ORIGINAL ARTICLE
Mycoparasitic nature of Bionectria sp. strain 6.21
1
Laboratory of Environmental Microbiology, Embrapa Environment, Jaguariúna, SP 13.820-000, Brazil
2
Department of Biological Sciences, Birkbeck College, University of London, Malet Street, London, WC1E 7HX, UK
Submission date: 2014-03-13
Acceptance date: 2014-10-19
Corresponding author
Vanessa Nessner Kavamura
Laboratory of Environmental Microbiology, Embrapa Environment, Jaguariúna, SP 13.820-000, Brazil
Laboratory of Environmental Microbiology, Embrapa Environment, Jaguariúna, SP 13.820-000, Brazil
Journal of Plant Protection Research 2014;54(4):327-333
KEYWORDS
TOPICS
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.
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
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