Reestablishing sufficient peel color in regreened Valencia oranges
AuthorIkeda, Yosuke, 1966-
AdvisorJordan, Kenneth A.
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
AbstractImprovements in the external color of Regreened 'Valencia' oranges were studied using ethylene gas. Twelve hour cycles of gassing were followed by the restoration of normal air concentrations with high humidity. Two temperatures, 14°C and 22°C were used with ethylene concentrations of 5, 10 μl/l as well as normal generated ethylene concentration in air for two weeks. The reflectance of the fruit was measured to indicate chlorophyll concentration changes. Chroma measurements were used to mimic the human eye response. The oranges treated at 22°C with either 5 or 10 μl/l ethylene gas lost their chlorophyll (greenness) and gained orange pigment (redness). Brightness increased more in the 10 μl/l ethylene than in the 5 μl/l concentrations. At 5 μl/l little evidence of stem-end decay was observed which indicates senescence was not accelerated. Some stem-end decay was observed in oranges treated with 10 μl/l of ethylene at 22°C an indication that shelf life had been reduced because of the treatments.