analysis of the resistance data and the PCRamplified results using WinQTLCart 2.5 software. Qfhs-2B, flanked by Xbarc55-2B and Xbarc1155-2B, explained more than 11.6% of the phenotypic variation of the percentage of diseased spikelets (PDS), and Qfhs-3B, flanked by Xwmc54-3B and Xgwm566-3B, explained more than 10% of the PDS phenotypic variation in the F2:3 population. In addition, Qfhs-3B was different from Fhb1 in terms of the pedigree, inheritance, resistance response, chromosomal location, and marker diagnosis. We also detected QTLs for other disease resistance indices, including the percentage of damaged kernels and 1,000-grain weight, in similar chromosomal regions. Therefore, the FHB resistance of PI 672538 was mainly controlled by two major QTLs, mapped on 2B (FhbL693a) and 3B (FhbL693b). PI 672538 could be a useful germplasm for improving wheat FHB resistance.
Bibliographical noteFunding Information:
We thank the National Natural Science Foundation of China (31271721 and 31571661), theKey Projects of theEducationMinistry ofChina (2012146), the Specific Foundation of Agronomy (nyhyzx3-15, 201303016), the bureau of Science and Technology of Fuling of Chongqing (FLKJ-2015ABB1048), and theMinistry of Science and Technology, China (2013CB127701) for financial support.We thankG. H. Bai (Kansas State University) for critically reviewing a draft of this manuscript.
© 2017 The American Phytopathological Society.