Ontogenetic Changes in Respiratory Pathways in Cortland Apple Skin During Storage

Abstract
Ontogenetic changes in respiratory pathways of skins of detached apple fruits were measured during a 4 mo. period. An increase in pentose pathway occurred with increasing senescence in this tissue. Variation in temperature at any given age did not result in an alteration of the C6/C1 ratio. CO2 evolution from the pentose pathway in senescent fruit was directly related to O2 uptake. Glucose uptake increased with increasing senescence indicating a change in cell permeability.