Novel insights into the early stages of infection by oval conidia of Colletotrichum sublineolum

  • Ednéia Aparecida de Souza-Paccola State University of Londrina; Dept. of Agronomy; Universidade Estadual de Londrina
  • Cleide Aparecida Bomfeti State University of Londrina; Dept. of General Biology; Universidade Estadual de Londrina
  • Francisco André Ossamu Tanaka University of São Paulo; ESALQ; Dept. of Plant Pathology and Nematology; Universidade de São Paulo
  • Nelson Sidnei Massola Junior University of São Paulo; ESALQ; Dept. of Plant Pathology and Nematology; Universidade de São Paulo
  • Nelson Barros Colauto Paranaense University; Lab. of Molecular Biology; Paranaense University
  • José Edson Fontes Figueiredo Embrapa Maize & Sorghum; Molecular Biochemistry Lab; Embrapa
  • Luzia Doretto Paccola-Meirelles State University of Londrina; Dept. of Agronomy; Universidade Estadual de Londrina

Abstract

Anthracnose, caused by Colletotrichum sublineolum Henn. ex Sacc. & Trotter, is one of the most important sorghum [Sorghum bicolor (L.) Moench] diseases in Brazil. This fungus exhibits conidial dimorphism, producing either falcate or oval conidia on solid and liquid media, respectively. We compared patterns of the initial infection events by these two types of conidia on sorghum leaves using light microscopy and scanning electron microscopy. The infection events during the first 24 h were similar for both oval and falcate conidia. Globose and melanized apressoria were formed at 24 h after inoculation (hai) regardless of the conidia type. Dense mycelium and oval conidia developed from germinated falcate conidia at 32 hai. Hyphal mass displaying acervuli filled with falcate conidia and surrounded by setae, developed from germinated oval conidia at 48 hai. Oval conidia were as capable as falcate conidia of infecting sorghum leaves. The inherent ability to grow faster and the easeness with which oval conidia can be produced in vitro as compared to falcate, make the former a preferred choice for studies on the C. sublineolum-sorghum interaction. It would be instructive to further investigate the potential role of the oval conidia in epidemics.

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Published
2015-08-01
How to Cite
Souza-Paccola, E., Bomfeti, C., Tanaka, F., Massola Junior, N., Colauto, N., Figueiredo, J., & Paccola-Meirelles, L. (2015). Novel insights into the early stages of infection by oval conidia of Colletotrichum sublineolum . Scientia Agricola, 72(4), 351-355. https://doi.org/10.1590/0103-9016-2014-0409
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