Stripe rust caused by Puccinia striiformis f.sp. tritici is one of the major constraints of wheat production worldwide. The most recent epidemics was occurred in 2010 in major wheat growing regions of central, west Asia, north and sub-Saharan Africa causing significant yield losses because of breakdown of resistance in predominantly cultivated wheat varieties (e.g. Kubsa/Attila and Galama in Ethiopia and Cham-8 in Syria). The major cause might be the narrow genetic base on which the breeding for resistance has been founded. Many control measures have been used to minimize the losses incurred by yellow rust but use of resistant cultivars remains the most economical, efficient and environment and farmer friendly strategy. To broaden the genetic basis of wheat cultivars, it is important to collect, evaluate and document new source of resistance genes from wild relatives of wheat including Triticum and Aegilops species. Synthetic hexaploid wheat (SHW) is a valuable genetic resource for resistance to a range of biotic stresses. A total of 653 SHWs derived from Aegilops tauschii and Triticum turgidum subsp. durum were evaluated for resistance to yellow rust in Meraro and Kulumsa, Ethiopia, at the adult plant growth stage. Of these, 644 entries were further tested on wheat cultivars carrying Yr2, Yr6, Yr7, Yr9, YrA, Yr25 and Yr27 against stripe rust isolates virulent on these genes at the seedling growth stage of 116 exhibited resistant to moderately resistant reaction under field conditions in both locations. Of these, 40 and 76 SHWs showed susceptible and resistant reactions at the seedling stage, respectively. The resistant SHWs identified could be useful in broadening the genetic bases of stripe resistance and further characterized to uncover potentially new resistance gene(s) in SHWs effective against prevalent races currently attacking wheat in Ethiopia and other stripe rust countries in the region.
Multi-environment trials were carried out at 11 locations in different wheat growing zones of Ethiopia during 2017–18 and 2018–19 to identify high yielding, stable, biotic and abiotic stresses resistant varieties with improved quality traits for commercial release. Twenty-eight advanced bread wheat genotypes have been evaluated against two released bread wheat varieties. The experiment was laid out using alpha lattice design with three replications. Nine stability models were employed in order to assess stability and performance of 28 advanced bread wheat genotypes across 18 diverse environments. Combined analysis of variance for grain yield has revealed that the environments, the genotypes and GEI effects were significantly different (p<0.001). Environments, GEI and Genotypic effects accounted for 71.99%, 22.97% and 5.03% of the total grain yield variation, respectively. Significant GEI showed variable performance of genotypes across environments. Eight advanced bread wheat genotypes namely ETBW8595, ETBW8668, ETBW8751, ETBW8991, ETBW8996, ETBW9547, ETBW9553 and ETBW9554 produced grain yield of more than 5.0 t ha-1, indicating their superior yielding potential. ETBW8595, ETBW8668, ETBW8751, ETBW8991 and ETBW9554 were found the most stable bread wheat genotypes as confirmed by five to eight stability models. ETBW8751, ETBW8991 and ETBW9554 were highest yielding, stable, adaptable, resistant and moderately resistant to prevailing stem and yellow rust diseases. Thus, these three genotypes were the most promising advanced bread wheat genotypes to be verified and released in Ethiopia. These promising bread wheat genotypes can be included in multipurpose bread wheat crossing blocks in order to correct shortcomings of commercial varieties.
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