Glutamine Synthesis & Translocation in Pine

Abstract

Analyses of xylem sap of Pinus taeda showed that glutamine was the most abundant amino acid at all seasons of the year, with peak concentrations in April and in Nov.-Dec. Synthesis of glutamine from radio-active glutamate was demonstrated in seedlings of P. taeda and in isolated roots of P. serotina. Adding NH4Cl or urea to the medium increased the synthesis of radioactive glumatine, and also increased the amount of C14 translocated from roots and tops of seedlings.