Fermentative metabolism and organic acid concentrations in fruit of selected strawberry cultivars with different tolerances to carbon dioxide

摘要

Effects of 20 kPa CO2 treatments on concentrations of fermentation products, organic acids, and activities of pyruvate decarboxylase (PDC) and alcohol dehydrogenase (ADH), were measured in fruits of selected strawberry cultivars (Annapolis, Cavendish, Honeoye, Kent, Jewell, Lateglow and NorthEast). Acetaldehyde, ethanol, and ethyl acetate concentrations increased in CO2-treated fruits of Honeoye and Kent, but not in Cavendish or Annapolis. The former two cultivars were classified as intolerant of high CO2 and the latter two as tolerant of high CO2. Activities of PDC and ADH were higher in CO2-treated than in air-treated fruits of the tolerant cultivars but not in the intolerant cultivars. Succinate accumulated in fruits of all cultivars, but concentrations were higher in the tolerant than in the intolerant cultivars. Results are discussed in relation to tolerance of fruits to CO2.