Journal
AGRICULTURE-BASEL
Volume 11, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/agriculture11060491
Keywords
chlorophyll; fluorescence; storage atmosphere; superficial scald
Categories
Funding
- Agricultural Research Council of South Africa
- Postharvest Innovation Programme (PHI)
- Hortgro Science
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The study found that using repeated low oxygen stress and dynamic controlled atmosphere technologies can effectively inhibit superficial scald development on apples during long-term storage, while also maintaining higher flesh firmness and total soluble solids in the fruit. The combination of RLOS phases with controlled atmosphere or ultra-low oxygen storage, as well as DCA-CF treatment, reduced the development of superficial scald possibly by suppressing the oxidation of volatiles related to scald development.
The efficacy of dynamic controlled atmosphere technologies; repeated low oxygen stress (RLOS) and dynamic controlled atmosphere-chlorophyll fluorescence (DCA-CF) to control superficial scald development on 'Granny Smith' apples during long-term storage was studied. Fruit were stored for 2, 4, 6, 8, and 10 months at 0 degrees C in DCA-CF (0.6% O-2 and 0.8% CO2), regular atmosphere (RA)(approximate to 21% O-2 and 90-95% RH), and RLOS treatments: (1) 0.5% O-2 for 10 d followed by ultra-low oxygen (ULO) (0.9% O-2 and 0.8% CO2) for 21 d and 0.5% O-2 for 7 d or (2) 0.5% O-2 for 10 d followed by controlled atmosphere (CA) (1.5% O-2 and 1% CO2) for 21 d and 0.5% O-2 for 7 d. Development of superficial scald was inhibited for up to 10 months and 7 d shelf life (20 degrees C) under RLOS + ULO and DCA-CF treatments. Apples stored in RLOS + ULO, RLOS + CA, and DCA-CF had significantly (p < 0.05) higher flesh firmness and total soluble solids. The RLOS phases applied with CA or ULO and DCA-CF storage reduced the development of superficial scald by possibly suppressing the oxidation of volatiles implicated in superficial scald development.
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