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Environmental and Stress Physiology

limitation of Alternative Respiratory Pathway Activity in Grapefruit Flavedo Tissue by Oxygen Availability ¹

University of Florida, Institute of Food and Agricultural Sciences, Citrus Research and Education Center, 700 Experiment Station Road, Lake Alfred, Florida 33850

The capacity of the alternative respiratory pathway increased in the flavedo tissue of `Marsh' grapefruit (Citrus paradisi Macf.) stored at 5°C for 2 weeks or longer. Elevated O₂ levels during respiratory assays enhanced respiration by the tissue at 20°C but not at 5°C. At 20°C, salicylhydroxamic acid alone was inhibitory to O₂ uptake only in elevated O₂. In conventional Warburg studies, alternative pathway respiration may be limited by the low solubility and/or slow rate of O₂ diffusion into plant tissues, such as grapefruit flavedo, and may be responsible for the apparent low utilization of the alternative pathway potential observed in other studies.

¹ Florida Agricultural Experiment Station Journal Series No. 8222.