Abstract
With DL-aspartic-3-Cl4 acid, DL-aspartic-4-Cl4 acid, acetate-2-C14, and DL-alanine-1-C14 as tracers, lysine synthesis has been studied in a whole fern (Azolla), a whole flowering plant (Lemna), and in pollen, leaf, root, and petiole tissue cultures derived, respectively, from a gymnosperm (Ginkgo), a monocotyledon (Agave), and 2 dicotyledons (Melilotus, Helianthus). All these plant materials showed lysine-threonine-aspartic acid labeling patterns like those of the bacteria and the green algae previously examined, but unlike those of higher fungi.