Abstract
Abstract Measurements of carbon dioxide and ethylene evolution from ‘Victoria’ plums during the last part of the growing season showed typical climacteric respiration patterns. The amount of carbon dioxide evolved decreased from approximately 50 mg·kg-1·hour-1 in late August to a minimum of less than 5 mg·kg-1·hour-1 at the optimal harvest date, then increased sharply to approximately the level first measured. Ethylene production started at the time of the carbon dioxide minimum and increased sharply, approximately overlapping the carbon dioxide peak. Similar carbon dioxide and ethylene measurements from ‘Holmabær’ and ‘Schmidt’ sweet cherries showed a typical non-climacteric respiration pattern. The amount of carbon dioxide decreased continuously from approximately 30 mg·kg-1·hour-1 in late June to less than 4 mg·kg-1·hour-1 two weeks after the optimal harvest date. No ethylene evolution was detected during the ripening phase of the sweet cherries.
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