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RESPIRATION OF GRAPEFRUIT AND ORANGE FLAVEDO TISSUE IN RELATION TO CHILLING AND NON-CHILLING TEMPERATURES AND RESPIRATORY INHIBITORS.

Author(s) : PURVIS A. C.

Type of article: Article

Summary

IN TROPICAL FRUITS RESPIRATION IS IMPAIRED AT CHILLING TEMPERATURES AND INJURY OCCURS FROM CONSEQUENT ACCUMULATION OF FERMENTATION PRODUCTS. THEREFORE, O2 UPTAKE AND CO2 EVOLUTION BY THE FLAVEDO (COLORED PORTION OF PEEL) OF CHILL-SENSITIVE GRAPEFRUIT (CITRUS PARADISI MACF.) AND CHILL-RESISTANT ORANGE (CITRUS SINENSIS (L.) OSBECK). A BREAK IN THE ARRHENIUS PLOT OF CO2 EVOLUTION AND O2 UPTAKE BY GRAPEFRUIT TISSUES OCCURRED AT 285 K (12 C) BUT NOT BREAK WAS APPARENT IN SIMILAR PLOTS FOR ORANGE TISSUE. RESPIRATORY QUOTIENTS FOR BOTH ORANGE AND GRAPEFRUIT WERE LOWER AT CHILLING THAN NON-CHILLING TEMPERATURES. WHEN O2 UPTAKE WAS DETERMINED IN THE PRESENCE OF MAXIMAL INHIBITORY LEVELS OF CYANIDE AND SALICYLHYDROXAMIC ACID, A LARGE RESIDUAL O2 UPTAKE REMAINED. AT CHILLING TEMPERATURES, IN THE ABSENCE OF CYANIDE, SALICYLHYDROXAMIC ACID REDUCED O2 UPTAKE BY GRAPEFRUIT FLAVEDO TISSUE BY 30% BUD HAD NO EFFECT ON O2 UPTAKE BY ORANGE FLAVEDO L OXIDASES MAY HAVE A ROLE IN CHILLING INJURY OF GRAPEFRUIT FLAVEDO.

Details

  • Original title: RESPIRATION OF GRAPEFRUIT AND ORANGE FLAVEDO TISSUE IN RELATION TO CHILLING AND NON-CHILLING TEMPERATURES AND RESPIRATORY INHIBITORS.
  • Record ID : 1981-0100
  • Languages: English
  • Source: J. am. Soc. hortic. Sci. - vol. 105 - n. 2
  • Publication date: 1980/03
  • Document available for consultation in the library of the IIR headquarters only.

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