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GrainGenes Reference Report: CPP-16-202

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Reference	CPP-16-202
Title	Identification of Cochliobolus sativus isolates expressing differential virulence on two-row barley genotypes from North Dakota
Journal	Canadian Journal of Plant Pathology
Year	1994
Volume	16
Pages	202-206
Author	Fetch TJ Steffenson B
Abstract	Severe spot blotch infection was observed in 1990 on several two-row barley breeding lines previously regarded as resistant to Cochliobolus sativus Studies were conducted to compare the virulence pattern of a C sativus isolate (ND90Pr) obtained from this two-row breeding nursery with one (ND85F) used in previous disease screening evaluations Greenhouse and field experiments were performed in 1991 and 1992 at Fargo, ND, using a split plot design with isolate as the main effect Isolates ND90Pr and ND85F exhibited distinct differential virulence patterns on barley genotypes ND 5883, ND 12437, ND 12720, ND 12721, and Bowman Isolate ND90Pr displayed high virulence on ND 12720, ND 12721, and Bowman, and low virulence on ND 5883 and ND 12437. In contrast, isolate ND85F was highly virulent on ND 5883 and ND 12437 and weakly virulent on ND 12720, ND 12721, and Bowman. Both isolates expressed low virulence on genotype ND B112, the primary source of resistance to C. sativus in commercial six-row barley germplasm. To incorporate adequate levels of resistance into future two-row barley cultivars, disease evaluations should be made with C. sativus isolates that express the full spectrum of virulence found in North Dakota.
Keyword	[ Hide all but 1 of 14 ] cochliobolus-sativus cultivar disease resistance disease-severity genetic resistance genotype hordeum vulgare host-specificity incidence infection lines north-dakota phenotype virulence

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