Studies in the nitrogen metabolism of the apple fruit. Changes in the nitrogen metabolism of the apple during the normal and ethylene-induced climacteric rise in rate of respiration

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Abstract
Evidence is produced that during the climacteric rise in rate of respiration in immature apples, whether occurring normally or whether induced by treatment of the fruit with ethylene, there is a highly significant rise in the net protein content of the fruit. A strong negative correlation is shown to exist between change in protein content and change in asparagine content, not only during the rise in protein which accompanies the respiration climacteric, but also during the steady fall in protein content which precedes the respiration climacteric in very young fruits. The other forms of soluble nitrogenous constituents show some negative correlation with change in protein content, but the correlation is less consistent.

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