ISHS Acta Horticulturae 768: XXVII International Horticultural Congress - IHC2006: International Symposium on The Role of Postharvest Technology in the Globalisation of Horticulture
POSTHARVEST APPLICATION OF HOT WATER, FUNGICIDE AND WAXING ON THE SHELF LIFE OF VALENCIA AND THE LOCAL ORANGE CV. SIAVARZ |
| Authors: | N.A. Ansari, H. Feridoon |
| Keywords: | sweet orange, TBZ, vitamin C, total soluble solids, titratable acidity |
| Abstract:
Sweet orange is an important horticultural fruit in Iran. Postharvest losses of sweet orange may reach more than 30%. In an attempt to develop a system for reducing postharvest losses, this experiment was conducted on two orange cultivars, ‘Valencia’ and a local selection ‘Siavarz’ (Citrus sinensis L. Osbeck), grown under subtropical climatic conditions in Khuzestan, Iran. Each cultivar was harvested at optimal maturity and then divided into 2 groups for different postharvest treatments. Treatments included heat treatment (hot water dip 52°C for 3 min and water 25°C for 3 min), thiabendazol (TBZ) fungicide (2 g/L), without fungicide, wax, and a combination of these treatments. Consequently, all fruit samples were stored at 6±1°C and 85-90% humidity (RH) for 3 months. Using hot water, wax and TBZ fungicide treatments minimized postharvest decay especially Penicillium molds. On ‘Siavarz’ these treatments reduced decay to 2% as compared to the control treatment with 26.7%. Application of wax significantly inhibited loss of fruit weight, ascorbic acid and fruit firmness. Hot water treatment inhibited fruit weight and firmness loss, resulted in a decrease in ascorbic acid content. During cold storage, titratable acidity (TA %) and ascorbic acid content decreased, while total soluble solids (TSS) content and the ratio TSS/TA increased. | |
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