水中におけるスギナ胞子の発芽に及ぼす水交換の影響
スポンサーリンク
概要
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When the spore of Equisetum is soaked in water and kept at temperature of about 20°to 25℃, it begins to germinate in several hours. The spores of Equisetum arvcnse L. were soaked in 10ml of tap water filtrated through the exchange resin. The first investigation was carried out to determine the relation between the density and the germination of spore. The quantities of spore, which were soaked in 10ml of water, were 10^<-1>, 5×10^<-2>, 10^<-2>, 10^<-3>, 10^<-4>, 10^<-5>and 10^<-6>g. The spores in water sank to the bottom. Therefore, the bottom area of container influences the germination of the spores soaked in water. The optimum density of the spore was from about 4×10^<-3> to 1×10^<-4> g per 10sq. cm. The higher density of spore inhibited remarkably the germination in water, but there was no great difference in the rate of germination among a series of the lower densities. This optimum density(4×10^<-3>g per 10sq. cm)was equivalent to 10g of spore per 10ml of water in the Petri dish with about 5.5cm in diameter. All the following tests were carried out in the optimum density using the Petri dish. The spores did not germinate in 8 hours after soaking in water at about 23℃, but germinate by 24 hours. They did not germinate in water of 5℃. The study on the effect of water-exchange on the germination of spores in water was performed as follows : (1) The water in which the spores were soaked at about 23℃ was exchanged for fresh tap water after 8 hours from the beginning of the experiment. The spores were exposed to scattered light during presoaking process. (2) The water in which the spores were soaked at 5℃ was exchanged for fresh tap water after 24 hours. The spores were placed in the dark. (3)The water in which the spores were soaked at 23℃ was exchanged for fresh tap water after 24 hours. The spores were exposed to scattered light for the first about 10 hours of presoaking process. In (1) and (2), when water was exchanged, the spores did not germinate yet, but in (3) germinated already. After exchange of water, all the sets were placed in the room of about 23℃, and the spores were observed on the germination after 30 hours. The sets in which water was exchanged before the germination of spores showed a decrease in the rate of germination as compared with that of the respective controls in which the water was not exchanged. Exchanging water after germination gave no effect on the subsequent growth of rhizoid.
- 日本生態学会の論文
- 1958-12-30
著者
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