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Resistance stability to Septoria tritici blotch and comparison of screening methods for ranking STB disease

  • Nana VagndorfEmail author
  • Annemarie Fejer Justesen
  • Jeppe Reitan Andersen
  • Ahmed Jahoor
  • Susanne Sindberg
  • Lise Nistrup Jørgensen
Original Article
  • 13 Downloads

Abstract

Septoria tritici blotch (STB), caused by the ascomycete fungus Zymoseptoria tritici (formerly known as Mycosphaerella graminicola), is a devastating foliar disease causing major yield losses in wheat each year particularly in North-western Europe. Based on varieties ranked for susceptibility to STB in national trials, it was revealed that Danish Z. tritici populations are very dynamic, both over time and geographical distance. The STB ranking of varieties varied significantly between locations and years indicating differences in virulence between local populations. Comparison of results from seedling tests and field trials reveals that these two types of screenings can be used in combination, since a high correlation was observed in variety rankings for STB susceptibility. Inoculation experiments with seedlings show significant differences in the virulence of pathogen populations originating from different locations within Denmark. Significant changes over time were observed in the variety, Mariboss. An increased susceptibility in this variety followed an intensive cropping period, hence supporting a boom and bust scenario. In conclusion, results from this study indicate the importance of cultivating a diverse set of varieties in order to avoid the boom and bust scenario. Furthermore, varieties should be tested for resistance in several locations in order to ensure an effective and durable resistance.

Keywords

Septoria tritici blotch Disease resistance Resistance stability Disease assessment methods Winter wheat 

Notes

Acknowledgements

The project is funded by the Danish Research Council and the Pajbjerg Foundation. We thank Kirsten Jensen from Aarhus University for proofreading, laboratory technician Hanne Svenstrup from Nordic Seed and laboratory technicians Birgitte Boyer Frederiksen and Hanne-Birgitte Christiansen from Aarhus University, Flakkebjerg for assisting in laboratory work. Furthermore, we thank Vahid Edriss for assistance in statistical analysis.

Funding

This study was funded by Pajbjerg Foundation and Danish Agency for Science and Education.

Compliance with ethical standards

Conflict of interest

The authors declare that there are no conflicts of interest.

Ethical statement

We declare that all ethical responsibilities have been met during this study and the rules of good scientific practice have been followed. This study was done as cooperation. The authors are employees at the breeding company Nordic Seed A/S, Tystofte and Aarhus University. The authors declare that there are no conflicts of interests. The work was funded by the Danish Research Council and Pajbjerg Foundation.

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Copyright information

© Deutsche Phytomedizinische Gesellschaft 2019

Authors and Affiliations

  • Nana Vagndorf
    • 1
    Email author
  • Annemarie Fejer Justesen
    • 2
  • Jeppe Reitan Andersen
    • 1
  • Ahmed Jahoor
    • 1
  • Susanne Sindberg
    • 3
  • Lise Nistrup Jørgensen
    • 2
  1. 1.Nordic Seed A/SOdderDenmark
  2. 2.Department of Agroecology, Flakkebjerg Research CentreAarhus UniversitySlagelseDenmark
  3. 3.TystoftefondenSkælskørDenmark

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