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Abstract
Effect of light on the uptake, utilization and transport of sugars. — The effect of light on the uptake of saccharides, their incorporation into insoluble fractions and their transport by green tissues has been studied under conditions of complete inhibition of the photosynthetic assimilation of CO2. Such conditions were obtained by means of either an inhibitor of O2 evolution (CMU), or by running the experiment in CO2-free atmosphere. When Wolffia arryza plants are incubated with glucose-C14, light stimulates the incorporation of C14 into all fractions examined, and especially into the polysaccharides, like cellulose,' which are synthesized outside the chloroplasts.
Experiments with Elodea canadensis have shown that light stimulates the transport of glucose-C14 from the leaves to the stems, independently of the presence or absence of CO2 assimilation.
These experiments support the hypothesis that ATP synthesyzed in the light by chloroplasts can be utilized by green cells as an energy source for biosyntheses outside the plastids, as well as for other types of biological work, such as active uptake and transport.