Biological control of postharvest fungal pathogens of sweet oranges by Plumeria latex

Plant extracts could be useful in the management of fungal decay in postharvest conditions. This study investigated the phytochemical profile and effects of Plumeria latex against the postharvest fungal pathogens of sweet oranges (Citrus sinensis L Osbeck). Polar and non polar solvent extractions revealed alkaloids, glycosides and terpenoids as the major phytoconstituents present in Plumeria latex. Postharvest fungal pathogens of oranges such as Aspergillus niger, A. fumigatus, A. terreus, Penicillium digitatum and Rhizopus arrhizus were tested against various extracts of Plumeria latex. Antifungal assay of the extracts recorded significant inhibitory activity against Aspergillus terreus and Penicillium digitatum by the petroleum ether extract. Being the most effective on all species, Plumeria obtusa was found to have potential antifungal properties followed by P. rubra after five days of incubation. Based on these results, application of Plumeria latex can be considered a useful strategy to be included in an integrated approach for controlling postharvest fungal disease of oranges.

Author(s): Sibi G, Apsara V, Dhananjaya K, Mallesha H and Ravikumar KR

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