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Foliar Senescence in Perilla frutescens (L.) Britt. The Mechanism of [2-14C] Glycine Uptake and Incorporation into Protein by Leaf Discs

K. Hardwick and H. W. Woolhouse
The New Phytologist
Vol. 67, No. 2 (Apr., 1968), pp. 241-246
Published by: Wiley on behalf of the New Phytologist Trust
Stable URL: http://www.jstor.org/stable/2430418
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Foliar Senescence in Perilla frutescens (L.) Britt. The Mechanism of [2-14C] Glycine Uptake and Incorporation into Protein by Leaf Discs
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Abstract

The uptake of [2-14C]glycine by leaf discs of Perilla is shown to be a passive process which takes place primarily through the cut edges of the discs. Penetration of the label towards the centre of the discs proceeded only slowly and even after 24 hours on a radioactive solution the amount of isotope in the central region of the disc was no more than 30% of that in an equal area of the outer region. Incorporation of 14C was stimulated by light and increased temperature and partially inhibited by chloramphenicol. The total uptake of label into the discs increased markedly in the course of senescence; this factor may provide useful information concerning the change in permeability of the tissues with age but makes it difficult to draw any firm conclusions concerning the rates of protein synthesis in the course of senescence. The data obtained are discussed and serious doubts cast on the qualitative or quantitative value of many studies involving the use of leaf discs.

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