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ACTIVITY OF NATURALLY DERIVED ANTIMICROBIAL PEPTIDES AGAINST FILAMENTOUS FUNGI RELEVANT FOR AGRICULTURE
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Resumo em Inglês
The search for environmentally biocompatible and cost-effective methods to control filamentous fungi in
agriculture is becoming increasingly urgent. In vitro antimicrobial activity of three synthetic peptides was
investigated against some filamentous fungi with agricultural relevance. The peptides were an analog of
Temporin called Temporizina, a fragment from Pleurocidin termed Plc-2, and a peptide identified from sesame
seeds named Pses3. Antimicrobial activity of these peptides towards filamentous fungi has not been previously
reported. Seven plant pathogenic or mycotoxigenic fungal species, isolated from plant tissues were assayed:
Alternaria solani, Colletotrichum gloesporioides, Fulvia fulvum, Fusarium oxisporum, Aspergillus niger, A.
ochraceus and Penicillium digitatum. Values of Minimum Inhibitory Concentration (MIC) and Minimum
Fungicidal Concentration (MFC) were determined and compared with the commercially available fungicide
Captan as a positive control. The peptides showing greatest inhibition were Pses3 and Plc-2 and C.
gloesporioides was the most sensitive of the evaluated fungi. The MIC values for Plc-2 and Pses3 peptides
ranged from 0.64 µM to 10.25 µM. These values were much lower than those observed for Captan, suggesting
the potential of these peptides as fungicides. In particular, Pses3 is a novel peptide derived from sesame seeds
not reported in databases.
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