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The “scald-like” disorder of `Empire' apples is a CO 2 -linked disorder. In this study we investigated the factors of acclimatization of preclimacteric fruits at 3°C in air or low O 2  levels prior to elevating the CO 2  concentration. Fruits were harvested at the immature stage, which had higher potential to suffer the disorder. Establishing CA conditions of 5% CO 2  + 1.5% O 2  at 3°C within 1 day of harvest resulted in the highest incidence of the `Empire' disorder, followed by 3% CO 2  + 1.5% O 2  &gt; 5% CO 2  + 3% O 2  &gt; 3% CO 2  + 3% O 2 . The fruits had to be acclimated at 3°C for 3 to 4 weeks at 1.5% or 3% O 2  to become insensitive to 5% or 3% CO 2 . Holding the fruits in air for 1 week prior to administering 3% or 5% CO 2  was insufficient to control the disorder, whereas the fruits tolerated 3% or 5% CO 2  after holding the fruits in air for 2 weeks. But, the 2-week delay to CA resulted in accelerating flesh softening. Supplemental carbon dioxide was not necessary for at least 1 month to maintain flesh firmness at near harvest values where fruits were kept at 1.5% O 2 . Whereas at 3% O 2 , the presence of 3% or 5% CO 2  from the beginning of the storage period was required to retard flesh firmness decrease. Fruits stored for the entire storage duration without CO 2  softened markedly. In summary, we conclude that establishing CA conditions of 3% to 5% CO 2  with 1.5% or 3% O 2  at 3°C within 1 week of harvest can lead to serious incidence of the `Empire' disorder with preclimacteric fruits. Moreover, fruits acclimate better in air than at low O 2  levels with respect to tolerating CO 2 . This suggests a requirement of oxidative metabolism in acclimatization for CO 2  tolerance. Beyond 7 days, acclimatization in air at 3°C before CA is established results in excessive flesh softening, even though it does prevent the disorder incidence.

The Effect of Acclimatization of Fruits on the Control of a CO2-linked Disorder of `Empire' Apples