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Summa Phytopathologica

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

Resumo

MARINHO, Glaucio Juan Passos; KLEIN, Denise Espellet  e  CESAR LUIS JUNIOR, Siqueira. Evaluation of soapberry (Sapindus saponaria L.) leaf extract against papaya anthracnose. Summa phytopathol. [online]. 2018, vol.44, n.2, pp.127-131. ISSN 0100-5405.  https://doi.org/10.1590/0100-5405/175605.

Chemical fungicides provide the primary means to control fungal infection in fruits and vegetables in the postharvest. Exploitation of natural products to control decay and prolong the storage life of perishables has received more attention. In this study, hydroethanolic extracts from the leaves of soapberry (Sapindus saponaria L.) were investigated for their inhibitory activity against the fungus Colletotrichum gloeosporioides, the causal agent of anthracnose in papaya fruits. To evaluate the antifungal activity of the plant extract, the latter was incorporated into potato-dextrose-agar (PDA) medium at different concentrations (10, 50 and 100 mg mL-1), and mycelial growth inhibition, spore production inhibition and morphological changes were evaluated at room temperature after 7 days. Efficacy of the extract was noted when it was used at 50 mg mL-1 and 100 mg mL-1, resulting in a reduction in the mycelial growth (P< 0.05). At 50 mg mL-1, the extract causes morphological changes by reducing the size of hyphae, which become shorter and more branched. At 100 mg mL-1 extract, damages in the hyphal structure were more severe, causing mycelial rupture. In vivo treatment with 100 mg mL-1 extract prevented the development of anthracnose symptoms in fresh papaya fruits. Soapberry leaf extract has strong inhibitory activity against C. gloeosporioides, preventing the mycelial growth and reducing the appearance of anthracnose symptoms. Taken together, these results demonstrated the potential of this extract as a natural fungicide, constituting an alternative measure for disease control in papaya fruits.

Palavras-chave : postharvest; plant extract; Colletotrichum gloeosporioides.

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