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

AUTOR(ES)

Purvis, Albert C.

RESUMO

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.

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