Ammonia Induces Starch Degradation in Chlorella Cells |
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Authors: | Miyachi Shizuko; Miyachi Shigetoh |
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Institution: | 1 Radioisotope Centre, University of Tokyo Bunkyo-ku, Tokyo 113, Japan
2 Institute of Applied Microbiology, University of Tokyo Bunkyo-ku, Tokyo 113, Japan |
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Abstract: | When ammonia was added to cells of Chlorella which had fixed14CO2 photo synthetically, 14C which had been incorporated intostarch was greatly decreased. A similar effect was observedwhen potassium nitrate and sodium nitrite were added. The ammonia-induceddecrease in 14C-starch was observed in all species of Chlorellatested. With cells of C. vulgaris 11h, most of the radioactivityin starch was recovered in sucrose, indicating that ammoniainduces the conversion of starch into sucrose. The percent of14C recovered in sucrose differed from species to species andpractically no recovery in sucrose was observed in C. pyrenoidosa.In most species tested, the enhancing effects of blue lightand ammonia on O2 uptake as well as the ammonia effect on starchdegradation were greater in cells which had been starved inphosphate medium in the dark than in non-starved cells. In contrast,the enhancing effect of ammonia on dark CO2 fixation was muchgreater in non-starved cells. C. pyrenoidosa was unique in thatblue light did not show any effect on its O2 uptake. (Received August 15, 1984; Accepted November 16, 1984) |
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