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GrainGenes Reference Report: TAG-109-215

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Reference	TAG-109-215
Title	Molecular mapping of resistance to Fusarium head blight in the spring wheat cultivar Frontana
Journal	Theoretical and Applied Genetics
Year	2004
Volume	109
Pages	215-224
Author	Steiner B [ Show all 6 ]
Abstract	Summary: Fusarium head blight (FHB) is a destructive disease of wheat. The objective of this study was to characterise the FHB resistance of the Brazilian spring wheat cultivar Frontana through molecular mapping. A population of 210 doubled-haploid lines from a cross of Frontana (partially resistant) and Remus (susceptible) was evaluated for FHB resistance during three seasons. Spray and single-spikelet inoculations were applied. The severity, incidence and spread of the disease were assessed by visual scoring. The population was genotyped with 566 DNA markers. The major QTL effect associated with FHB resistance mapped to chromosome 3A near the centromere, explaining 16% of the phenotypic variation for disease severity over 3 years. The most likely position is in the Xgwm720-Xdupw227 interval. The genomic region on 3A was significantly associated with FHB severity and incidence in all years evaluated, but not with FHB spread, indicating the prominent contribution of this QTL to resistance against initial infection. The map interval Xgwm129-Xbarc197 on chromosome 5A also showed consistent association with FHB severity and accounted for 9% of the phenotypic variation. In addition, smaller effects for FHB severity were identified on chromosomes 1B, 2A, 2B, 4B, 5A and 6B in single years. Individual QTLs for resistance to FHB spread accounted for less than 10% of the variation in trait expression. The present study indicates that FHB resistance of Frontana primarily inhibits fungal penetration (type I resistance), but has a minor effect on fungal spread after infection (type II resistance)
External Databases	Pubmed: 14997302
Keyword	[ Hide all but 1 of 42 ] 1b barley blight brazilian centromere chromosome chromosome 5a cultivar deoxynivalenol disease dna doubled haploid doubled haploid lines ear blight frontana fusarium fusarium head blight genetic analysis genomic region head blight head-blight infection inoculation interval major qtl map mapping microsatellite marker molecular mapping penetration phenotypic variation population position quantitative trait loci resistance resistant scab resistance severity spread spring wheat susceptible winter wheat

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