| Fusarium head blight(FHB) is a fungal disease of wheat mainly caused by Fusarium graminearum, which seriously reduce the yield and quality of wheat. In order to explore resistant germplasm resources and resistant genes to FHB, 454 wheat cultivars(lines) from the regions of Jiangsu, Hubei, Anhui, Sichuan, and Henan, were selected as materials. Resistance to FHB was identified by single-flower drop injection method.Molecular markers related to Fhb1, Fhb2, Fhb4, Fhb5, and QFhs.crc-2DL were used for molecular screen, and the yield-related agronomic traits were investigated among the cultivars(lines), such as plant height, spike length, thousand-grain weight, etc. The results showed that among the 454 wheat varieties(lines), seven varieties performed high resistance to FHB; 115 varieties were moderately resistant to FHB, and 177 cultivars were moderately susceptible to FHB. The results of molecular screen showed that five materials contain four disease resistance genes, among which four materials reached to the level of high resistance; 10 materials contain three disease resistance genes, among which seven reached to the level of medium resistance. Twelve materials contain only Fhb1 with an average diseased spikelet rate of 25.48%; 100 materials contain only QFhs.crc-2DL with an average diseased spikelet rate of 32.24%. It was found that wheat FHB resistance is often linked with poor agronomic traits such as excessive plant height and spike sparseness. A total of 26 wheat varieties(lines) were screened with excellent agronomic traits and resistance to downy mildew, such as Shengxuan 4, Xiangmai 35, Ningmai 19, etc., which can be used as wheat FHB genetic breeding germplasm resources. |
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