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Effect of high temperature stress on ethylene biosynthesis, respiration and ripening of 'Hayward' kiwifruit.

Antunes, M. D. C.; Sfakiotakis, E. M.;

Postharvest Biology and Technology Year: 2000 Vol: 20 Issue: 3 Pages: 251-259 Ref: 25 ref.

2000

บทคัดย่อ

Effect of high temperature stress on ethylene biosynthesis, respiration and ripening of 'Hayward' kiwifruit.

Temperatures up to 35 deg C have been shown to increase ethylene production and ripening of propylene-treated kiwifruit. We attempted to study the regulation by high stress temperature of the propylene induced ethylene biosynthesis and ripening in Hayward kiwifruits. Hayward kiwifruits were treated with 130 micro l/l propylene at temperatures from 30 to 45 deg C up to 120 h. Ethylene biosynthesis pathway and fruit ripening were investigated. Propylene induced normal ripening of kiwifruits at 30-34 deg C. Fruits failed to ripen normally at 38 deg C and above 40 deg C ripening was inhibited. Propylene induced autocatalytic ethylene production after a lag period of 24 h at 30-34 deg C. Ethylene production was drastically reduced at 38 deg C and almost nil at 40 deg C. The 1-aminocyclopropane-1-carboxylic acid (ACC) content was similar at 30-38 deg C and was very low at 40 deg C. The 1-aminocyclopropane-1-carboxylate synthase (ACC synthase) and 1-aminocyclopropane-1-carboxylate oxidase (ACC oxidase)

 activities decreased with a temperature increase above 30 deg C, but ACC oxidase decreased at a faster rate than ACC synthase. Fruits not treated with propylene showed no ripening response or ethylene production. However, kiwifruit respiration rate increased with temperature up to 45 deg C, reaching the respiration peak in 10 h. At temperatures up to 38 deg C, propylene treatment enhanced the respiration rate. After 48 h at 45 deg C, fruits showed injury symptoms and a larger decrease in CO2. The results suggest that high temperature stress inhibits ripening by inhibiting ethylene production and sensitivity while respiration proceeds until the breakdown of tissues.