Characterization of Slow Rusting Resistance Against Stem Rust (Puccinia graminis f. sp. tritici) in Selected Bread Wheat Cultivars of Ethiopia

Mitiku, Mengistu; Hei, Netsanet Bacha; Abera, Merkuz

doi:10.4172/2329-8863.1000389

Cited by 8 publications

(8 citation statements)

References 36 publications

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“…Accordingle, they were classified into three groups of slow rusting resistance based on the level of severity as having high, moderate and low partial resistance for genotypes showing 1-30 %, 31-50 % and >50 % TRS, respectively (Safavi, 2012). In the first case, a consideraple number of wheat lines (25 in total) falls under a high partial resistance groups indicating presence of potentially diverse group of durum wheat lines confering some degree of resistance against the rust disease in Ethiopia as previously reported (Mitiku et al, 2018). Durum heat with a moderately partial resistance terminal disease severity constitutes 49 lines which may also be important for exploring stem rust resistance.…”

Section: Infection Response and Terminal Disease Severitymentioning

confidence: 72%

Adult Genes Evaluation of Ethiopian Durum Accessions for Resistance to Stem Rust (Puccinia graminis f.sp. tritici)

2022

JBAH

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The horizontal resistance is effective against broad range of pathogen races and even reduces the costs of fungicides for controlling.The objective of present study is based on the field assesment of adult resistance genes in Ethiopia durum wheat accessions for resistance to stem rust (Puccinia graminis f.sp. tritici). The 142 durum wheat accessions were obtained from the Ethiopian Biodiversity Institute and screening for stem rust in Debrezeit agricultural research experimental fields using alpha lattice design. The bulk of races (TTKSK (Ug99), TTTTF, TTRTF, JRCQC, TKTTF) inoculated during stem elongation stage. The disease assessment started the first symptom of seen in infector rows. In the field, durum accessions were examined utilizing for slow rust parameters. Accordingly, to that the 23 accessions were identified having low value of terminal rust resistance, low average coefficient of infection and low area under disease progress curve. The grain yield is negative and highly siginificant associated with slow rusting parameters. These accessions considered as having adult resistance genes with high partial resistance genes and important for further resistance breeding.

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Section: Infection Response and Terminal Disease Severitymentioning

confidence: 72%

Adult Genes Evaluation of Ethiopian Durum Accessions for Resistance to Stem Rust (Puccinia graminis f.sp. tritici)

2022

JBAH

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“…Ethiopia is considered to be a hotspot for the development of Pgt race diversity and frequent disease epidemics. Studies carried out in Ethiopia showed that most previously identified races such as TTKSK, TKTTF, TTTTF, TRTTF, RRTTF, and others were virulent on most varieties grown in the country [ 38 ]. Accordingly, many field evaluation studies for Pgt response have been carried out in different wheat-growing regions of the country [ 22 , 39 , 40 ].…”

Section: Discussionmentioning

confidence: 99%

Genetic characterization and genome-wide association mapping for stem rust resistance in spring bread wheat

et al. 2022

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Background Emerging wheat stem rust races have become a major threat to global wheat production. Finding additional loci responsible for resistance to these races and incorporating them into currently cultivated varieties is the most economic and environmentally sound strategy to combat this problem. Thus, this study was aimed at characterizing the genetic diversity and identifying the genetic loci conferring resistance to the stem rust of wheat. To accomplish this, 245 elite lines introduced from the International Center for Agricultural Research in the Dry Areas (ICARDA) were evaluated under natural stem rust pressure in the field at the Debre Zeit Agricultural Research Center, Ethiopia. The single nucleotide polymorphisms (SNP) marker data was retrieved from a 15 K SNP wheat array. A mixed linear model was used to investigate the association between SNP markers and the best linear unbiased prediction (BLUP) values of the stem rust coefficient of infection (CI). Results Phenotypic analysis revealed that 46% of the lines had a coefficient of infection (CI) in a range of 0 to 19. Genome-wide average values of 0.38, 0.20, and 0.71 were recorded for Nei’s gene diversity, polymorphism information content, and major allele frequency, respectively. A total of 46 marker-trait associations (MTAs) encompassed within eleven quantitative trait loci (QTL) were detected on chromosomes 1B, 3A, 3B, 4A, 4B, and 5A for CI. Two major QTLs with –log10 (p) ≥ 4 (EWYP1B.1 and EWYP1B.2) were discovered on chromosome 1B. Conclusions This study identified several novel markers associated with stem rust resistance in wheat with the potential to facilitate durable rust resistance development through marker-assisted selection. It is recommended that the resistant wheat genotypes identified in this study be used in the national wheat breeding programs to improve stem rust resistance.

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“…1B, 1E). Based on the previous study for resistance characterization of Pgt made on Ethiopian bread wheat cultivars, 13 cultivars (Shorima, Hulluka, Hoggana, Galil, Senkegna, Hidase, Tay, Dinkinesh, Gassay, Millenium, Densa, Guna and Shina) showed CI values between 0 and 20 and were designated as having a high level of slow rusting [28].…”

Section: Discussionmentioning

confidence: 99%

“…Ethiopia is considered as a hot-spot area for development of Pgt race diversity and frequent disease epidemics. Studies carried out in Ethiopia showed that most previously identified races such as TTKSK, TKTTF, TTTTF, TRTTF, RRTTF, and others were virulent on most varieties grown in the country [28]. Accordingly, many field evaluation studies for Pgt response have been carried out in different wheat growing-regions of the country [21][29] [30].…”

Section: Discussionmentioning

confidence: 99%

Genetic Characterization and Genome-Wide Association Mapping for Stem Rust Resistance in Spring Bread Wheat

Shewabez

Bekele

Alemu

et al. 2021

Preprint

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Background Emerging wheat stem rust races has become a major threat to global wheat production. Finding additional loci responsible for resistance to these races and incorporating them into currently cultivated varieties is the most economical and environmentally sound strategy to combat this problem. Thus, this study aimed to characterize the genetic diversity of wheat and to identify the genetic loci conferring resistance to stem rust of wheat. To accomplish this study, 245 elite lines introduced from the International Center for Agricultural Research in the Dry Areas (ICARDA) were tested under natural stem rust pressure in the field at the Debre Zeit Agricultural Research Center, Ethiopia. The SNP marker data was retrieved from a 15K SNP wheat array. Association analysis was undertaken between SNP markers and best linear unbiased prediction (BLUP) value of the stem rust coefficient of infection (CI) using a mixed linear model. Results Phenotypic analysis revealed 46% of lines had a coefficient of infection (CI) between 0 to 19. An average 0.38 in Nei’s gene diversity, 0.20 in polymorphism information content, and 0.71 in major allele frequency of the whole genome were identified.A total of 46 marker-trait associations (MTAs) that were encompassed within 13 quantitative trait loci (QTL) on chromosomes 1B, 3A, 3B, 4A, 4B, and 5A were found for CI. Four major QTLs with –log10 (p) ≥ 3 (EWYP1B.1, EWYP1B.3, EWYP1B.4, and EWYP1B.5) were identified on chromosome 1B. Conclusions This study contributes several novel markers associated with stem rust resistance. These can be further facilitating durable rust resistance development through marker-assisted selection. The resistant wheat genotypes identified in this study are recommended to be used in the national wheat breeding programs to improve stem rust resistance. Key words: markers; Puccinia graminis f. sp. tritici; QTL

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Characterization of Slow Rusting Resistance Against Stem Rust (Puccinia graminis f. sp. tritici) in Selected Bread Wheat Cultivars of Ethiopia

Cited by 8 publications

References 36 publications

Adult Genes Evaluation of Ethiopian Durum Accessions for Resistance to Stem Rust (Puccinia graminis f.sp. tritici)

Adult Genes Evaluation of Ethiopian Durum Accessions for Resistance to Stem Rust (Puccinia graminis f.sp. tritici)

Genetic characterization and genome-wide association mapping for stem rust resistance in spring bread wheat

Genetic Characterization and Genome-Wide Association Mapping for Stem Rust Resistance in Spring Bread Wheat

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