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Istituto Agronomico Mediterraneo di Bari (IAMB) - Centre international de hautes études agronomiques méditerranéennes (CIHEAM) 2020

Survey of postharvest of fungal contamination and characterization of mycotoxigenic fungi of table grapes in Lebanon

Khalil, Jack

Titre : Survey of postharvest of fungal contamination and characterization of mycotoxigenic fungi of table grapes in Lebanon

Auteur : Khalil, Jack

Etablissement de soutenance : Istituto Agronomico Mediterraneo di Bari (IAMB) - Centre international de hautes études agronomiques méditerranéennes (CIHEAM)

Grade : Master of Science : Integrated pest management of Mediterranean fruit crops (2020)

Résumé
Table grapes are exposed to fungal infections both before and after harvest, in particular, the genera Aspergillus, Penicillium, and Alternaria can cause decays and contaminations by mycotoxins. In this study, the main fungi affecting Lebanese table grapes after harvest were assessed in terms of epiphytic populations, latent infections and rot incidence. Furthermore, the effect of storage with/without SO2 generating pads was evaluated. Representative isolates were molecularly identified and their toxigenic potential was established, with particular reference to regulated mycotoxins as OTA and patulin. The epiphytic population was found to harbour mainly wound pathogens (Aspergillus spp. and Penicillium spp.), whereas latent infections and rots were mostly caused by Botrytis spp.. SO2 generating pads caused a significant reduction of the epiphytic population and rots, whereas they were less effective against latent infections . The characterization of Aspergillus, Penicillium and Alternaria isolates showed that A. tubingensis, P. glabrum and A. alternata were the most represented species, respectively. Interestingly, strains of A. welwitschiae and P. expansum were also found, and produced OTA and patulin, respectively. These data evidenced the need of effective measures to prevent postharvest losses caused by toxigenic fungi in terms of quality and safety issues.

Présentation (IAMB Library)

Page publiée le 2 mai 2021