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GrainGenes Reference Report: PHY-94-497

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Reference	PHY-94-497
Title	Partial resistance to septoria tritici blotch (Mycosphaerella graminicola) in wheat cultivars arina and riband
Journal	Phytopathology
Year	2004
Volume	94
Pages	497-504
Author	Chartrain L Brading PA Widdowson JP Brown JKM
Abstract	Summary: Partial resistance to Septoria tritici blotch (STB) and its inheritance were investigated in a doubled-haploid population of a cross between cvs. Arina and Riband. The former has good partial resistance whereas the latter is susceptible. In adult plant trials in polytunnels, STB disease scores were negatively correlated with heading date. Resistance was not specific to any of the three fungal isolates used in these tests. A quantitative trait locus (QTL) for partial resistance to STB was identified in Riband on chromosome 6B and is named QStb.psr-6B-1. No QTL controlling a major part of the Arina resistance was identified, suggesting that its resistance may be dispersed and polygenic. There was no correlation between the lines' mean disease scores at the seedling and adult stages, implying that partial resistance to STB is developmentally regulated. Seedling resistance to the isolate IPO323 was isolate-specific and controlled by a single gene in Arina, probably allelic with the Stb6 gene in cv. Flame that confers resistance to the same isolate. The implications of these results for wheat breeding programs are discussed
Keyword	[ Hide all but 1 of 44 ] adult adult-plant resistance blotch breeding breeding program breeding programs chromosome confers confers resistance date disease disease resistance doubled haploid doubled-haploid population gene genetic-variation heading host cultivars inheritance isolate its leaf blotch locus mycosphaerella graminicola partial resistance population powdery mildew puccinia hordei qtl quantitative trait quantitative trait loci quantitative trait locus quantitative-trait-locus resistance rust resistance seedling seedling resistance septoria tritici septoria tritici blotch specific susceptible tritici wheat breeding winter wheat

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