Ammonia Induces Starch Degradation in Chlorella Cells

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When ammonia was added to cells of Chlorella which had fixed ^<14>CO_2 photo-synthetically, ^<14>C which had been incorporated into starch was greatly decreased. A similar effect was observed when potassium nitrate and sodium nitrite were added. The ammonia-induced decrease in ^<14>C-starch was observed in all species of Chlorella tested. With cells of C. vulgaris 11 h, most of the radioactivity in starch was recovered in sucrose, indicating that ammonia induces the conversion of starch into sucrose. The percent of ^<14>C recovered in sucrose differed from species to species and practically no recovery in sucrose was observed in C. pyrenoidosa. In most species tested, the enhancing effects of blue light and ammonia on O_2 uptake as well as the ammonia effect on starch degradation were greater in cells which had been starved in phosphate medium in the dark than in non-starved cells. In contrast, the enhancing effect of ammonia on dark CO_2 fixation was much greater in non-starved cells. C. pyrenoidosa was unique in that blue light did not show any effect on its O_2 uptake.
日本植物生理学会の論文