アサクサノリ(Porphyra tenera KJELLM.)糸状体の生態-I
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概要
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Thuret, Berthold and many other investigators have reported that protonema-like bodies are formed when carpospore of various species of Porphyra germinate in culture, but they failed to obtain new fronds. Since Drew reported that carpospores of P. umbilicalis penetrate into the shell and develop to a protonema-like body, on which such sporangia are formed as Batters observed as sporangia for Conchocelis rosea. In our country, the same facts were ascertained by Arasaki and Kurogi on the carpospope of P. tenera. In the present papers, the early stage of penetration of the carpospore into the shell and ecological studies of monosporangium was reported on P. tenera. After the spore attaches itself on the surface of shells, its contents penetrate in one to three days leaving the cell membrane on the surface of shell. A small hole which opens into the first chamber could easily be observed. A short tunnel is pushed out from the first chamber and it swells again, which is the second chamber. Two tunnels shoot off from the second chamber, one running in the same direction as the second chamber has been formed. (Fig. A, B, C, D, E) (Plate 1, 2) As the tunnels grow longer, they send off two opposity branches, but sometimes one or three branches are observed. Thus protonema-like bodies continue growth and can be seen as dark-purple spots by naked eye. Monosporangia are formed as lateral branch. Although Kurogi claim the monosporangial branches “simple and slightly branched inflations”, it is so only in the beginning, but many branches are formed later. (Plate 4) Some branches erect up toward the surface of shell and finally opens to the surface. (Plate 5) The monospores are liberated from this opening. In the culture, many monosporangia were found in the beginning or middle of August and the liberation of the spores began in the middle of September. After liberating the monospore Kurogi has reported that the protonema-like bodies die, but by authors experiments they all resist alive, forming monosporangia again in the next spring.