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Genome-Wide Analysis of Genes Induced by Fusarium graminearum Infection in Resistant and Susceptible Wheat Cultivars

, : Genome-Wide Analysis of Genes Induced by Fusarium graminearum Infection in Resistant and Susceptible Wheat Cultivars. Journal of Plant Biology 55(1): 64-72

Fusarium head blight (FHB) caused by Fusarium graminearum is one of the most serious diseases in wheat (Triticum aestivum) and barley (Hordeum vulgare). Dahongmil is an elite Korean wheat cultivar with relatively high resistance to FHB. To identify differentially expressed genes in the resistant cultivar Dahongmil and the susceptible cultivar Urimil after inoculation of F. graminearum, we used the Affymetrix GeneChip Wheat Genome Array to identify 328 ESTs that were differentially expressed in inoculated seedling tissues of the two cultivars. From these, we selected 16 induced genes and found that they have defense functions, such as genes encoding pathogen resistance proteins, oxidative stress-related proteins, metabolism, and proteins involved in defense mechanisms. To verify the DNA microarray results, we tested seven of these genes by semiquantitative RT-PCR and confirmed that these defense- and stress-related genes were expressed at much higher levels in the resistant Dahongmil cultivar. We next developed a hypothetical functional gene network and identified 89 interaction pairs mediated by four of the differentially expressed genes in the hypothetical network. We further refined the network by identifying nine genes showing significant up- or down-regulation after FHB challenge in the resistant cultivar and two genes having multiple interactions with queried proteins. We hope that the set of induced genes identified in this study can be used for development of new wheat and barley cultivars with improved resistance to FHB.

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Accession: 036230936

DOI: 10.1007/s12374-011-9190-7

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