Articles
BIOCHEMICAL BASIS OF THERMOREGULATION OF ETHYLENE PRODUCTION AND RIPENING OF ‘HAYWARD’ KIWIFRUIT
Article number
444_83
Pages
541 – 546
Language
Abstract
It has been shown in a previous work that there is thermoregulation of ethylene biosynthesis and ripening in kiwifruit.
The aim of this research was to study the effect of temperatures from 10° to 40°C on the enzymes of ethylene biosynthetic pathway in connection with ripening induced by propylene. ‘Hayward’ kiwifruit were treated with or without 130p propylene at temperatures 10°, 20°, 30°, 34°, 38° and 40°C. Ethylene production, 1-aminocyclopropane-1-carboxylic acid content (ACC) and ACC synthase and ACC oxidase also named ethylene-forming enzyme (EFE) activities, as well as changes in respiration rate, soluble solids content (SSC) and flesh firmness were measured during a storage period of 120 to 350 hours.
Propylene induced the fruit to ripen in temperatures from 10° to 38°C while control showed no ripening response.
Propylene also induced ethylene and ACC production in the temperature range from 20° to 34°C with concomitant induction of ACC synthase and EFE activities.
There was a strong inhibition of ethylene production at 10°, 38° and 40°C. Ripening as evaluated by flesh firmness and SSC was inhibited at high temperatures (38°-40°C). As temperature was increased the respiration rate was also increased.
Propylene treatment enhanced the respiration rate in all temperatures except 40°C.
The aim of this research was to study the effect of temperatures from 10° to 40°C on the enzymes of ethylene biosynthetic pathway in connection with ripening induced by propylene. ‘Hayward’ kiwifruit were treated with or without 130p propylene at temperatures 10°, 20°, 30°, 34°, 38° and 40°C. Ethylene production, 1-aminocyclopropane-1-carboxylic acid content (ACC) and ACC synthase and ACC oxidase also named ethylene-forming enzyme (EFE) activities, as well as changes in respiration rate, soluble solids content (SSC) and flesh firmness were measured during a storage period of 120 to 350 hours.
Propylene induced the fruit to ripen in temperatures from 10° to 38°C while control showed no ripening response.
Propylene also induced ethylene and ACC production in the temperature range from 20° to 34°C with concomitant induction of ACC synthase and EFE activities.
There was a strong inhibition of ethylene production at 10°, 38° and 40°C. Ripening as evaluated by flesh firmness and SSC was inhibited at high temperatures (38°-40°C). As temperature was increased the respiration rate was also increased.
Propylene treatment enhanced the respiration rate in all temperatures except 40°C.
Publication
Authors
M.D.C. Antunes, E.M. Sfakiotakis
Keywords
1-aminocyclopropane-1-carboxylic acid, ACC synthase, ACC oxidase, ethylene, respiration, firmness, soluble solids content
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