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Tadesse, Z.

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Tadesse
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Tadesse, Z.

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    Climate smart bread wheat (Triticum aestivum L.) variety development for optimum moisture areas of Ethiopia
    (Puspa Publishing House, 2023) Alemu, G.; Dabi, A.; Sime, B.; Geleta, N.; Delesa, A.; Zegaye, H.; Duga, R.; Kasahun, C.; Negash, T.; Solomon, T.; Zewdu, D.; Asefa, B.; Tadesse, Z.; Abeyo Bekele Geleta; Badebo, A.; Bayisa, T.
    Publication
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    Characterization of Ethiopian wheat germplasm for resistance to four Puccinia graminis f. sp. tritici races facilitated by single-race nurseries
    (American Phytopathological Society (APS), 2019) Kotu, B.H.; Girma, B.; Tadesse, Z.; Edae, E.A.; Olivera Firpo, P.D.; Hailu, E.; Worku Denbel Bulbula; Abeyo Bekele Geleta; Badebo, A.; Cisar, G.; Brown-Guedira, G.; Gale, S.; Yue Jin; Rouse, M.N.
    In Ethiopia, breeding rust resistant wheat cultivars is a priority for wheat production. A stem rust epidemic during 2013 to 2014 on previously resistant cultivar Digalu highlighted the need to determine the effectiveness of wheat lines to multiple races of Puccinia graminisf. sp. tritici in Ethiopia. During 2014 and 2015, we evaluated a total of 97 bread wheat and 14 durum wheat genotypes against four P. graminis f. sp. tritici races at the seedling stage and in single-race field nurseries. Resistance genes were postulated using molecular marker assays. Bread wheat lines were resistant to race JRCQC, the race most virulent to durum wheat. Lines with stem rust resistance gene Sr24 possessed the most effective resistance to the four races. Only three lines with adult plant resistance possessed resistance effective to the four races comparable with cultivars with Sr24. Although responses of the wheat lines across races were positively correlated, wheat lines were identified that possessed adult plant resistance to race TTKSK but were relatively susceptible to race TKTTF. This study demonstrated the importance of testing wheat lines for response to multiple races of the stem rust pathogen to determine if lines possessed non-race-specific resistance.
    Publication
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    Markers linked to wheat stem rust resistance gene Sr11 effective to puccinia graminis f. sp. tritici Race TKTTF
    (American Phytopathological Society (APS), 2016) Nirmala, J.; Chao, S.; Olivera Firpo, P.D.; Babiker, E.M.; Abeyo Bekele Geleta; Tadesse, Z.; Imtiaz, M.; Talbert, L.E.; Blake, N.K.; Akhunov, E.; Pumphrey, M.; Jin, Y.; Rouse, M.N.
    Wheat stem rust, caused by Puccinia graminis f. sp. tritici, can cause severe yield losses on susceptible wheat varieties and cultivars. Although stem rust can be controlled by the use of genetic resistance, population dynamics of P. graminis f. sp. tritici can frequently lead to defeat of wheat stem rust resistance genes. P. graminis f. sp. tritici race TKTTF caused a severe epidemic in Ethiopia on Ug99-resistant ‘Digalu’ in 2013 and 2014. The gene Sr11 confers resistance to race TKTTF and is present in ‘Gabo 56’. We identified seven single-nucleotide polymorphism (SNP) markers linked to Sr11 from a cross between Gabo 56 and ‘Chinese Spring’ exploiting a 90K Infinium iSelect Custom beadchip. Five SNP markers were validated on a ‘Berkut’/‘Scalavatis’ population that segregated for Sr11, using KBioscience competitive allele-specific polymerase chain reaction (KASP) assays. Two of the SNP markers, KASP_6BL_IWB10724 and KASP_6BL_IWB72471, were predictive of Sr11 among wheat genetic stocks, cultivars, and breeding lines from North America, Ethiopia, and Pakistan. These markers can be utilized to select for Sr11 in wheat breeding and to detect the presence of Sr11 in uncharacterized germplasm.
    Publication