Wednesday, November 7, 2007
250-7

Novel Fusarium Head Blight Resistance in Triticum aestivum Revealed by Haplotyping with DNA Markers Associated with Known Resistance QTL.

C. Zila1, J. Recker1, Xiaorong Shen2, L. Kong1, and H. Ohm1. (1) Department of Agronomy, Purdue University, 915 W. State St., West Lafayette, IN 47907, (2) Purdue University-Agronomy Dept., 2286 Cousteau Dr., West Lafayette, IN 47906

Fusarium head blight (FHB) is a devastating disease of wheat (Triticum aestivum L.) that causes reduced grain yield and the fungus, Fusarium graminearum, produces a micotoxin, deoxynivalenol, (DON) that renders infected wheat grain to be unfit for food or feed. Several sources of resistance in wheat and certain related grass species have been identified. However, research to date indicates that several resistance genes need to be combined to result in highly effective resistance. Thus, there is need to identify additional novel sources of resistance. Xing 117, a wheat line obtained from China that has FHB resistance, the seven wheat lines Ning 7840, Frontana, Wangshuibai, Arina, Renan, F201R, and Chokwang, all previously identified as having partial FHB resistance, as well as P9762 and P9774 that are susceptible to FHB and that were crossed to Xing 117 to develop recombinant inbred populations, were haplotyped at marker loci that are associated with FHB resistance of the seven partially resistant wheat lines. Xing 117 was polymorphic at all previously identified marker loci of the seven wheat lines with partial FHB resistance, as well as these marker loci of P9762 and P9774, indicating that the FHB resistance of Xing 117 is novel compared to the resistance of the seven wheat lines in this study that have partial resistance.