Thesis
POSTHARVEST SYSTEMS FOR ORGANIC 'HONEYCRISP' AND 'FUJI' APPLES
Washington State University
Master of Science (MS), Washington State University
01/2022
DOI:
https://doi.org/10.7273/000004473
Handle:
https://hdl.handle.net/2376/124667
Abstract
Dynamic controlled atmosphere (DCA) and low-pressure (LP) storage can be used as an alternative to store organic apples for extended periods of time. DCA uses low oxygen (O2) levels and monitors the anaerobic compensation point (ACP). LP ventilates air at less than atmospheric pressure. ‘Honeycrisp’ and ‘Fuji’ apples from 4 different orchard locations were picked at commercial harvest maturity and placed into controlled atmosphere (CA) and LP storage regimes. Initial ACP was monitored using chlorophyll fluorescence (CF), respiratory quotient (RQ), and ethanol content. Final CA conditions for ‘Honeycrisp’ were: CA and CA-RQ (3kPa O2/0.5 kPa CO2), and CA-ILOS (Initial low oxygen stress; 0.5kPa O2/0.5kPa CO2 -10 days, 1.0kPa O2/0.7MPa CO2 thereafter). Final CA conditions for ‘Fuji’ were CA and CA-RQ (0.8kPa O2/0.8 kPa CO2), but CA-ILOS (Initial low oxygen stress; 0.6kPa O2/0.8kPa CO2 -10 days, 0.8kPa O2/0.8kPa CO2 thereafter). Two LP storage temperatures (LP33-1°C/ LP37-3°C) were used in the first season, but only (LP33-1°C) in the second. Fruit were preconditioned in air prior to final storage. Fruit quality (fruit weight, flesh firmness, soluble solids content (SSC), titratable acidity (TA), internal ethylene concentration, and respiration rate) and physiological disorders incidence were assessed after 6 and 9 months of storage plus 4 weeks in air (3°C) plus 7 days at room temperature (20°C). The performance in storage was affected by cultivar, environment, and maturity at harvest. There was variation among seasons. The incidence of physiological disorders varied between cultivars and locations. C21 developed 19.4% of soggy breakdown and W40 developed 17.2% of internal browning in the first season. The effect of storage system on physiological disorders was depended on the effect of orchard location. The incidence of physiological disorders increased as the fruit were transferred to air and RT. LP storage reduced the incidence of physiological disorders after 9 months. LP33 developed slightly more soft scald than CA storage (2.9% and 0.4%) in the second season. LP33 maintained higher TA of ‘Fuji’ (0.28%) in the first season, and of ‘Honeycrisp’ (0.34%) in the second.
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Details
- Title
- POSTHARVEST SYSTEMS FOR ORGANIC 'HONEYCRISP' AND 'FUJI' APPLES
- Creators
- Marcella Galeni Soares Rafael
- Contributors
- Carolina Torres (Advisor)James Mattheis (Committee Member)Ines Hanrahan (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Horticulture, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University
- Number of pages
- 147
- Identifiers
- 99900882027601842
- Language
- English
- Resource Type
- Thesis