Characterization of Pyrenophora tritici-repentis, Parastagonospora nodorum, and Parastagonospora pseudonodorum in the Tambov Oblast for the Presence of Effector Genes

Kovalenko, N. M.; Zeleneva, Yu. V.; Sudnikova, V. P.

doi:10.3103/s1068367423030114

Russ. Agricult. Sci.

2023

DOI: 10.3103/s1068367423030114

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Characterization of Pyrenophora tritici-repentis, Parastagonospora nodorum, and Parastagonospora pseudonodorum in the Tambov Oblast for the Presence of Effector Genes

N. M. Kovalenko,

Yu. V. Zeleneva,

V. P. Sudnikova

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Cited by 4 publications

References 24 publications

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Identification of effector genes of Parastagonospora nodorum, P. pseudonodorum in Tambov populations and sensitivity genes to NEs in varieties and hybrid lines of spring soft wheat

Zeleneva,

Sudnikova,

Gusev

et al. 2024

Ecological genetics

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BACKGROUND: The purpose of the work is to assess the populations of the fungi Parastagonospora nodorum and P. pseudonodorum in 2023 based on the presence of effector genes, as well as to identify alleles of Snn1/snn1, Snn3/snn3 genes that control the sensitivity or resistance of wheat to PtrTox1 and PtrTox3 toxins. MATERIALS AND METHODS: Infectious samples were collected in 2023 from spring wheat leaves. In addition, the material for the study was 2 varieties and 23 lines of spring soft wheat of local selection. Using the molecular markers Xfcp624 and Xcfd20, the presence of the Snn1 and Snn3-B1 alleles, which control sensitivity to the fungal toxins PtrTox1 and PtrTox3, was detected. RESULTS: Using molecular screening, ToxA and Tox1 genes were identified in genotypes of P. pseudonodorum isolates; Tox3 and Tox267 in P. nodorum isolates. 2 varieties of spring soft wheat and 11 hybrid lines carry a recessive allele snn1, which protects against the phytopathogen toxin PtrTox1; wheat variety Tambovchanka and 2 hybrid lines (Stb-7/15, Rl-6-22) carry the recessive allele snn3 on chromosome B1, which confers resistance to the fungal toxin PtrTox3. CONCLUSIONS: The ToxA gene was found only among monoconidial isolates of P. pseudonodorum species obtained from leaves of spring soft wheat of Lebedushka variety. As a result of molecular screening, the Tox1 gene was identified among 70 P. pseudonodorum isolates. The presence of the Tox3 and Tox267 genes was established in 30 isolates of P. nodorum species obtained from plant samples of spring durum wheat Donskaya Elegiya.The variety of Pamyati Plakhotnika and 11 hybrid lines carry one recessive allele tsn1, snn1 or snn3, protecting the plant at the genetic level from the toxins PtrToxA, PtrTox1 and PtrTox3, respectively. Variety Tambovchanka and 7 lines have protection against two toxins at once.

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Identification of effector genes of Parastagonospora nodorum, P. pseudonodorum in Tambov populations and sensitivity genes to NEs in varieties and hybrid lines of spring soft wheat

Zeleneva,

Sudnikova,

Gusev

et al. 2024

Ecological genetics

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Resistance of spring bread wheat cultivars and lines to Septoria leaf blotch, tan spot, and spot blotch pathogens

Zeleneva,

Sudnikovа,

Kovalenkо

et al. 2023

Trudy po prikladnoy botanike, genetike i selektsii

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Background. Leaf and stem diseases of cereal crops are among the most harmful in the agrocenoses of Tambov Province, significantly reducing grain yield and rapidly progressing in many regions of Russia. The aim of the study was to identify spring bread wheat lines and cultivars developed at the Middle-Russian Branch of the I.V. Michurin Federal Science Center that show resistance to leaf and stem diseases.Materials and methods. The target material was represented by 3 cultivars and 23 breeding lines of spring bread wheat. Disease resistance in seedlings was assessed in the laboratory, while for adult plants the process was carried out in the field in 2020–2022. The presence of the Tsn1 allele controlling susceptibility to the PtrToxA fungal toxin was detected using the Xfcp623 molecular marker.Results and conclusions. Accessions with high levels of resistance to Zymoseptoria tritici were identified: L-8252, L-82/60, L-8107, L-8078(23), L-43-9, L-43-1, L-4, Stb-8/15, Stb-7/15, and Stb-92. Accessions Stb-97, Stb-89, Stb-89(a), Stb-90, Stb-34, and Rl-6-22 were resistant to Parastagonospora nodorum; L-8134, L-8114, L-82/60, L-8107, Stb-10/15, Stb-9/15, Stb-8/15, Stb-7/15, Stb-97, Stb-89, Stb-89(a), Stb-90, Stb-34, and Rl-6-22 to P. pseudonodorum; L-8252, L-8107, L-43-9, L-43-1, L-4, Stb10/15, Stb-9/15, Stb-97, Stb-92, Stb-92(a), Stb-89, Stb-89(a), and Stb-34 to Pyrenophora tritici-repentis; and L-8114, L-82/60, L-43-9, L-43-1, L-4, Stb-90, Stb-34, and Rl-6-22 to Bipolaris sorokiniana. The cultivars and breeding lines showed group resistance to two, three or four pathogens. It was Lines L-8252, L-8134, L-82/60, L-8107, L-8078 (23), L-43-9, L-43-1, L-4, Stb-89, Stb-90, Stb-34, and L-33809-7-3 were observed to carry the recessive allele of the tsn1 gene.

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Molecular Identification, Effector genes and Virulence of Isolates of Parastagonospora nodorum from Altai Krai (Russia)

Zeleneva,

Gannibal,

Kazartsev

et al. 2023

Mikologiâ i fitopatologiâ

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Septoria blotches represent some of the most harmful wheat diseases that encompass all grain-producing countries worldwide. They are caused mainly by fungi of the genera Parastagonospora and Zymoseptoria. The aims of the research were to analyze the nucleotide sequences of two phylogenetically informative DNA loci, ITS and tub2, of Parastagonospora nodorum isolates from the Altai Krai, to detect the presence of Tox1, Tox3, ToxA effector genes and to study the virulence of the isolates. Microscopic analysis of fragments of affected plant tissue was used for primary identification of the Septoria blotch. The causative agent from the studied plant samples was identified as P. nodorum. Fungal colonies cultivated on potato-glucose agar displayed a well-developed light brown velvety mycelium with dark periphery (mixed type) and numerous pycnidia exhibiting high sporulation capacity. Microbiological diagnostics were complemented by molecular genetic studies. Sequencing of ITS and tub2 loci isolates revealed complete genetic identity of all eight studied monoconidial isolates obtained from different samples. PCR-based detection of tree Tox-genes demonstrated that the only Tox3 was present in the geno-types of 80 tested P. nodorum monoconidial isolates. The ToxA and Tox1 genes were not found in the studied isolates. The virulence of P. nodorum isolates was evaluated in laboratory conditions using an isolated wheat leaves assay. Mixture of four isolates from spring wheat and one isolate from winter wheat, were characterized as virulent. When spring and winter wheat cultivars were infected with two isolates obtained from oats, pathogenic but avirulent properties were detected. The isolate from triticale was avirulent to winter wheat cultivars and virulent to spring wheat cultivars.

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Characterization of Pyrenophora tritici-repentis, Parastagonospora nodorum, and Parastagonospora pseudonodorum in the Tambov Oblast for the Presence of Effector Genes

Cited by 4 publications

References 24 publications

Identification of effector genes of <i>Parastagonospora nodorum</i>, <i>P. pseudonodorum</i> in Tambov populations and sensitivity genes to NEs in varieties and hybrid lines of spring soft wheat

Identification of effector genes of <i>Parastagonospora nodorum</i>, <i>P. pseudonodorum</i> in Tambov populations and sensitivity genes to NEs in varieties and hybrid lines of spring soft wheat

Resistance of spring bread wheat cultivars and lines to Septoria leaf blotch, tan spot, and spot blotch pathogens

Molecular Identification, Effector genes and Virulence of Isolates of <i>Parastagonospora nodorum</i> from Altai Krai (Russia)

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