Pathway of mannitol formation during photosynthesis in brown algae |
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Authors: | YAMAGUCHI TOSHIJIRO; IKAWA TOMOYOSHI; NISIZAWA KAZUTOSI |
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Institution: | Botanical Institute, Tokyo Kyoiku University Otsuka, Tokyo, Japan |
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Abstract: | Eisenia bicyclis, Arame, was allowed to photosynthesize in seawatercontaining H14CO3, and 14C-mannitol was isolated fromits fronds. The ratio of 14C-total/14C1 + 14C6 in the 14C-mannitolwas found to be about 8.0 at 1 min-illumination, but graduallydecreased with time to 3.0, showing uniform radioactivity distribution.Mannitol therefore seems to be formed in brown algae throughthree carbon compounds. Enzymes which may be involved in the possible biosynthetic pathwayof mannitol, i.e. aldolase, hexose diphosphatase, mannitol-1-phosphataseand glucosephosphate isomerase were present in extracts fromseveral brown algae. Some of their properties are discussed.
1Contribution from the Shimoda Marine Biological Station ofTokyo Kyoiku University, No. 187.
2Present address: Reseach Institute, Seikagaku Kogyo Co., Ltd.,Yamato-machi, Kitatama-gun, Tokyo, Japan. (Received December 13, 1968; ) |
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