"GIGANTISM" OF CHLORELLA VULGARIS II. MECHANISM OF INDUCTION OF CIGANTISM
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概要
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1. Based on the microscopic observations, two stages, "giant cell stage" and the subsequent "palmelloid body stage", were distinguished in the process of formation of giant Chlorella induced by the addition of sugars. The "giant cell" is much larger in size than the control cell, but the other morphological features are the same as those of the latter. The "palmelloid body" is a from composed of many conjoined autospores. 2. When a high concentration of glucose was maintained in the medium, gigantism was also maintained. Under this condition, the alga shows a cyclic transformation between "giant cell" and " palmelloid body" without returning to the small single cells. 3. Large amounts of carbohydrate composed of hexose were found to be accumulated in the giant algal cells, and it was inferred that this carbohydrate accumulation causes greater enlargement of cell volume as compared with control cells. 4. Uronic acids, which were found to be absent in the control cells, were formed and lost in the cells cultured in the glucose medium in parallel with the appearance and disappearance of gigantism. 5. Pectic substances, from which uronic acids are considered to be derived during the extraction procedure, were found to be present only in giant Chlorella. 6. The conjoined autospores in giant Chlorella (at the palmelloid body stage) were separated to some extent by the addition of EDTA, and the resulting cells were similar to control Chlorella cells. 7. Based on these results it was inferred that inductive formation of the pectic substances is causally related with the appearance of "palmelloid body".
- 日本植物生理学会の論文
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関連論文
- "GIGANTISM" OF CHLORELLA VULGARIS I. RELATION OF GIGANTISM TO CELL GROWTH AND DIVISION
- "GIGANTISM" OF CHLORELLA VULGARIS II. MECHANISM OF INDUCTION OF CIGANTISM