Carbon Dioxide Exchange of Developing Apple (Malus pumila Mill.) Fruits

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Abstract
The carbon dioxide exchange of developing apple fruits was monitored during development. The results of measurements on detached fruits in the laboratory were consistent with those made on attached fruit in the field. Respiration rate at 20 °C in the dark declined from 120 ng CO2 g−1 fr. wt. s−1 on 5 June (4 weeks after full bloom) to less than 3 ng g−1 fr. wt. s−1 by late September. In the light, net CO2 evolution was much decreased, but on no occasion did photosynthesis exceed respiration and no net CO2 uptake was detected. The Q10 for dark respiration over the interval from 15 to 25 °C changed from 2.8 in early June to 1.6 in early August