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Local Metabolic Autonomy in Phycomyces Sporangiophores ¹

^a Division of Biology, California Institute of Technology, Pasadena, California 91109

The degree of dependence of the growing zone of the Phycomyces sporangiophore upon other parts of the stalk was tested by inhibiting glycolysis and oxidative phosphorylation in the stalk below the growing zone. Initially the growing zone is capable of nearly normal growth when the metabolism in the rest of the stalk is inhibited in this way. However, the growing zone appears to become depleted of something normally supplied from below, because after 3 to 4 hr its growth rate slows down and the growth stops much sooner than in normal sporangiophores. The rest of the sporangiophore appears to have a similar degree of local autonomy because isolated sections from below the growing zone can support protoplasmic streaming for 10 to 20 hr.

¹ This work was supported by NIH Grant 1-F2-GM-20, 270-01, USPH Training Grant GM-0086, and NSF Grant GB 4642.