Theoretical and Applied Genetics (2008) 116, 1145-1153

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Srinivasachary, N. Gosman, A. Steed, J. Simmonds, M. Leverington-Waite, Y. Wang, J. Snape and P. Nicholson (2008)
Susceptibility to Fusarium head blight is associated with the Rht-D1b semi-dwarfing allele in wheat
Theoretical and Applied Genetics 116 (8), 1145-1153
Abstract: Fusarium head blight (FHB) is an important disease of wheat worldwide. The cultivar Spark is more resistant than most other UK winter wheat varieties but the genetic basis for this is not known. A mapping population from a cross between Spark and the FHB susceptible variety Rialto was used to identify quantitative trait loci (QTL) associated with resistance. QTL analysis across environments revealed nine QTL for FHB resistance and four QTL for plant height (PH). One FHB QTL was coincident with the Rht-1D locus and accounted for up to 51% of the phenotypic variance. The enhanced FHB susceptibility associated with Rht-D1b is not an effect of PH per se as other QTL for height segregating in this population have no influence on susceptibility. Experiments with near-isogenic lines supported the association between susceptibility and the Rht-D1b allele conferring the semi-dwarf habit. Our results demonstrate that lines carrying the Rht-1Db semi-dwarfing allele are compromised in resistance to initial infection (type I resistance) while being unaffected in resistance to spread within the spike (type II resistance).
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Paul Nicholson

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host
molecular biology - genes

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Fusarium culmorum Wheat (Triticum) United Kingdom
Fusarium graminearum Wheat (Triticum) United Kingdom