Abstract
Fusarium head blight (FHB) is a major disease that reduces grain yield and quality of winter and spring wheat in eastern South Dakota. This study was conducted to determine the association of FHB resistance QTLs (Fhb1 and Qfhs.ifa-5A) to spring and winter growth habits of bread wheat. Four genotypes consisting of susceptible winter wheats ‘Nekota’ and ‘2137’ and moderately resistant spring wheats ‘ND2710’ and ‘BacUp’ were crossed and populations derived from the crosses were separated into spring and winter types following cold treatment of seedlings at -70C for 1 h. A total of six SSR markers (Fhb1 markers: Xgwm389, Xgwm493 and STS256; Qfhs.ifa-5A markers: Xgwm293, Xgwm304 and Barc186) were used to genotype the populations. A chi-square analysis deviating from a 1:1 ratio showed that there were significant differences in the percentage of genotypes containing homozygous marker alleles for Fhb1 and Qfhs.ifa-5A between spring and winter types in the population ND2710/2137, ND2710/Nekota and BacUp/2137. The percentage of genotypes with homozygous marker alleles for Fhb1 was lower in the spring types in the populations ND2710/2137 and ND2710/BacUp. In contrast, the spring types in the population ND2710/Nekota had a higher percentage of genotypes containing homozygous marker alleles for Qfhs.ifa-5A compared with the winter types. The results indicated that Fhb1 was not necessarily associated with the spring growth habit; whereas, Qfhs.ifa-5A was not necessarily associated with the winter growth habit.
Highlights
Fusarium head blight (FHB) is a major disease of wheat (Triticum aestivum) that reduces yield and end-use quality and produces mycotoxins in the grain (Stack and McMullen 1985; Parry et al 1995)
Polymorphic bands were detected for the STS3B-256 marker between each of 2137 and Nekota with ND2710 but not with BacUp (Figs. 1 and 2)
SSR markers Xgwm389 and Xgwm493 showed that lines homozygous for susceptible Fhb1 were significantly lower in the winter types in the Nekota/ND2710 population
Summary
Fusarium head blight (FHB) is a major disease of wheat (Triticum aestivum) that reduces yield and end-use quality and produces mycotoxins in the grain (Stack and McMullen 1985; Parry et al 1995). Chemical and biological practices are only partially successful for FHB management, an emphasis has been placed on host-plant resistance. Different sources of FHB resistance have been identified from China, Japan, Eastern Europe, Italy and Brazil. Resistance from Sumai and its derivatives is stable and numerous QTLs linked to the FHB resistance have been identified in these sources. A gene, Fhb (formerly Qfhs.ndsu-3BS), for FHB resistance was mapped, in Sumai3-derived populations, at 3BS region that explained up to 60% phenotypic variation and reduced disease by about 27% (Liu et al 2006; Anderson et al 2007)
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