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Metabolism and Enzymology

Regulation of Climacteric Respiration in Ripening Avocado Fruit ¹

Department of Vegetable Crops, Mann Laboratory, University of California, Davis, California 95616, Department of Food Science and Technology, University of California, Davis, California 95616, NMR Facility, University of California, Davis, California 95616

Ripening of avocado fruit is associated with a dramatic increase in respiration. In vivo³¹P nuclear magnetic resonance spectroscopy revealed large increases in ATP levels accompanying the increase in respiration. Both glycolytic enzymes, phosphofructokinase, and pyrophosphate: fructose-6-phosphate phosphotransferase were present in avocado fruit with the latter activity being highly stimulated by fructose 2,6-bisphosphate. Fructose 2,6-bisphosphate levels increased approximately 90% at the onset of ripening, suggesting that the respiratory increase in ripening avocado fruit may be regulated by the activation of pyrophosphate:fructose-6-phosphate phosphotransferase by an increase in fructose 2,6-bisphosphate.

¹ Supported by a University of California, Davis NMR Research Award.

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