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Crystalloids of Phycomyces Sporangiophores: Nature and Photosensitive Accumulation ¹

^a Division of Natural Sciences, University of California, Santa Cruz, California

Crystalloids accumulate in the vacuoles of the giant sporangiophores of Phycomyces blakesleeanus Burgeff during growth. On the basis of solubility in alkaline solutions, cytochemical staining reactions, trypsin sensitivity, optical absorption and response in the Lowry protein test, the crystalloids have been judged to consist principally of an acidic protein. In assays by Lowry test and by reference to optical absorption at 280 mµ, dark-grown sporangiophores were consistently found to contain from 2 to 4 times as much crystalloid material as light-grown counterparts. Concurrent assays of soluble phenolic materials revealed no significant effect of culture illumination, while carotene content of sporangiophores and mycelium was found to be raised from 2 to 4-fold by illumination during growth.

¹ This work was supported in part by predoctoral National Science Foundation Fellowships to the author and by Grant No. GB 3241 from the National Science Foundation to Professor K. V. Thimann. Some of the results were included in a thesis submitted in partial fulfillment of the requirements for the Ph.D. degree at Harvard University.