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PLANT GENETIC RESOURCES

Reaction of Wild Emmer Wheat Accessions to Fusarium Head Blight

^a Dep. of Plant Sciences, North Dakota State Univ., Fargo ND 58105
^b Dep. of Plant Pathology, North Dakota State Univ., Fargo ND 58105
^c USDA-ARS, Northern Crops Research Lab., Fargo, ND 58105

^* Corresponding author (xiwen.cai{at}ndsu.edu).

Fusarium head blight (FHB), caused mainly by Fusarium graminearum Schwabe, is a serious disease of wheat (Triticum spp.) worldwide. Host resistance has proven the most effective method of controlling FHB in common wheat (T. aestivum L., 2n = 6x = 42, genomes AABBDD). Progress in breeding for FHB resistance in durum wheat (T. turgidum L. ssp. durum, 2n = 4x = 28, genomes AABB), however, has been limited by a lack of resistance sources. Fortunately, durum wheat has a large number of tetraploid relatives, which represent a gene pool for improvement of FHB resistance in durum. The objective of this study was to search for sources of FHB resistance in wild emmer wheat [T. turgidum L. ssp. dicoccoides (Körn. ex Asch. & Graebner) Thell., 2n = 4x = 28, genomes AABB] (TDIC). We evaluated 416 accessions of wild emmer wheat for reaction to FHB using the point inoculation method in a greenhouse environment. Accessions exhibiting a low FHB disease rating in preliminary evaluations were retested in fully replicated experiments. Among the 416 accessions tested, there was wide variation in response to FHB, ranging from highly resistant to highly susceptible. Several accessions showed minimal disease development across two or more seasons and represent potential new sources to enhance resistance of durum wheat to FHB.

Abbreviations: FHB, Fusarium head blight • TDIC, Triticum turgidum L. ssp. dicoccoides.