Diverse sources of resistance to leaf rust in durum wheat

Mishra, A. N.; Kaushal, Kamini; Dubey, Vijay; Prasad, S. V. Sai

doi:10.5958/0975-6906.2015.00053.x

Cited by 4 publications

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“…A dominant gene controlled seedling resistance in B 662 to this pathotype (Mishra et al. ) and the same gene presumably provides resistance also at the adult stage. The adult plant resistance genes identified for pathotype 117‐6 should be different from those detected at the seedling stage using pathotype 40A, possibly with the exception of the dominant seedling resistance gene in B 662.…”

Section: Discussionmentioning

confidence: 99%

“…Among five durum parents, only B 662 was resistant to Pgt pathotype 117-6 at the seedling stage. A dominant gene controlled seedling resistance in B 662 to this pathotype (Mishra et al 2005) and the same gene presumably provides resistance also at the adult stage. The adult plant resistance genes identified for pathotype 117-6 should be different from those detected at (Nayar et al 2001), of which Sr7b, Sr9e and Sr11 were common (Bhardwaj 2013).…”

Section: Stem Rust Resistancementioning

confidence: 99%

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Sources of resistance to Indian pathotypes of Puccinia graminis tritici and P. triticina in durum wheat

et al. 2015

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Stem rust and leaf rust are important diseases affecting durum wheat production in India. Inheritance and extent of diversity in resistance were studied in five durum genotypes, viz. ʽB 662', ʽED 2398-A', ʽHG 110', ʽIWP 5019' and ʽLine 1172ʼ using Pgt pathotypes 40A and 117-6, and Pt pathotypes 12-2 and 104-2. F 2 and F 3 analyses showed that resistance was conferred by one or two genes in each line. In all, four genes for resistance to 40A, and eight each for pathotypes 117-6 and 12-2 were identified among the five genotypes, and three for resistance to 104-2 among B 662, ED 2398-A and IWP 5019 were indicated by tests of allelism. Although the gene identities are not known, at least some of them should be different from Sr2, Sr7b, Sr8a, Sr8b, Sr9e, Sr9g, Sr11, Sr12, Sr13, Sr14, Sr17, Sr23 and Sr28; and from Lr3, Lr14a, Lr23 and Lr27 + Lr31. These genotypes enrich the diversity of resistance to stem rust and leaf rust for durum wheat improvement.Key words: genetic diversity -Lr genes -resistance durability -Sr genes -Triticum turgidum ssp. durum India produces more than 90 million tonnes of wheat from an area of more than 25 million hectares, to which the contribution of durum wheat is about 5%. However, durum wheat has a special niche in the Indian wheat economy for at least two reasons: firstly, Indian durum is typically purchased by private traders at a premium price, mainly for processing high-value products; secondly, durum is preferred over bread wheat for several local food preparations. Durum and cultivated emmer are mainly grown in the central and southern parts, where leaf rust and stem rust are the major disease problems affecting wheat. Broadening the resistance base through the utilization of genetically diverse resistance sources is necessary to enhance the durability of resistance to meet ongoing threats from the continuously evolving rust pathogens. Relatively, little work has been done on the inheritance of rust resistance in durum, compared to bread wheat. However, studies conducted in different parts of the world indicate that durum generally shows resistance to Puccinia triticina (Pt) pathotypes virulent to bread wheat and vice versa

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Section: Discussionmentioning

confidence: 99%

Section: Stem Rust Resistancementioning

confidence: 99%

Sources of resistance to Indian pathotypes of Puccinia graminis tritici and P. triticina in durum wheat

et al. 2015

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“…Tetraploid durum wheat has historically been more resistant to leaf rust than hexaploid common wheat (T. aestivum L.) (Singh et al, 2004;Herrera-Foessel et al, 2006). However, during the last 20 years, new durum-type Pt races have emerged and caused leaf rust epidemics in several durum wheat producing regions (Singh et al, 2004;Goyeau et al, 2012;Mishra et al, 2015;Aoun et al, 2016). Virulent Pt isolates have not been found yet in North Dakota, however, a highly virulent race (BBBQJ) was reported in California and Kansas, United States (Kolmer, 2013(Kolmer, , 2015a.…”

Section: Introductionmentioning

confidence: 99%

Genome-Wide Association Studies Reveal All-Stage Rust Resistance Loci in Elite Durum Wheat Genotypes

et al. 2021

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Leaf rust, caused by Puccinia triticina (Pt), stripe rust caused by Puccinia striiformis f. sp. tritici (Pst), and stem rust caused by Puccinia graminis f. sp. tritici (Pgt) are major diseases to wheat production globally. Host resistance is the most suitable approach to manage these fungal pathogens. We investigated the phenotypic and genotypic structure of resistance to leaf rust, stem rust, and stripe rust pathogen races at the seedling stage in a collection of advanced durum wheat breeding lines and cultivars adapted to Upper Mid-West region of the United States. Phenotypic evaluation showed that the majority of the durum wheat genotypes were susceptible to Pt isolates adapted to durum wheat, whereas all the genotypes were resistant to common wheat type-Pt isolate. The majority of genotypes were resistant to stripe rust and stem rust pathogen races. The durum panel genotyped using Illumina iSelect 90 K wheat SNP assay was used for genome-wide association mapping (GWAS). The GWAS revealed 64 marker-trait associations (MTAs) representing six leaf rust resistance loci located on chromosome arms 2AS, 2AL, 5BS, 6AL, and 6BL. Two of these loci were identified at the positions of Lr52 and Lr64 genes, whereas the remaining loci are most likely novel. A total of 46 MTAs corresponding to four loci located on chromosome arms 1BS, 5BL, and 7BL were associated with stripe rust response. None of these loci correspond to designated stripe rust resistance genes. For stem rust, a total of 260 MTAs, representing 22 loci were identified on chromosome arms 1BL, 2BL, 3AL, 3BL, 4AL, 5AL, 5BL, 6AS, 6AL, 6BL, and 7BL. Four of these loci were located at the positions of known genes/alleles (Sr7b, Sr8155B1, Sr13a, and Sr13b). The discovery of known and novel rust resistance genes and their linked SNPs will help diversify rust resistance in durum wheat.

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“…It renders many of the durum wheat cultivars susceptible and follows a different lineage than 40A and 40-3 [ 25 , 26 , 27 ]. Studies on the inheritance of rust resistance in durum wheat have been limited compared to the bread wheat [ 28 ]. Host specificity has a major role for a successful infection of obligate pathogens like wheat rusts with additional intra-species host specificity of the rusts as a prominent characteristic.…”

Section: Introductionmentioning

confidence: 99%

Genome-Wide Analysis of Four Pathotypes of Wheat Rust Pathogen (Puccinia graminis) Reveals Structural Variations and Diversifying Selection

Kiran

Rawal

Dubey

et al. 2021

JoF

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Diseases caused by Puccinia graminis are some of the most devastating diseases of wheat. Extensive genomic understanding of the pathogen has proven helpful not only in understanding host- pathogen interaction but also in finding appropriate control measures. In the present study, whole-genome sequencing of four diverse P. graminis pathotypes was performed to understand the genetic variation and evolution. An average of 63.5 Gb of data per pathotype with about 100× average genomic coverage was achieved with 100-base paired-end sequencing performed with Illumina Hiseq 1000. Genome structural annotations collectively predicted 9273 functional proteins including ~583 extracellular secreted proteins. Approximately 7.4% of the genes showed similarity with the PHI database which is suggestive of their significance in pathogenesis. Genome-wide analysis demonstrated pathotype 117-6 as likely distinct and descended through a different lineage. The 3–6% more SNPs in the regulatory regions and 154 genes under positive selection with their orthologs and under negative selection in the other three pathotypes further supported pathotype 117-6 to be highly diverse in nature. The genomic information generated in the present study could serve as an important source for comparative genomic studies across the genus Puccinia and lead to better rust management in wheat.

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Diverse sources of resistance to leaf rust in durum wheat

Cited by 4 publications

References 0 publications

Sources of resistance to Indian pathotypes of Puccinia graminis tritici and P. triticina in durum wheat

Sources of resistance to Indian pathotypes of Puccinia graminis tritici and P. triticina in durum wheat

Genome-Wide Association Studies Reveal All-Stage Rust Resistance Loci in Elite Durum Wheat Genotypes

Genome-Wide Analysis of Four Pathotypes of Wheat Rust Pathogen (Puccinia graminis) Reveals Structural Variations and Diversifying Selection

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