Effects of streptomycin on plastids in dividing Euglena.
The plastids of dividing Euglena cells growing in the light in the presence of streptomycin decreased in length after a lag period of seven generations. The typical structure of the chloroplast was lost after a similar lag period. This loss of structure did not follow a regular pattern. After 11 generations the plastids resembled normal proplastids of dark-grown cells. Initial chlorophyll loss of treated cells was slow, but after 3 generations the rate of loss was about 0.5/generation, indicating a cessation of synthesis and a dilution among the progeny.
Laboratory for Electron Microscopy, Tel Aviv University, Tel Aviv, Israel.
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Ben-Shaul
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Ophir