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Summa Phytopathologica

versão impressa ISSN 0100-5405versão On-line ISSN 1980-5454

Resumo

ARMESTO, Cecilia; MAIA, Fernanda Gonçalves Martins; MONTEIRO, Fernando Pereira  e  ABREU, Mário Sobral de. exoenzymes as a pathogenicity factor for Colletotrichum gloeosporioides associated with coffee plants. Summa phytopathol. [online]. 2019, vol.45, n.4, pp.368-373.  Epub 17-Jan-2020. ISSN 0100-5405.  https://doi.org/10.1590/0100-5405/191071.

Phytopathogenic fungi during the penetration and colonization process are capable of secreting several enzymes, which enable infection of the host live tissue, acting on the degradation of wax, cuticle and cell walls. The ability of a pathogenic agent to produce enzymes or not can determine the severity degree of a disease. In this study, 33 isolates of Colletotrichum gloeosporioides related to anthracnose and blister spot on coffee trees were evaluated for their ability to produce hydrolytic enzymes (amylase, lipase, protease, laccase, pectinase and cellulase) and specific cell wall degrading enzymes “CWDEs” (polygalacturonase, polymethylgalacturonase and pectin-lyase), as well as their relationship with the pathogenicity/aggressiveness of isolates. For all isolates of C. gloeosporioides, extracellular enzymes could be detected, except cellulases. Isolates I-9 and I-24 produced the highest levels of extracellular enzymes, as well as CWDEs. They also had the highest disease intensity indexes, suggesting a relationship between enzymes and aggressiveness of the isolates.

Palavras-chave : hydrolytic enzymes; cell wall; aggressiveness.

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