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Biol Bull 107: 226-235. (October 1954)
© 1954 Marine Biological Laboratory
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NITROGEN METABOLISM OF THE SLIME MOLD DICTYOSTELIUM DISCOIDEUM DURING GROWTH AND MORPHOGENESIS

JAMES H. GREGG 1, ALICE L. HACKNEY 1, and JEROME O. KRIVANEK 1

1 Department of Biology, University of Florida, Gainesville, Florida

1. Equipment and procedures incidental to determining the nitrogen metabolism of the vegetative amoebae, whole pseudoplasmodia, and fragments of pseudoplasmodia of the slime mold Dictyostelium discoideum during growth and morphogenesis have been described.

2. During the transition from the vegetative amoebae to the migrating pseudoplasmodia no statistically significant changes were found in any of the nitrogenous components under investigation.

3. During the transition from the migrating pseudoplasmodia to the mature sorocarps statistically significant decreases were found in certain nitrogenous components.

4. By analyzing spores and stalks separately it was possible to attribute nitrogen changes occurring in the intact mature sorocarps to particular regions.

5. The excretion of ammonia during the transition from the migrating pseudoplasmodia to the mature sorocarps was demonstrated.

6. The relationship between nitrogen metabolism and the synthesis of cellulose was discussed.




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