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When disks of carrot (Daucus carota) phloem parenchyma are incubated for 6 days there is a 10-fold increase in cell wall hydroxyproline due to the synthesis and secretion of hydroxyproline-containing macromolecules. The synthesis of these molecules and their secretion are demonstrated by measuring the kinetics of incorporation and of chase of (14)C-proline and hydroxyproline in different fractions of the cytoplasm and the cell wall. The hydroxyproline-containing molecules which are secreted are associated with the membranous organelles of the cytoplasm. They can be fractionated into trichloroacetic acid-soluble and trichloroacetic acid-precipitated fractions. The properties of the trichloroacetic acid-soluble fraction associated with the membranous organelles are consistent with its role as a cell wall precursor.

Synthesis and Secretion of Hydroxyproline Containing Macromolecules in Carrots. I. Kinetic Analysis