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Ethylene production and fruit-softening rates in several apple fruit ripening variants


, : Ethylene production and fruit-softening rates in several apple fruit ripening variants. Hortscience 28(2): 135-137

Ethylene production and fruit softening during postharvest storage of several apple (Malus domestica Borkh.) ripening variants were compared with two standard cultivars. PA14-238 and D101-110 produced only low levels of ethylene ( lt 10 mu-l cntdot kg-1 cntdot hour-1) at harvest and throughout most of 86 days of storage at 4 degree C, whereas 'Red Chief Delicious' and 'Golden Delicious' fruit produced lt 100 mu-l ethylene/kg per hour during the same time period. PA14-238 and D101-110 flesh disks converted aminocyclopropane-1-carboxylic acid (ACC) but not methionine (MET) to ethylene. 'Red Chief Delicious' readily converted both MET and ACC to ethylene at the end of cold storage. PA14-238 fruits were the firmest and did not soften during postharvest storage; however, D101-110 softened appreciably. NJ55 did not produce ethylene at harvest, but produced a significant amount of ethylene (90 mu-l cntdot kg-1 cntdot hour-1) during storage. Despite its high capacity to produce ethylene, NJ55 remained nearly as firm as PA14-238 at the end of cold storage.

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