European Journal of Plant Pathology

, Volume 150, Issue 1, pp 49–56 | Cite as

Silicon suppresses tan spot development on wheat infected by Pyrenophora tritici-repentis

  • Paulo Cesar Pazdiora
  • Keilor da Rosa Dorneles
  • Carlos Alberto Forcelini
  • Emerson Medeiros Del Ponte
  • Leandro José DallagnolEmail author


Tan spot caused by Pyrenophora tritici-repentis is the main foliar diseases of wheat in Brazil. The effect of silicon (Si) on the components of resistance of a susceptible (Fundacep Horizonte) and a moderately resistant (Quartzo) wheat cultivar was studied in a controlled environment. Silicon was supplied as calcium silicate in the soil 30 days before sowing. At the booting stage, a conidial suspension of the fungus was sprayed onto the flag leaves of potted plants, which were incubated under moist conditions for 48 h. Afterwards, inoculated leaves were assessed for: incubation period (IP), infection efficiency (IE), area under lesion size curve (AULSC), lesion size (LS), severity (SEV) and area under severity curve (AUSC). Foliar Si concentrations were quantified at the end of the evaluations. Si supply to plants increased leaf Si concentration in 233% for Fundacep Horizonte (from 4.8 to 16.0 g kg−1 of dry matter) and 211% for Quartzo (from 5.3 to 16.5 g kg−1 of dry matter). In the Si + treatments, IP was longer by 24 and 17 h, IE declined by 53.5 and 65.5%, LS (at 264 h after inoculation) by 4.6 mm (from 9.5 to 4.9 mm) and 5.9 mm (from 8.2 to 2.3 mm), and SEV by 53% (from 54.4 to 18.8%) and 88% (from 47.7 to 5.5%) respectively, for the Fundacep Horizonte and Quartzo cultivars. The Si x cultivar interaction was not significant for AULSC and AUSC, and these variables were reduced by 55.8 and 80.8%, respectively, in plants supplied with Si. In conclusion, Si enhanced the resistance of wheat plants to tan spot development by affecting several resistance components, regardless of the resistance level of the cultivar. However, the greatest reduction in tan spot development by Si supply was observed when using a moderately resistant cultivar.


Dreshslera tritici-repentis Triticum aestivum Calcium silicate Epidemiology Tan spot 



P. C. Pazdiora and K. R. Dorneles received scholarships from Coordenação de Aperfeiçoamento de Pessoal de Ensino Superior (CAPES). L. J. Dallagnol and E. M. Del Ponte are supported by fellowships from Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). This research was supported by a grant from CNPq (476852/2012-9).

Compliance with ethical standards

Conflict of interest

There is no conflict of interest.


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Copyright information

© Koninklijke Nederlandse Planteziektenkundige Vereniging 2017

Authors and Affiliations

  • Paulo Cesar Pazdiora
    • 1
  • Keilor da Rosa Dorneles
    • 1
  • Carlos Alberto Forcelini
    • 2
  • Emerson Medeiros Del Ponte
    • 3
  • Leandro José Dallagnol
    • 1
    Email author
  1. 1.Faculdade de Agronomia Eliseu MacielUniversidade Federal de PelotasPelotasBrazil
  2. 2.Faculdade de Agronomia e Medicina VeterináriaUniversidade de Passo FundoPasso FundoBrazil
  3. 3.Departamento de FitopatologiaUniversidade Federal de ViçosaViçosaBrazil

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