SUMMARYPhotosynthetic starch formation in leaf discs of spinach beet and related species can be increased more than ten fold by the presence of exogenous mannose at io~^ M. In these species, carbon from mannose is not incorporated into starch to a significant extent and the stimulation is believed to be an indirect effect resulting from the sequestration of cytoplasmic orthophosphate as mannose phosphate. In species such as tobacco, there is substantial incorporation of carbon from mannose into starch and into soluble compounds other than mannose-6-phosphate.
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