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Durum wheat (Triticum durum Desf.,2n =28,AABB),which is mainly used to make pasta,is the second cultivated wheat variety worldwide.However,the durum wheat production is severely affected by a number of diseases,such as Fusarium head blight (FHB) and stem rust (Klindworth et al.,2017;Zhao et al.,2018).Thinopyrum elongatum (2n =4x=28),a close relative of wheat,provides a useful gene pool for wheat improvement (Liu et al.,2008).Hexaploid trititrigia 8802 that was produced from the hybrids of durum wheat and Th.elongatum had high resistance to FHB,Ug99,stripe rust and powdery mildew (Guo et al.,2015b).In this study,we mainly focus on introducing the disease resistance genes from 8802 into durum wheat.A complete set of T.durumTh.elongatum monosomic addition lines was created for the first time by backcrossing 8802 to durum wheat.Multicolor fluorescence in situ hybridization (mc-FISH) was used to identify the Th.elongatum 1E-7E chromosomes cytologically,and chromosome-specific molecular markers were also developed.When detecting for FHB resistance,we found that the 1E,3E and 7E addition lines showed high resistance to the spread of FHB,which could serve as essential genetic resources for introducing the FHB resistance genes into durum wheat breeding.