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ARS Home Midwest Area West Lafayette, Indiana Crop Production and Pest Control Research Research Publications at this Location





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Title:   Author  item
                                            WARE, SARAH - PLANT RES. INTERN. NETHERitem
                                            WITTENBERG, ALEXANDER - PLANT RES. INT. NETHERLANitem
                                            VERSTAPPEN, ELS - PLANT RES. INT. NETHERitem
                                            VAN DER LEE, THEO - PLANT RES. INT. NETHERitem
                                            SCHOUTEN, HENK - PLANT RES. INT. NETHERitem
                                            Goodwin, Stephen

                                                         - *Steve*item
                                            GRIMWOOD, JANE - STANFORD HUMAN GEN. CTRitem
                                            BRISTOW, JIM - DOE-JOINT GEN. INST.item
                                            GRIGORIEV, IGOR - DOE-JOINT GEN. INST.item
                                            KEMA, GERT - PLANT RES. INT. NETHER
  Submitted to: Plant and Animal Genome VX Conference Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 12/15/2006
                                    Publication  Date: 1/13/2007
                                    Citation: Ware, S.B., Wittenberg, A.H., Verstappen, E.C., Van Der Lee, T., Schouten, H.J., Goodwin, S.B., Grimwood, J., Bristow, J., Grigoriev, I., Kema, G.H. 2007. Characterization of chromosomal regions containing quantitive trait loci determining specificity towards bread and durum wheat cultivars in the fungal wheat pathogen Mycosphaerella graminicola. [abstract] Plant and Animal Genome VX Conference. Abstract W360.  Available: http://www.intlpag.org/15/abstracts/PAG15_W56_360.htmlInterpretive Summary:
                                Technical Abstract: Specificity of the haploid, plant-pathogenic fungus Mycosphaerella graminicola towards durum (tetraploid, genomes AABB) versus bread (AABBDD) wheat is well documented. To estimate the number of genes involved in host species specificity, we crossed an isolate of M. graminicola collected from bread wheat (IPO323) with one from durum wheat (IPO95052) and analyzed the pathogenicity of 163 progeny to four cultivars of bread wheat and three of durum. Segregation data for pathogenicity to the seven cultivars of wheat were added to a high-density genetic linkage map containing 1,144 Diversity Array Technology (DArT) markers. Combined analyses of the phenotypic data and the DArT map identified nine quantitative trait loci (QTL) for cultivar specificity on seven linkage groups. These genetic loci were aligned to the whole-genome sequence of M. graminicola to identify the genes involved in specificity. To our knowledge, this is the first comprehensive QTL analysis of virulence performed on a plant-pathogenic fungus. The previously accepted hypothesis that host species specificity among isolates of M. graminicola is under control of a single gene appears to be incorrect. Instead, specificity of M. graminicola to durum versus bread wheat appears to be under multigenic control. Therefore, pathogenicity to different species of cultivated wheat most likely is conditioned by a mix of genetically inherited factors, and the distinction between host species and cultivar specificity is not clearly defined.


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