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Provedor de dados:  Repositório Alice
País:  Brazil
Título:  Mycoparasitic nature of Bionectria sp. strain 6.21.
Autores:  MELO, I. S. de
VALENTE, A. M. M. P.
KAVAMURA, V. N.
VILELA, E. S. D.
FAULL, J. L.
Data:  2015-12-07
Ano:  2014
Palavras-chave:  Atividade antifúngica
Antifungal activity
Bionectria sp
Enzymes
Plant diseases
Fungo
Fungo para controle biológico
Controle biológico
Rhizoctonia solani
Pythium aphanidermatum
Doença de planta
Fungi
Plant diseases and disorders
Biological control agents
Antifungal properties
Mycoparasits
Resumo:  Abstract: In this study, a Bionectria sp. strain isolated from citrus rhizosphere was evaluated for its potential in inhibiting the growth of Rhizoctonia solani and Pythium aphanidermatum. It was demonstrated that Bionectria sp. 6.21 inhibited the growth of P. aphanidermatum and R. solani. In dual cultures, however, the antagonist only parasitised R. solani. Regarding the assay involving P. aphanidermatum, a lack of mycoparasitic ability was demonstrated. Crude extract of Bionectria completely inhibited the mycelial growth of both fungi. It appears that the main mechanism involved in the antagonism of Pythium by Bionectria is through antibiotic production. The antagonistic fungus released extracellular secondary metabolites. The metabolites were found to be inhibitory to both plant pathogenic fungi. From the crude extract, eleven fractions were obtained and tested for their antifungal properties. Two of them showed very strong activity against P. aphanidermatum. The obtained results indicated that this biocontrol agent has both antibiotic and mycoparasitic properties. On the other hand, evidence obtained from Scanning Electron Microscopy (SEM) suggests the involvement of an enzymatic process, with enzymatic digestion playing a major role in the parasitism of Bionectria sp. 6.21. In conclusion, these results provide evidence that mainly due to mycoparasitism, this strain has the potential to become a good candidate for biological control.

2014
Tipo:  Artigo em periódico indexado (ALICE)
Idioma:  Inglês
Identificador:  14667

http://www.alice.cnptia.embrapa.br/handle/doc/1030877

http://ainfo.cnptia.embrapa.br/digital/bitstream/item/135039/1/2015AP07.pdf
Editor:  Journal of Plant Protection Research, Varsóvia, v. 54, n. 4, p. 327-333, 2014.
Relação:  Embrapa Meio Ambiente - Artigo em periódico indexado (ALICE)
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