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ARS Home » Plains Area » Manhattan, Kansas » Center for Grain and Animal Health Research » Hard Winter Wheat Genetics Research » Research » Publications at this Location » Publication #320913

Research Project: Genetic Improvement of Hard Winter Wheat to Biotic and Abiotic Stresses

Location: Hard Winter Wheat Genetics Research

Title: Fusarium head blight resistance loci in a stratified population of wheat landraces and varieties

Author
item Tao, Li
item Dadong, Zhang
item Xiali, Zhou
item Bai, Guihua
item Lei, Li
item Shiliang, Gu

Submitted to: Euphytica
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 8/11/2015
Publication Date: 8/29/2015
Publication URL: http://handle.nal.usda.gov/10113/5491321
Citation: Tao, L., Dadong, Z., Xiali, Z., Bai, G., Lei, L., Shiliang, G. 2015. Fusarium head blight resistance loci in a stratified population of wheat landraces and varieties. Euphytica. 207:551. doi:10.1007/s10681-015-1539-4.

Interpretive Summary: Wheat Fusarium head blight (FHB) is a destructive disease of wheat worldwide. Extensive search for wheat FHB resistance identified that some Chinese and Japanese landraces showed the highest levels of resistance. To characterize the resistance genes in Chinese and Japanese wheat landraces and varieties, we assembled an association panel with 195 wheat accessions mainly from the two countries. The panel was genotyped with DNA markers, and evaluated for type II FHB resistance. Population structure analysis stratified this population into five groups. Association analysis identified 11 DNA markers associated with FHB resistance. Most of these markers can be traced to known quantitative trait loci (QTLs) for FHB resistance except markers Xgdm138-5DS and Xgwm358-5DS that are likely linked to a novel QTL on chromosome 5D. Mean FHB severities increased with decreasing numbers of favorable alleles at reproducible QTL. The resistance loci characterized here will further diversify the wheat FHB resistance gene pool, and provide breeders with additional sources of resistance for improvement of FHB resistance in wheat.

Technical Abstract: To determine if Chinese and Japanese wheat landraces and varieties have unique sources of Fusarium head blight (FHB) resistance, an association mapping panel of 195 wheat accessions including both commercial varieties and landraces was genotyped with 364 genome-wide simple sequence repeat (SSR) and sequence-tagged site (STS) markers, and evaluated for type II FHB resistance in three greenhouse experiments using single floret inoculation. Population structure analysis stratified this population into five groups with Chinese landraces in four groups. Thirty-two of 51 Chinese landraces and 24 of 27 Japanese accessions were placed in one group. Association analysis using a mixed model identified 11 markers having significant associations with FHB resistance in at least two experiments. Most of these markers coincided with known quantitative trait loci (QTL) for FHB resistance with one potentially novel QTL associated with Xgdm138-5DS and Xgwm358-5DS. Xbarc19-3AS was significant in all three experiments, and the frequency of favorable alleles was more than 53%. Chinese landraces and Japanese accessions had more favorable alleles at the majority of reproducible marker loci. Nine QTL combinations were identified according to the number of favorable alleles. Mean FHB severities increased with decreasing numbers of favorable alleles at reproducible loci. The resistance loci characterized here will further diversify the wheat FHB resistance gene pool, and provide breeders with additional sources of resistance for improvement of FHB resistance in wheat.