Extracellular release of photosynthetic products by a pelagic blue-green alga,Trichodesmium thiebautii |
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| Authors: | Sooji Shimura Yukuya Yamaguchi Yusho Aruga Yoshihiko Fujita Shun-ei Ichimura |
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| Affiliation: | (1) Ocean Research Institute, University of Tokyo, Nakano, 164 Tokyo, Japan;(2) Department of Botany, Faculty of Science, Tokyo Kyoiku University, Otsuka, 112 Tokyo, Japan;(3) Laboratory of Phycology, Tokyo University of Fisheries, Konan, Minato-ku, 108 Tokyo, Japan;(4) Present address: Institute of Biological Science, University of Tsukuba, Sakura-mura, 300-31 Ibaraki, Japan |
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| Abstract: | Extracellular release of photosynthetic products by a pelagic blue-green alga,Trichodesmium thiebautii, was scrutinized in relation to pre-treatments in14C-method for measuring the primary productivity.The extracellular release increased markedly by the pre-treatments with such strong fixative solutions as formaldehyde and mercuric chloride. In such a case, the amount of extracellular fraction reached even almost 78 % of the total photosynthates. The extracellular release of photosynthates was dependent both on light intensity and on physiological state of algal cells. When photosynthesis was terminated by a fixative, the extracellular release was noticed even just after the fixation, and it increased with time. Thus, it appears to be difficult to deduce the real photosynthetic production capacity from the amount of cellular fraction only.The amount of extracellular fraction for unfixed samples filtered immediately after the incubation was less than 8 % of the total photosynthetic products inT. thiebautii. This value is nearly comparable to the amount of excretion reported in many cultured algae. |
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