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dc.contributor.advisorJordan, Kenneth A.en_US
dc.contributor.authorIkeda, Yosuke, 1966-
dc.creatorIkeda, Yosuke, 1966-en_US
dc.date.accessioned2013-04-03T13:16:52Z
dc.date.available2013-04-03T13:16:52Z
dc.date.issued1992en_US
dc.identifier.urihttp://hdl.handle.net/10150/278218
dc.description.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.
dc.language.isoen_USen_US
dc.publisherThe University of Arizona.en_US
dc.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.en_US
dc.subjectEngineering, Agricultural.en_US
dc.subjectBiology, Plant Physiology.en_US
dc.titleReestablishing sufficient peel color in regreened Valencia orangesen_US
dc.typetexten_US
dc.typeThesis-Reproduction (electronic)en_US
thesis.degree.grantorUniversity of Arizonaen_US
thesis.degree.levelmastersen_US
dc.identifier.proquest1350789en_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.nameM.S.en_US
dc.identifier.bibrecord.b25469769en_US
refterms.dateFOA2018-07-18T02:10:43Z
html.description.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.


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