IDENTIFICATION OF EFFECTOR GENES OF P. nodorum, P. pseudonodorum IN TAMBOV POPULATIONS AND SENSITIVITY GENES TO NEs IN VARIETIES AND BREEDING LINES OF SPRING SOFT WHEAT



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Abstract

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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About the authors

Yulia Zeleneva

All-Russian Institute of Plant Protection

Author for correspondence.
Email: zelenewa@mail.ru
ORCID iD: 0000-0001-9716-288X

Doctor of Biological Sciences, Associate Professor, Senior Researcher at the Laboratory of Mycology and Phytopathology

Russian Federation

Valentina P. Sudnikova

Email: sudnikova47@mail.ru
ORCID iD: 0000-0001-5367-1340

кандидат сельскохозяйственных наук

Ivan V. Gusev

Email: tmbsnifs@mail.ru
ORCID iD: 0000-0003-1063-4739
Russian Federation

Olga A. Baranova

Email: baranova_oa@mail.ru
ORCID iD: 0000-0001-9439-2102

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