Changes in the Envelope Permeability of Developing Chloroplasts

Abstract
The distribution of 3H-labelled mevalonic acid, leucine and tyrosine between plastids and extraplastidic tissue in illuminated, etiolated seedlings was studied using electron microscope autoradiomicrography and radioassay of specific plastidic and extraplastidic components. There appears to be a selective change in the permeability of the plastid envelope during development which differs according to the specific substrates used.

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