Genetic mapping of a major gene for leaf rust resistance in soft red winter wheat cultivar AGS 2000

Sapkota, Suraj; Hao, Yuanfeng; Johnson, J. W.; López, Benjamín Pineda; Bland, Dan; Chen, Zhenbang; Sutton, S.R.; Buck, James W.; Youmans, John D.; Mohamed, Maryati

doi:10.1007/s11032-018-0909-8

Cited by 17 publications

(30 citation statements)

References 46 publications

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“…Four P. triticina races (i.e., MFGKG, MBTNB, TCRKG, and MCTNB) representing the prevalent races of P. triticina in the southeastern United States were used to screen the wheat genotypes. MFGKG (virulent on the genes Lr1, Lr3,Lr9,Lr24,Lr26,Lr11,Lr10,Lr14a,Lr18,and Lr28) is currently the predominant race of P. triticina in GA (Sapkota et al, 2019;Kolmer, 2019). Furthermore, MBTNB (virulent on the genes Lr1, Lr3, Lr3ka, Lr11, Lr17, Lr30, LrB, and Lr14a), TCRKG (virulent on the genes Lr1, Lr2a,Lr2c,Lr3,Lr26,Lr3ka,Lr11,Lr30,Lr10,Lr14a,Lr18,and Lr28), and MCTNB (virulent on the genes Lr1, Lr3,Lr26,Lr3ka,Lr11,Lr17,Lr30,LrB,and Lr14a) are the most prevalent races of P. triticina in the southeastern United States (Kolmer and Hughes, 2016;Kolmer, 2019).…”

Section: Methodsmentioning

confidence: 99%

“…Genetic resistance is the most efficient, cost-effective, and environmentally sound method to control losses caused by LR. Seventy-nine LR resistance genes (Lr genes) have been cataloged (Bolton et al, 2008;Sapkota et al, 2019). However, because of the constant evolving and emergence of new virulent P. triticina races, identification of new resistance sources to LR is vital (Kolmer, 2005;Kertho et al, 2015).…”

Section: Genome-wide Association Study Of a Worldwidementioning

confidence: 99%

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Genome‐Wide Association Study of a Worldwide Collection of Wheat Genotypes Reveals Novel Quantitative Trait Loci for Leaf Rust Resistance

et al. 2019

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The Plant Genome T he world's human population is projected to reach over nine billion by 2050, which demands more food production to ensure food security by that time (Tucker et al., 2017). Wheat is a major food crop contributing about 20% of calories to the human population worldwide, and an increase in wheat production is imperative to address this challenge. Although overall genetic and genomic improvement in wheat is essential to significantly increase wheat production, development of wheat cultivars that are resistant to diverse plant diseases is also important. Among the major diseases of wheat, rust diseases, which include LR, stripe rust, and stem rust,

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Section: Methodsmentioning

confidence: 99%

Section: Genome-wide Association Study Of a Worldwidementioning

confidence: 99%

Genome‐Wide Association Study of a Worldwide Collection of Wheat Genotypes Reveals Novel Quantitative Trait Loci for Leaf Rust Resistance

et al. 2019

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“…Genetic resistance is therefore the preferred method to manage rust diseases. To date, 79 Lr genes and more than 200 QTLs, as well as 82 Yr genes and 140 QTLs have been identified for both seedling and adult plant LR and SR resistance, respectively (Rosewarne et al, 2013;McIntosh et al, 2017;Sapkota et al, 2019b).…”

Section: Epidemiology and Management Of Lr And Srmentioning

confidence: 99%

“…There have been few QTL mapping studies for rust resistance conducted in the southeast region. Three biparental QTL mapping studies were recently conducted for LR: one study looked at accessing seedling resistance (Sapkota et al, 2019b) and two focused on APR (Table 4) (Carpenter et al, 2017;Sapkota, 2019). The studies utilized RIL population (175-225 lines) and detected major QTL for LR resistance in 2BS (seedling), 1AL and 5B (APR) explaining 8.1-75.3% of phenotypic variations which were either validated or under validation for future use.…”

Section: Genetic Sources Of Lr and Sr Resistance In The Southeastmentioning

confidence: 99%

“…The studies utilized RIL population (175-225 lines) and detected major QTL for LR resistance in 2BS (seedling), 1AL and 5B (APR) explaining 8.1-75.3% of phenotypic variations which were either validated or under validation for future use. Among those, LrA2k recently mapped on chromosome 2BS from SRWW cultivar AGS 2000 confers a high level of LR resistance at the seedling stage (Sapkota et al, 2019b). Similarly, Lr2K38 has been mapped on 1AL chromosome from SRWW cultivar AGS 2038 and confers a high level of APR to LR (Sapkota et al, 2019).…”

Section: Genetic Sources Of Lr and Sr Resistance In The Southeastmentioning

confidence: 99%

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Fusarium Head Blight and Rust Diseases in Soft Red Winter Wheat in the Southeast United States: State of the Art, Challenges and Future Perspective for Breeding

et al. 2020

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Among the biotic constraints to wheat (Triticum aestivum L.) production, fusarium head blight (FHB), caused by Fusarium graminearum, leaf rust (LR), caused by Puccinia triticina, and stripe rust (SR) caused by Puccinia striiformis are problematic fungal diseases worldwide. Each can significantly reduce grain yield while FHB causes additional food and feed safety concerns due to mycotoxin contamination of grain. Genetic resistance is the most effective and sustainable approach for managing wheat diseases. In the past 20 years, over 500 quantitative trait loci (QTLs) conferring small to moderate effects for the different FHB resistance types have been reported in wheat. Similarly, 79 Lr-genes and more than 200 QTLs and 82 Yr-genes and 140 QTLs have been reported for seedling and adult plant LR and SR resistance, respectively. Most QTLs conferring rust resistance are race-specific generally conforming to a classical gene-for-gene interaction while resistance to FHB exhibits complex polygenic inheritance with several genetic loci contributing to one resistance type. Identification and deployment of additional genes/ QTLs associated with FHB and rust resistance can expedite wheat breeding through marker-assisted and/or genomic selection to combine small-effect QTL in the gene pool. LR disease has been present in the southeast United States for decades while SR and FHB have become increasingly problematic in the past 20 years, with FHB arguably due to increased corn acreage in the region. Currently, QTLs on chromosome 1B from

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A novel adult plant leaf rust resistance gene Lr2K38 mapped on wheat chromosome 1AL

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Soft red winter wheat (SRWW) cultivar AGS 2038 has a high level of seedling and adult plant leaf rust (LR) resistance. To map and characterize LR resistance in AGS 2038, a recombinant inbred line (RIL) population consisting of 225 lines was developed from a cross between AGS 2038 and moderately resistant line UGA 111729. The parents and RIL population were phenotyped for LR response in three field environments at Plains and Griffin, GA, in the 2017–2018 and 2018–2019 growing seasons, one greenhouse environment at the adult‐plant stage, and at seedling stage. The RIL population was genotyped with the Illumina iSelect 90K SNP marker array, and a total of 7667 polymorphic markers representing 1513 unique loci were used to construct a linkage map. Quantitative trait loci (QTL) analysis detected six QTL, QLr.ags‐1AL, QLr.ags‐2AS, QLr.ags‐2BS1, QLr.ags‐2BS2, QLr.ags‐2BS3, and QLr.ags‐2DS, for seedling and adult plant LR resistance. Of these, the major adult plant leaf rust resistance QTL, QLr.ags‐1AL, was detected on all field and greenhouse adult plant tests and explained up to 34.45% of the phenotypic variation. QLr.ags‐1AL, tightly flanked by IWB20487 and IWA4022 markers, was contributed by AGS 2038. Molecular marker analysis using a diagnostic marker linked to Lr59 showed that QLr.ags‐1AL was different from Lr59, the only known LR resistance gene on 1AL. Therefore, the QTL was temporarily designated as Lr2K38. Lr2K38‐linked marker IWB20487 was highly polymorphic among 30 SRWW lines and should be useful for selecting the Lr2K38 in wheat breeding programs.

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Genetic mapping of a major gene for leaf rust resistance in soft red winter wheat cultivar AGS 2000

Cited by 17 publications

References 46 publications

Genome‐Wide Association Study of a Worldwide Collection of Wheat Genotypes Reveals Novel Quantitative Trait Loci for Leaf Rust Resistance

Genome‐Wide Association Study of a Worldwide Collection of Wheat Genotypes Reveals Novel Quantitative Trait Loci for Leaf Rust Resistance

Fusarium Head Blight and Rust Diseases in Soft Red Winter Wheat in the Southeast United States: State of the Art, Challenges and Future Perspective for Breeding

A novel adult plant leaf rust resistance gene Lr2K38 mapped on wheat chromosome 1AL

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