Data/hora: 16/06/2024 08:23:19

Biblioteca(s): | Epagri-Sede.
Data corrente: | 24/04/2019
Data da última atualização: | 24/04/2019
Autoria: | VALE, P. A. S.; RESENDE, M. L. V.; BOTELHO, D. M. S.; POZZA, E. A.; OGOSHI, C.; MONTEIRO, A. C. A.; COSTA, B. H. G.; VASCONCELOS, V. A. M.
Título: | Temperature, incubation time and virulence of Cercospora coffeicola in the production of cercosporin.
Ano de publicação: | 2019
Fonte/Imprenta: | Journal of Phytopathology, London, v. 167, n. 5, p. 1-9, 2019.
Idioma: | Inglês

Conteúdo:

This study considers the influence of temperature, incubation time and virulence in
the production of the toxin cercosporin by Cercospora coffeicola, the causal agent of
brown eye spot in coffee. The area under the progress curve of cercosporin production
(AUPCCP) was also evaluated. A pathogenicity test was performed in a group
with 58 isolates of C. coffeicola, which allowed the selection of four isolates, two
representing the highest (LFP 12 and LFP 59) and two the lowest (LFP 24 and LFP 43)
severity groups. The four isolates were cultivated in potato dextrose agar (PDA) and
incubated in growth chambers at different temperatures (15, 20, 25 and 30°C) for
20 days. The experiments were conducted in a randomized complete block design
with four replications. The cercosporin production decreased in all tested isolates at
30°C, resulting in a lower AUPCCP. The higher values of cercosporin were obtained
at 20 and 25°C between 8 and 12 days of incubation. The isolates that produced the
highest and lowest cercosporin concentrations were LFP 12 and LFP 43, respectively.
After 15 days of incubation, toxin production is practically null in all isolates independently
of the incubation temperature. Thus, the hypothesis for quantification of cercosporin
production as a variability parameter within the species is suggested.

Palavras-Chave: | Brown eye spot; mycelial growth; toxin quantification.
Categoria do assunto: | X Pesquisa, Tecnologia e Engenharia
URL: | http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_42273.pdf
Registro original: | Epagri-Sede (Epagri-Sede)
Exemplares: | Epagri-Sede - (103393-1) - UPC - AP - DD -  -  -  - DIS