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

Scientia Agricola

Ednéia Aparecida De Souza-paccola¹  Cleide Aparecida Bomfeti¹  Francisco André Ossamu Tanaka¹  Nelson Sidnei Massola Junior¹  Nelson Barros Colauto¹  José Edson Fontes Figueiredo¹  Luzia Doretto Paccola-meirelles¹ 

关键词: Sorghum bicolor;    anthracnose;    conidial dimorphism;    infection biology;    secondary sporulation;   

DOI  :  10.1590/0103-9016-2014-0409

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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