Regulation by Carbon Dioxide of Wound-induced Ethylene Biosynthesis in the Peel of Citrus Fruit
Identifieur interne : 002435 ( Main/Curation ); précédent : 002434; suivant : 002436Regulation by Carbon Dioxide of Wound-induced Ethylene Biosynthesis in the Peel of Citrus Fruit
Auteurs : L. Zacarias [Espagne] ; F. Alferez [Espagne]Source :
- Food science and technology international [ 1082-0132 ] ; 2007.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Agrume.
English descriptors
- KwdEn :
Abstract
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.
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Pascal:08-0213358Le document en format XML
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<author><name sortKey="Zacarias, L" sort="Zacarias, L" uniqKey="Zacarias L" first="L." last="Zacarias">L. Zacarias</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Instituto de Agroquímica y Tecnología de Alimentos. Consejo Superior de Investigaciones Científicas (CSIC), PO Box 73</s1>
<s2>46100 Burjassot, Valencia</s2>
<s3>ESP</s3>
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<country>Espagne</country>
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<author><name sortKey="Alferez, F" sort="Alferez, F" uniqKey="Alferez F" first="F." last="Alferez">F. Alferez</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Instituto de Agroquímica y Tecnología de Alimentos. Consejo Superior de Investigaciones Científicas (CSIC), PO Box 73</s1>
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<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Instituto de Agroquímica y Tecnología de Alimentos. Consejo Superior de Investigaciones Científicas (CSIC), PO Box 73</s1>
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<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Instituto de Agroquímica y Tecnología de Alimentos. Consejo Superior de Investigaciones Científicas (CSIC), PO Box 73</s1>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Biosynthesis</term>
<term>Carbon dioxide</term>
<term>Carboxylic acid</term>
<term>Citrus fruit</term>
<term>Ethylene</term>
<term>Injury</term>
<term>Orange</term>
<term>Peel</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Dioxyde de carbone</term>
<term>Blessure</term>
<term>Ethylène</term>
<term>Biosynthèse</term>
<term>Pelure</term>
<term>Agrume</term>
<term>Acide carboxylique</term>
<term>Orange</term>
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<front><div type="abstract" xml:lang="en">The effect of carbon dioxide (CO<sub>2</sub>
) 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% CO<sub>2</sub>
atmosphere suppressed activation of these processes. Wound-induced ethylene production was inhibited by CO<sub>2</sub>
in a concentration-dependent manner but ACO activity was enhanced at concentrations between 1% and 5%. Kinetic analysis of the interaction between CO<sub>2</sub>
and ACO activity indicated that high CO<sub>2</sub>
acted as a noncompetitive inhibitor. Removal of CO<sub>2</sub>
after 24 h incubation did not restore normal rates of ethylene production. CO<sub>2</sub>
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 CO<sub>2</sub>
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 CO<sub>2</sub>
suppresses wound-induced ethylene production. ACO was differentially modulated by CO<sub>2</sub>
, which is being stimulated at low concentrations and inhibited at high concentrations.</div>
</front>
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