Catechol Oxidase in Tissue 4

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Abstract
Catechol oxidase activity in tissue culture of apple fruit was followed during growth. Enzyme activity was not found to be correlated with the growth of the cultures. Cnltures with initially high enzyme activity show a lag in growth while enzyme activity declines. In cultures with an initial low activity, rapid growth is followed by an increase in enzyme activity which declines again as growth slows down. As the tissue ages, a greater proportion of enzyme activity is found in the soluble part of the cell. Low concentrations of O2, lowered sucrose concentrations, or raised NaCl concentrations in the medium depress growth of the culture rapidly, while their effect on enzyme activity is delayed. Rapid desiccation of the tissue causes a large increase in enzyme activity, possibly by activation, within 20 h. The subcollular distribution of enzyme is changed at the same time.

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