Mapping resistance to Argentinean Fusarium (graminearum) head blight in the ITMI set of Double Haploid Recombinant lines of wheat

LORI G., SGARBI C, A. BORNER, CASTRO A.M.

Wernigerode

Congreso; EUCARPIA (Cereal Section)- ITMI Joint Conference 2014; 2014

IPK

Fusarium head blight (FHB) of wheat has become a serious threat to wheat crops in numerous countries with reductions of yield and quality. The current genetic base of resistance to FHB is mainly based on Sumai3 genes worldwide. Argentinean wheats are usually subjected to FHB with losses that range from 10 to 42% of the production. To accelerate the improvement of scab tolerance in wheat is critical to search for new sources of resistance, since populations of F. graminearum are highly heterogeneous. This research was aimed at assessing the ITMI mapping population of 114 RILs for type I and II of resistance against a wide population of Argentinean isolates of F. graminearum. Trials were carried out during five years. The severity (S), the Fusarium Index (FI), the 1000 weight grains (TWG) and the Fusarium damaged kernels (FDK) were recorded in three sets of ITMI population subjected to inoculation for type I or II of resistance and in control plants without inoculation. The cultivar Sumai3 was used as a resistant control. There were highly significant differences between both parents of the RILs, with Synthetic showing similar values to Sumai3 for the different traits evaluated. Several of the assessed traits showed significant association to molecular markers of ITMI mapping population. Two major QTLs explained the variability for both types of resistance. Several additional QTLs with effects of lower magnitude have also been identified. The increasing alleles provided by Synthetic contributed to Argentinean population of F. graminearum resistance. These new genes could be incorporated into wheat genotypes already carrying other genes conferring tolerance to FHB that will result in gene pyramiding to control this pathogen.