養殖ナラワスサビノリにみられた細胞の大きさ・生理活性および2・3の成分量の日変化
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概要
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Porphyra yezoensis UEDA f. narawaensis MIURA, which had been grown in the cultivation ground under alternate emersion and ever submersion, were examined on diurnal variations in photosynthetic and respiratory rates, cell size, dry/fresh weight ratio and percent contents of photosynthetic pigments, total free amino acids, total nitrogen, total alcohol soluble and insoluble carbohydrates on dry weight basis. Sampling for the diurnal variations was performed 11 times over 35 hours since 10:00 on November 8, 1976. Maximum and minimum rates of photosynthesis were found in the morning and in the evening, respectively. While, significant variations could not be observed in respiratory rates. Contents of photosynthetic pigments and total nitrogen in the thallus were found to be maximum in the early morning and minimum in the evening, on the contrary the contents of alcohol soluble and insouluble carbohydrates varied inversely. Mean cell size of thalli decreased from the end of day until it attained a minimum in the middle or late night, then it began increasing. On the dry/fresh weight ratio of the thallus, maximum ratio was observed in the evening and minimum ratio in the morning. These results were examined with special reference to the effect of emersion also. It was clear, therefore, that the thallus cultivated in the field without emersion appeared similar in diurnal variations to the thallus cultivated in the laboratory under 12 hour light and dark cycles.
- 公益社団法人 日本水産学会の論文