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| Content Provider | PubMed Central |
|---|---|
| Author | Lovett, James S. |
| Abstract | Freshly harvested zoospores of Blastocladiella emersonii begin to germinate about 15 min after inoculation into a defined growth medium at a density of 106 zoospores per ml. Flagellum retraction accompanies encystment, and dispersal of the ribosomal nuclear cap takes place shortly thereafter. The primary rhizoid begins to emerge at 25 to 30 min and starts to branch at ca. 60 min. The first nuclear division occurs between 120 and 190 min. The dry weight per cell increases linearly after 60 min, whereas the deoxyribonucleic acid per cell doubles between 120 and 240 min. A linear increase in total ribonucleic acid (RNA) is detectable beginning at 40 to 45 min, and in total protein beginning at 80 min; neither process is interrupted during nuclear division. Encystment and nuclear cap disorganization are associated with a sharp rise in the rates of precursor incorporation into RNA and protein. Cycloheximide at 20 μg/ml prevents leucine incorporation at all stages and inhibits development beyond the earliest encystment stage. Actinomycin D at 25 μg to 50 μg/ml prevents uracil incorporation, but it has no effect on leucine incorporation or development until 40 to 45 min. At the latter stage, actinomycin D causes a sharp developmental arrest and begins to inhibit leucine incorporation. It is concluded that early protein synthesis must occur on the ribosomes formed during the prior growth phase and conserved through the zoospore stage in the nuclear cap. The results further indicate that this synthesis is dependent upon messenger RNA already present in the zoospore before germination. |
| Starting Page | 962 |
| File Format | |
| ISSN | 10985530 |
| e-ISSN | 10985530 |
| Journal | Journal of Bacteriology |
| Issue Number | 4 |
| Volume Number | 96 |
| Language | English |
| Publisher Date | 1968-10-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Molecular Biology Microbiology |
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