Novel sources of resistance to Septoria nodorum blotch in the Vavilov wheat collection identified by genome-wide association studies

TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik
Huyen P PhanKar-Chun Tan

Abstract

The fungus Parastagonospora nodorum causes Septoria nodorum blotch (SNB) of wheat. A genetically diverse wheat panel was used to dissect the complexity of SNB and identify novel sources of resistance. The fungus Parastagonospora nodorum is the causal agent of Septoria nodorum blotch (SNB) of wheat. The pathosystem is mediated by multiple fungal necrotrophic effector-host sensitivity gene interactions that include SnToxA-Tsn1, SnTox1-Snn1, and SnTox3-Snn3. A P. nodorum strain lacking SnToxA, SnTox1, and SnTox3 (toxa13) retained wild-type-like ability to infect some modern wheat cultivars, suggesting evidence of other effector-mediated susceptibility gene interactions or the lack of host resistance genes. To identify genomic regions harbouring such loci, we examined a panel of 295 historic wheat accessions from the N. I. Vavilov Institute of Plant Genetic Resources in Russia, which is comprised of genetically diverse landraces and breeding lines registered from 1920 to 1990. The wheat panel was subjected to effector bioassays, infection with P. nodorum wild type (SN15) and toxa13. In general, SN15 was more virulent than toxa13. Insensitivity to all three effectors contributed significantly to resistance against SN15, but not toxa...Continue Reading

References

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Citations

Oct 18, 2018·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Eric G DinglasanLee T Hickey
Jan 29, 2021·The Plant Journal : for Cell and Molecular Biology·Camilla Beate HillChengdao Li
Jun 2, 2021·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Eric G DinglasanLee T Hickey

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Methods Mentioned

BETA
genotyping

Software Mentioned

EnsemblPlant
_ Core Team
GWASpoly
missForest
GWASpoly package
R Core
JMP
R
PopGen package

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