Ripening-related changes in ethylene production, respiration rate and cell-wall enzyme activity in goldenberry (Physalis peruviana L.), a solanaceous species
1999
Trinchero, G.D. | Sozzi, G.O. | Cerri, A.M. | Vilella, F. | Fraschina, A.A.
The ripening of goldenberry (Physalis peruviana) is associated with a conspicuous climacteric rise in carbon dioxide and ethylene production. Its respiration rate and ethylene biosynthesis can be classified as extremely high. Ethylene yields between 7 and 24 nmol h(-1) per g in the ripe/overripe stages thus compare favorably with production rates previously reported for tomato fruit. As the fruit color turns from green (chlorophyll) to yellowish orange (carotenoids) and a progressive softening occurs, several cell-wall enzyme changes arise. Pectinmethylesterase and alpha- and beta-galactosidase reach activity levels similar to those in tomato fruit. Pectinmethylesterase and alpha-galactosidase increase toward the ripe stage. Alpha-Arabinofuranosidase and beta-glucosidase show lower activities but with an increasing pattern during ripening. On the other hand, polygalacturonase and alpha-glucosidase activities are hardly noticeable.
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