Partial resistance to powdery mildew and leaf rust of wheat in Egyptian and CIMMYT genotypes

Abstract

Powdery mildew caused by Blumeria graminis f. sp. tritici and leaf rust caused by Puccinia triticina are among the most important widespread diseases of wheat (Triticum spp.). Seedling and adult plant partial resistance were assessed for both diseases in 46 wheat genotypes, including 20 Egyptian cultivars and 26 CIMMYT genotypes, during two growing seasons (2018/19 and 2019/20) in Egypt. Four Egyptian cultivars (cvs), Misr-1, Misr-2, Misr-3, Giza-171 and eight CIMMYT genotypes, Jupateco-73-R, Pavon-F-76, Opata-85, Thew, Kiskadee-1, Chewink-1, Exchange, Quaiu-1 showed partial resistance to both diseases at the seedling stage. They recorded the longest incubation period (IP) and latent period (LP) for both diseases. Seven

Genome-Wide Screening of Broad-Spectrum Resistance to Leaf Rust (Puccinia triticina Eriks) in Spring Wheat (Triticum aestivum L.)

“…with ITs of 0 and 2, respectively. The presence of Lr46 gene in the Sakha-94 Egyptian wheat cultivar was reported previously ( Draz and Abd El-Kreem, 2021 ). However, due to the highly susceptible reaction of this genotype in Exp.S.I.…”

“…Unfortunately, these genes were not included in the near isogenic lines evaluation due to seed lack. However, no previous studies postulated the presence of any of these genes in the Egyptian wheat germplasm ( Draz et al, 2015 , 2021 ; Atia et al, 2021 ; Draz and Abd El-Kreem, 2021 ). Furthermore, non of the 15 identified effective genes was mapped on this chromosome.…”

“…As LR is considered as a serious problem affecting wheat planting in Egypt long time ago, continuous mutations in the fungus and the plant to overcome each other were happened. Furthermore, many studies have been done to improve wheat resistance against LR under Egyptian conditions ( Imbaby et al, 2014 ; Draz et al, 2015 , 2021 ; Atia et al, 2021 ; Draz and Abd El-Kreem, 2021 ). Therefore, the presence of many MTAs across spring wheat genome is not a surprising result.…”

Deciphering field resistance to powdery mildew and yellow rust among popular cultivars of wheat and set of differential lines

“…NIL Pm2, NIL Pm3b and H 56771 with IT= '1' were highly resistant whereas, genotypes NIL Pm3c, CITR 15888 (Pm3f), Soissons (Pm3g), Wembley (Pm12), NC96BGTA5 (Pm 25), IWP 94 (Lr 23), TD 1, TD 4, TD 5, TD 6, TD 8, TD 12, TD 19, TD 20, UP 2382 and CMH 77.308 showing IT= '2' were moderately resistant. As has been observed in the present studies, seedling resistance to PM was reported in four Egyptian cultivars (Draz and El-Kreem 2021) and eight CIMMYT and 6 wheat 'Alcedo'-Ae. markgrafii chromosome disomic addition lines (Niu et al 2018), Indian advanced wheat breeding material (Basandrai et al 2016;Sood et al 2020).…”

Role of Environmental Conditions on Epidemics of Wheat Yellow Rust in Gharbia Governorate, Egypt.

“…Favorable climatic conditions include different variables i.e. temperature, relative humidity(RH), and rain precipitation, which leads to an increasing threat of the disease (El Jarroudi et al, 2017;Bita and Farhad, 2019;Draz and Abd El-Kreem, 2021). The duration of the favorable temperature and moisture during wheat growth plays an important role in increasing yellow rust epidemics (van den Berg and van den Bosch, 2007).…”