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GENETIC STOCK

Registration of DGE-1, Durum Wheat Alien Disomic Addition Line with Resistance to Fusarium Head Blight

USDA–ARS, Cereals Crops Research Unit, Northern Crop Science Lab., Fargo, ND 58105

^* Corresponding author (prem.jauhar{at}ndsu.edu).

ABSTRACT

The durum wheat (Triticum turgidum L.) alien disomic addition line, DGE-1 (Reg No. GS-156, PI 645483), was developed by the USDA-ARS, Cereal Crops Research Unit, Northern Crop Science Laboratory, Fargo, ND and released in 2006. DGE-1 (2n = 28 + 2) possesses an additional pair of chromosomes from diploid wheatgrass, Lophopyrum elongatum (Host) Á. Löve (2n = 2x = 14; EE genome) conferring resistance to Fusarium head blight (FHB), caused by the fungus Fusarium graminearum Schwabe. The pedigree of DGE-1 is [(Langdon/L. elongatum//Langdon)*1/Langdon]*8. The (Langdon x L. elongatum) F₁ hybrid (2n = 2x = 21; ABE genomes) was backcrossed with the recurrent Langdon parent, then selfed for one generation, and backcrossed again before selfing for several cycles. The addition line with FHB resistance (less than 21% on the visual scale; mean = 6.5% in the generation before release) was obtained by selecting for resistance in each generation after the durum wheat chromosome complement was reconstituted with the added alien chromosome in one and later in double dose. The extra chromosome involved is 1E of L. elongatum.

Abbreviations: EST, Expressed Sequence Tag • FHB, Fusarium head blight • PCR, Polymorphic Chain Reaction • SSR, Simple Sequence Repeat • TRAP, Targeted Region Amplified Polymorphism