On the Life-history of Tinocladia cra ?? sa (OKAM.) KYLIN
スポンサーリンク
概要
- 論文の詳細を見る
The life-history of Tinocladia crassa (OKAM.) KYLIN was studied. In Ise- and Mikawa- bay, the alga is found from February till the end of June, and it has only unilocular sporangia in April, May and June. After liberating swarm•spores (zoospores) from the unilocular sporangia, it begins to decay and then disappears. Thereafter no macroscopic plant-body is seen in nature till the next spring, when the young plantlets appear. In the laboratory, swarm-spores (zoospores) from the unilocular sporangia develop in direct germination without conjugation and make the microscopic protonemal germlings (stre-blonemoid devolopment). When the environmental condition is good, they grow well, but when the weather becomes warmer, some cells of this protonema (germling) are covered with a thick membrane, and their contents become granular. During the summer-time, they cease their further growth and rest in this stage till the better condition comes in, when a slender minute protonemal gametophyte sprouts out from each of these resting cells. In maturity, the game-tophyte bears many multilocular sporangia, and in each of the sporangia 4-6 gametes are finally made. After escaping from the sporangium gametes swim about and they are able to conjugate. Yet, most of them not having conjugated can germinate apogamously. On the other hand, the zygote germinates directly and grows in an Anlage of the Tinocladia plant, i. e., the sporophyte. The apogamously germinated gamete develops into a slender microscopical germling which, afterwards, bears again multilocular sporangia in spite of unilocular sporangia. These results were observed by the culture experiments for about an year (from 1940, April till 1941, April). After these observations, it seems to be reasonable that, in nature, the Tinocladia plant aestivates in the stage of the thick-walled resting cells.
- 社団法人 日本水産学会の論文