【摘要】 <正> 条斑紫菜(Porphyra yezoensis Ueda)是我国北方紫菜种类中的主要人工养殖对象。要开展这种紫菜的人工养殖,首先必须培养好其丝状体,以便适时得到大量壳孢子,满足人工采苗的要求。因此,了解丝状体的生长发育同环境条件的关系,对培养好丝状体是非常必要的。 温度是影响丝状体生长发育的一个重要环境因子。关于这方面的研究工作,过去已有更多还原

【Abstract】 Growth and development of Conehocelis of Porphyra are influenced by various environmental conditions, such as temperature, nutrients, light intensity and light period, and so on, among which the temperature factor is a very important one. We have divided the conchocelis-phase into 4 different growth and development stages. The effects of temperature on the eonchocelis of Porphyra yezoensis Ueda in different stages were studied, and the results summarized as follows.1. Growth of the algal filaments The algal filaments may grow continually in a temperature range from 5℃ to 30℃, but the favorable temperature range is 20-25℃.2. Formation of the sporangial branchlets (the swollen algal filaments) The formation of the sporangial branchlets takes place in the range of 12.5-30℃, and the favorable range is also 20-25℃.3. Formation of the conchospores The conchospore formation indicated by dividing into 2 spores in each sporangium takes place only in the range of 12.5-22.5℃. Its favorable temperature is 15-20℃, apparently lower than that of the former, two stages.4. Discharge of the conchospores Conchospore discharge takes place in the range of 5-23 ℃, and in general its favorable range is also 15-20℃.The experiments of culture under changing temperature shlow that both the formation of sporangial branchlets and the formation of conchospores are inhibited in 10℃, but the matured eonchocelis may discharge conchospores in the same temperature.The algal filaments and sporangial branchlets can grow and develop well in 25℃, which temperature, however, inhibits the formation and discharge of conchospores. However, when the eonchocelis cultured in the temperature above 25℃ from the be-gining is transfered to 15-20℃, it will form and discharge conchospores in a large amount. Therefore, 25℃ seems to be a critical temperature for controlling the maturation and discharge of conchospores.In mass culture, or under natural conditions the eonchocelis may not complete its developmental process in less than 5-6 months at room temperature whereas under our experimental conditions it has completed the developmental process in a period of only 50-60 days, during which the growth of algal filaments requires about 20-26 days, the formation of sporangial branchelets about 18-38 days and the formation of conchospores about 1-7 days respectively. After maturation, the conchospores will discharge immediately.更多还原