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Oxidative Stress Metabolism and Physiological Disorder Development in Pome Fruit

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Title: Oxidative Stress Metabolism and Physiological Disorder Development in Pome Fruit
Author: Lum, Geoffrey B.
Department: Department of Plant Agriculture
Program: Plant Agriculture
Advisor: Bozzo, Gale G.Shelp, Barry J.
Abstract: 1-Methylcyclopropene (1-MCP; ethylene antagonist) application and controlled atmosphere (CA) storage are used to delay senescence and maintain quality of pome fruit. CA conditions consist of low temperature, low O2 and elevated CO2. 1-MCP treatment of ‘Honeycrisp’ apples exacerbated CO2-induced flesh browning disorders, and this coincided with γ-aminobutyrate (GABA) accumulation and altered antioxidant status (i.e., ascorbate and glutathione). Conditioning ‘Honeycrisp’ apples at 10 °C for 5 days prior to elevated CO2 storage alleviated flesh browning, and decreased the GABA level and antioxidant response. Moreover, 1-MCP treatment and low O2 storage resulted in differential GABA production and incidence of physiological disorders (i.e., senescent scald, internal breakdown and internal cavities) in ‘AC Harrow Crisp’, ‘Harovin Sundown’ and ‘Swiss Bartlett’ pear fruit. Canonical powered partial least squares analysis confirmed that GABA production and altered antioxidant metabolism are associated with physiological disorder development in pome fruit during CA storage.
URI: http://hdl.handle.net/10214/8563
Date: 2014-11


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