Uptake and Utilization of Fructose by Anabaena variabilis ATCC 29413. Effect on Respiration and Photosynthesis

概要

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Anabaena variabilis ATCC 29413 showed a constitutive mechanism for fructose uptake which was further enhanced by growing the cells with fructose. The uptake process was energy-dependent as indicated the inhibitory effect of the uncoupler carbonylcyanide m-chlorophenyl-hydrazone (CCCP) and the reduction induced by incubating the cells in the dark or in the light with DCMU. Cells adapted to growth on fructose showed increased rates of respiration both in the dark and in the light. The rate of ^<14>CO_2 evolved from radiolabelled fructose was lower in the light than in the dark or in the presence of DCMU. This fact can be partially explained by the photosynthetic reutilization of respiratory ^<14>CO_2. Modifications in photosynthesis were observed in fructose-grown cells. PS I and PS II activity measured in spheroplasts obtained by lysozyme treatment were enhanced by fructose probably as a way to compensate the lower concentration of chorophyll showed by fructose-grown cells. The photosynthetic affinity for external CO_2 and the rate of photosynthesis dependent on external inorganic carbon were reduced by fructose.
日本植物生理学会の論文