Establishment and sanity of wheat seedlings produced from  seeds infected with Pyricularia oryzae Triticum

João Leodato Nunes Maciel; Alieze Nascimento da Silva; Ivan Francisco Dressler da Costa; Marcos Kovaleski; Daniela da Silva; Carolina Cardoso Deuner

doi:10.1590/SciELOPreprints.5490

##article.authors##

João Leodato Nunes Maciel Brazilian Agricultural Research Corporation https://orcid.org/0000-0002-1827-1381
Alieze Nascimento da Silva Universidade Federal de Santa Maria https://orcid.org/0000-0003-3253-0885
Ivan Francisco Dressler da Costa Universidade Federal de Santa Maria https://orcid.org/0000-0002-9755-0185
Marcos Kovaleski Brazilian Agricultural Research Corporation https://orcid.org/0000-0002-4839-0904
Daniela da Silva Universidade de Passo Fundo https://orcid.org/0000-0001-5884-3455
Carolina Cardoso Deuner Universidade de Passo Fundo https://orcid.org/0000-0001-6010-1610

DOI:

https://doi.org/10.1590/SciELOPreprints.5490

Keywords:

Wheat blast, Inoculum source, Seedling death, Transmissibility of symptoms

Abstract

Pyricularia oryzae Triticum (PoT) is known to survive in wheat seeds and this condition favors its spread. There are, however, many gaps in knowledge regarding the damage caused by this pathogen in relation to the establishment and sanity of wheat seedlings. The objective of this study was to determine whether there is a correlation between incidence of PoT in wheat seeds and variables associated with the establishment and the sanity of the produced seedlings. Seven samples of wheat seeds naturally infected with the pathogen were used. The incidence of PoT in each of the seed samples was determined via the Blotter test, indicating a variation from 0 to 80.5%. The seeds of each sample were sown in 500 mL plastic pots containing autoclaved sand and the seedlings produced were evaluated in relation to the following aspects; emergency, height, lesions in different segments, mortality, abnormalities and transmissibility of symptoms. The study demonstrated that there is a correlation between incidence of PoT in wheat seeds and the following variables related to the seedlings produced; height at 7 days after sowing (DAS), incidence and severity of symptoms at 7, 14 and 21 DAS, and mortality at 14 and 21 DAS. The results confirmed that the establishment and sanity of wheat seedlings directly depend on incidence of PoT in the seeds.