High Resistant Genes of Leaf Rust and Fusarium Transferred to Wheat from Thinopyrum intermedium and Th. elongatum

Wheat can be easily crossed with wild relatives that provide broader source of genes for its development. In recent years, many valuable genes for enhancing the quality and resistance of wheat have been explored from its wild relatives such as Thinopyrum elongatum and Th. intermedium. We found that several addition lines between wheat-Th. elongatum and wheat-Th. intermedium present a potentially novel source of resistance to wheat major diseases Fusarium Head Blight (FHB) and leaf rust. Based on our previous work, ditelosomic lines 7ES derived from wheat-Th. elongatum and TAI-14 derived from wheat-Th. intermedium might carry the novel resistance genes on the alien chromosomes. In order to further fine mapping, a series of small-fragment translocation lines from 7ES and TAI-14 were obtained by pollen radiation. Partial translocation lines from 7ES and TAI-14 showed high resistance even nearly immune to the FHB and leaf rust. Furthermore, we transferred these useful fragments to major wheat cultivars Jimai22 and Aikang58 which are easily infected to the FHB and leaf rust by successive backcross. These novel disease-resistance sources will be greatly helpful for the wheat breeding and improvement in further.