Mapping of Defense Response Gene Homologs and Their Association with Resistance Loci in Maize |
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Authors: | Gui-Xiang Wang Yu Chen Jiu-Ran Zhao Lin Li Schuyler S Korban Feng-Ge Wang Jian-Sheng Li Jin-Rui Dai Ming-Liang Xu |
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Institution: | (National Maize Improvement Center of China, China Agricultural University;, Beijing 100094, China;Maize Research Center, Beijing Academy of Agricultural Sciences;, Beijing 100089, China;Department of Natural Resources and Environmental Sciences, University of Illinois;, Urbana, IL 61801, USA ) |
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Abstract: | Defense response genes in higher plant species are involved in a variety of signal tranaduction pathways and biochemical reactions to counterattack invading pathogens. In this study, a total of 366 non-redundant defense response gene homologs (DRHs), Including 124 unigenes/expressed sequence tags, 226 tentative consensuses, and 16 DRH contigs have been identified by mining the Maize Genetics and Genomics and The Institute for Genomic Research maize databases using 35 essential defense response genes. Of 366 DRHs, 202 are mapped to 152 loci across ten maize chromosomes via both the genetic and in silico mapping approaches. The mapped DRHs seem to cluster together rather than be evenly distributed along the maize genome. Approximately half of these DHRs are located in regions harboring either major resistance genes or quantitative trait loci(QTL). Therefore, this comprehensive DRH linkage map will provide reference sequences to Identify either positional candidate genes for resistance genes and/or QTLs or to develop makers for fine-mapping and marker-assisted selection of resistance genes and/or QTLs. |
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Keywords: | defense response gone disease resistance maize molecular mapping |
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