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Anthracnose, caused by Colletotrichum sublineolum, has been one of the most destructive diseases affecting sorghum crops in Brazil. This study aimed to characterize wild and mutant strains through morphological and cultural characteristics, conidiation, and mating-type. A high variability was observed among strains when evaluated through radial growth and type of conidia produced. Spontaneous release of sectors by some strains was also observed, confirming the high genetic instability of this pathogen. Mating type genes amplified through PCRs using the primers, SKCM1, NcHMG and HGMgram demonstrated that both idiomorphs are present in this species. All the strains analyzed were self-sterile. It was not possible to correlate the auxotrophic mutant phenotype with the morphological characteristics evaluated. A antracnose, causada por Colletotrichum sublineolum tem sido uma das mais destrutivas doenças que afetam a cultura do sorgo no Brasil. Este estudo teve como objetivo caracterizar linhagens selvagens e mutantes em relação à morfologia, produção de conídios e mating type. Uma alta variabilidade entre as linhagens foi observada em relação ao crescimento radial e produção de conídios ovais e falcados. Setores foram liberados espontaneamente por algumas linhagens, o que confirma a alta instabilidade genética deste patógeno. Genes ligados a característica mating type foram amplificados por PCRs utilizando os primers SKCM1, NcHMG e HGMgram, demonstrando que ambos os idiomorfos estão presentes nesta espécie. Todas as linhagens estudadas foram auto-estéreis. Não foi possível detectar correlação entre o fenótipo auxotrófico mutante e as características morfológicas avaliadas

Morphogenetic characterization of Colletotrichum sublineolum strains, causal agent of anthracnose of Sorghum