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Fusarium head blight (FHB) is a devastating fungal disease in wheat production. Wheat FHB resistance is controlled by multiple genes and has complicated resistance mechanisms. Type I (resistance to invasion) and type II (resistance to expansion) are two main resistance types of wheat against FHB. Combining both types of FHB resistance in breeding is vitally important for the resistance durability and stability of cultivars. In fine mapping and cloning of type I resistance QTL Fhb4 and Fhb5 and type II resistance QTL Fhb1 in wheat landrace Wangshuibai, functional/tightly-linked molecular markers for them had been obtained. In this study, a new wheat line named Bainong 4299 was bred after introduction of these QTL from NMAS022 with the help of these markers and using modern wheat variety Bainong 4199 as the recipient parent. Compared with Bainong 4199, Bainong 4299 increased type I resistance by at least 73% to 74% and type II resistance by 83% to 88% increase (in terms of the number of diseased spikelets per spike) in two field trials. Moreover, its yield potential had moderate elevation. In conclusion, this study provided another successful illustration of marker-assisted selection and pyramiding of FHB QTL in improving wheat FHB resistance. Bainong 4299 had the potential to become a new FHB resistance cultivar.
ZHANG et al. (Thu,) studied this question.