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Food Science and Technology International
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Regulation by Carbon Dioxide of Wound-induced Ethylene Biosynthesis in the Peel of Citrus Fruit

L. Zacarías

Instituto de Agroquímica y Tecnología de Alimentos. Consejo Superior de Investigaciones Científicas (CSIC), PO Box 73, 46100 Burjassot, Valencia, Spain, lzacarias{at}iata.csic.es

F. Alférez

Instituto de Agroquímica y Tecnología de Alimentos. Consejo Superior de Investigaciones Científicas (CSIC), PO Box 73, 46100 Burjassot, Valencia, Spain

The effect of carbon dioxide (CO2) on wound-induced ethylene biosynthesis in flavedo discs of mature orange fruits (Citrus sinensis L. Osbeck) is investigated. Wounding induced a marked and rapid increase on the rate of ethylene production, the content of 1-aminocyclopropane-1-carboxylic acid (ACC) and on the in vivo ACC oxidase (ACO) activity. Incubation of flavedo discs in a 15% CO2 atmosphere suppressed activation of these processes. Wound-induced ethylene production was inhibited by CO2 in a concentration-dependent manner but ACO activity was enhanced at concentrations between 1% and 5%. Kinetic analysis of the interaction between CO2 and ACO activity indicated that high CO2 acted as a noncompetitive inhibitor. Removal of CO2 after 24 h incubation did not restore normal rates of ethylene production. CO2 partially counteracted the increase in ethylene production and ACO activity induced by a pretreatment with an ethylene action inhibitor (STS, silver thiosulfate). This suggested that part of CO2 action on ethylene biosynthesis might be due to interfering ethylene action. Collectively, the results indicated that ACS activity appeared to be the major regulatory step by which CO2 suppresses wound-induced ethylene production. ACO was differentially modulated by CO2, which is being stimulated at low concentrations and inhibited at high concentrations.

Key Words: 1-aminocyclopropane-1-carboxylic acid (ACC) • ACC oxidase • carbon dioxide • ethylene • oranges • wounding

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Food Science and Technology International, Vol. 13, No. 6, 497-504 (2007)
DOI: 10.1177/1082013207087812
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This Article
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