Page Banner

United States Department of Agriculture

Agricultural Research Service

Title: Marker-Assisted Characterization of Asian Wheat Lines for Resistance to Fusarium Head Blight

Authors
item Yu, Jian-Bin - KANSAS STATE UNIV.
item Bai, Guihua
item Cai, Shi-Bin - JAAS CHINA
item Ban, Tomohiro - CYMMYT MEXICO

Submitted to: Theoretical and Applied Genetics
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: April 19, 2006
Publication Date: May 18, 2006
Citation: Yu, J., Bai, G., Cai, S., Ban, T. 2006. Marker-assisted characterization of asian wheat lines for resistance to fusarium head blight. Theoretical and Applied Genetics. 113:308-320.

Interpretive Summary: Wheat Fusarium head blight. (FHB) is an important disease in the U.S.A. The FHB resistance gene from chromosome 3BS of Sumai 3 has been used as a major source of resistance to Fusarium head blight (FHB) worldwide, but resistance genes from other sources are necessary to avoid complete dependence on a single source of resistance. Fifty-nine Asian wheat landraces and cultivars differing in the levels of FHB resistance were evaluated for resistance to disease symptom spread within a spike and for genetic diversity by the aid of molecular markers. Genetic relationships among these wheat accessions estimated based on the molecular marker data were consistent with their known geographic distribution and pedigrees. Chinese resistant landraces had broader genetic diversity than that of accessions from southwestern Japan. Molecular marker data suggested that only a few lines derived from Sumai 3 may carry all the putative resistance genes from Sumai 3. About half of accessions might have one or two FHB resistance genes from Sumai 3. Some highly resistant accessions may carry different FHB resistance genes or alleles from those in Sumai 3. Molecular data also suggested that FHB resistance genes on chromosomes 3BS, 5AS, and 6BS of Sumai 3 were derived from the Chinese landrace Taiwan Xiaomai.

Technical Abstract: The major quantitative trait locus (QTL) on 3BS from Sumai 3 and its derivatives has been used as a major source of resistance to Fusarium head blight (FHB) worldwide, but resistance genes from other sources are necessary to avoid complete dependence on a single source of resistance. Fifty-nine Asian wheat landraces and cultivars differing in the levels of FHB resistance were evaluated for Type II FHB resistance and for genetic diversity on the basis of amplified fragment length polymorphism (AFLP) and simple sequence repeats (SSRs). Genetic relationships among these wheat accessions estimated by cluster and principal coordinate analysis (PCA) of molecular marker data were consistent with their geographic distribution and pedigrees. Chinese resistant landraces had broader genetic diversity than that of accessions from southwestern Japan. The haplotype pattern of the SSR markers that linked to FHB resistance quantitative trait loci (QTLs) on chromosomes 3BS, 5AS and 6BS of Sumai 3 suggested that only a few lines derived from Sumai 3 may carry all the putative QTLs from Sumai 3. About half of accessions might have one or two FHB resistance QTLs from Sumai 3. Some accessions with a high level of resistance, may carry different FHB resistance loci or alleles from those in Sumai 3, and are worth further investigation. SSR data also clearly suggested that FHB resistance QTLs on 3BS, 5AS, and 6BS of Sumai 3 were derived from Chinese landrace Taiwan Xiaomai.

Last Modified: 10/21/2014
Footer Content Back to Top of Page