By Henry C. Aldrich
Booklet via Aldrich, Henry C.
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Additional info for Cell Biology of Physarum and Didymium. Organisms, Nucleus, and Cell Cycle
Bacteria are apparently their primary natural food source, and these are phagocytized by cells in either the amoebal or the flagellate state. However, mitosis is known to occur only in amoebae, probably because in the swarmer centrioles function as flagellar basal bodies and are thus unavailable for mitosis. Schuster (1965) and S. J. Kerr (1967) pointed out that centrioles of the amoebal stage are not retained throughout the life cycle and, extrapolating from the work by Aldrich (1967) on P. flavicomum, it is assumed that centrioles in D.
He reported up to 100% sporulation in all plasmodia exposed to whole light for 1 minute at 30 ft-c, and an exposure as short as 5 seconds at 30 ft-c resulted in 23% sporulation. On the other hand, preliminary experiments 2. Didymium iridis in Past and Future Research 45 indicate that there is no absolute requirement of light for sporulation in D. iridis. We observed that single-spore cultures of some nonheterothallic isolates, or crosses of heterothallic isolates maintained in total darkness can sporulate.
Incompatibility Systems The plasmodium is one of two assimilative stages in the diplohaplontic life cycle of D. iridis. In the absence of a good food supply, the plasmodium migrates rapidly over solid surfaces, a characteristic which enables it to encounter possible new or better grazing areas. This capacity to migrate is useful to investigators in a variety of research areas, and it has been extensively taken advantage of in studies on the genetics of plasmodial incompatibility in D. iridis. For example, transfers of plasmodia can be placed side by side on an agar surface and allowed to migrate toward each other.
Cell Biology of Physarum and Didymium. Organisms, Nucleus, and Cell Cycle by Henry C. Aldrich