Mapping QTLs associated with FHB resistance in a Wangshuibai i. Nanda24l9 population

摘要

Scab disease (Fusarium head blight, FHB), caused by Fusarium species, has been a major concern for both wheat producers and farmers. To identify genes for scab resistance, a RIL population derived from 'Wangshuibai' x 'Nanda2419' were produced by single seed descent (SSD). The RILs were evaluated for scab resistance in the field by artificial or natural inoculation in two-year experiments. Using the partial molecular map constructed with 218 loci that covered over 1736 cM of the wheat genome, nine chromosome regions showing association with type II resistance were identified. The QTL linked to Xs 1021m on 2B, and those linked to Xgm533-3 (on 3B/7B), Xwmc341 on 6B and Xharc076 on 7D were consistent across the years. The latter three had their resistance alleles contributed by Wangshuibai. Eight QTLs were identified for the percentage of infected spikes (PIS) in the condition of natural inoculation that represents the type I resistance. Six of the type I resistance QTLs were from Wangshuibai, among which the one linked to Xbarc056 on 5A was most significant and explained 22.3% of the phenotypic variation.