Abstract
Abstract ‘Hamlin’ and ‘Valencia’ sweet orange fruit [Citrus sinensis (L.) Osbeck] explants responded to cycloheximide [CHI = 3-[2-(3,5-dimethyl-2-oxocyclohexyl)-2-hydroxyethyl] glutarimide] by increased ethylene and cellulase production, which decreased fruit removal force (FRF). Succinic acid-2,2-dimethyl hydrazide (SADH) applied with CHI increased ethylene production in ‘Valencia’ but not ‘Hamlin’ oranges. Cellulase and FRF remained unchanged when ethylene was removed by reduced atmospheric pressure. Partially regreened ‘Valencia’ oranges responded to SADH plus CHI with increased ethylene production. This possibly indicated that more CHI penetrated the rind when SADH was applied. Mature ‘Pineapple’ sweet oranges sprayed with CHI did not respond to SADH treatments with increased ethylene production.
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