Protein Metabolism in Cultured Plant Tissues: III. Changes in the Rate of Protein Synthesis, Accumulation, and Degradation in Cultured Pith Tissue.

Plant Physiology
J D Kemp, D W Sutton


During the transition of tobacco (Nicotiana tabacum) pith tissue to callus tissue, there were changes in the composition of the soluble amino acid pools, in the distribution of amino acids between pool and protein, and in the synthesis, accumulation, and degradation of proteins. The size of the leucine pool decreased from 90 nanomoles per gram fresh weight in fresh pith to 20 nanomoles in 24-hour cultured pith, followed by a return to 90 nmoles in pith cultured longer than 5 days. The latter value is the same as that reported for exponentially growing callus cells. Many other pool amino acids changed as dramatically. However, they always approached callus levels after 5 days of culturing. The total amino acid content of pith tissue (the sum of both pool and protein) remained unchanged during culturing. The value for total amino acid content (34 to 42 nanomoles per gram fresh weight) was also similar to that found in callus. The distribution of amino acids between pool and protein did change during culturing. The transition of pith tissue with 88% of its total amino acids free in the soluble pool to callus with 92% of its amino acids in protein was further characterized by changes in protein metabolism. Both protein synthesis an...Continue Reading


Dec 1, 1970·Plant Physiology·H A Stafford, A W Galston
Feb 1, 1968·Experimental Cell Research·W E Berg
Jan 1, 1959·Biochimica Et Biophysica Acta·D B COWIE, F T McCLURE
Aug 19, 1961·Biochimica Et Biophysica Acta·D M KIPNISE HELMREICH
Nov 1, 1968·Plant Physiology·S Lavee, A W Galston
Feb 1, 1969·Plant Physiology·J P HelgesonC D Upper

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