Mango fruit (cv. Seddik) is known as a delicate fruit for storage after harvest. Herein, carboxymethyl cellulose (CMC) and guar gum-based silver nanoparticles (AgNPs) were used as fruit coatings, and their effects on postharvest storage behavior and quality attributes were investigated. AgNPs were synthesized using a chemical reduction approach and then combined with CMC and guar gum as coating bases. Mango fruits were coated with the developed and pre-characterized CMC-AgNPs and guar gum-AgNPs, and then packed and stored at 13 °C for 4 weeks. The results showed an increase in weight loss, respiration rate, total soluble solids (TSS), total sugars, and total carotenoids over the storage period. However, this increase was comparatively less significant in coated fruits compared to uncoated fruits. Firmness and titratable acidity (TA) significantly decreased during storage, but this decrease was less in coated fruits. Silver traces in fruit pulp samples were not detected. These findings showed the efficacy of CMC-AgNP and guar gum-AgNP coatings in delaying mango fruit ripening and maintaining fruit quality during cold storage. Therefore, these coatings could be promising alternative materials for extending the postharvest life and marketing period of mango fruit.

Olive trees are commercially propagated by cuttings or grafting on clonal or seedling rootstocks; recently, olive micropropagation has emerged as a powerful technique for mass production of true to type and pathogen free plants. The current study was carried out to evaluate the effect of silver, chitosan and selenium nanoparticles as microbial decontamination agents, as well as evaluate its possible effects on in vitro shoot growth and multiplication of three olive cultivars namely Koroneiki, Picual and Manzanillo. Validation and characterization of the biosynthesized nanoparticles was carried out by Transmission Electron Microscopy. The produced nanoparticles were added to the olive culture medium, and the growth parameters were determined. The tested nanoparticles showed varied degree of antimicrobial activity, silver nanoparticles were highly effective to inhibit in vitro microbial contamination. The effect of genotypes on shoot growth and multiplication was significant; Koroneiki and Picual cultivars showed better growth measurements compared with Manzanillo. The addition of nanoparticles to the culture medium had a significant outcome on growth and multiplication rate of in vitro growing olive shoots. Silver nanoparticles produced higher values of number of shoots, shoots length, leaf number and multiplication rate compared with the other treatments. In conclusion; the current results showed that nanoparticles were efficient as in vitro disinfectant agent and the nanoparticles addition to culture medium especially silver NPs had a positive effect on growth and multiplication rate of in vitro growing olive shoots.

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