The Path of Carbon in Photosynthesis, XV. Ribulose and Sedoheptulose

摘要: The intermediates of carbon dioxide reduction by plants include phosphorylated derivatives hydroxy acids and sugars. Their identification becane possible when the use labeled permitted discrimination between earliest products many other components photosynthetic tissues. A number compounds were identified virtue chemical physical properties radioactive in tracer amounts direct comparison these with those suspected known metabolic intermediates. It became apparent that several found short exposures to not substances previously as Two phosphate esters particular observed first few seconds steady-state photosynthesis all microorganisms higher examined this laboratory. These have been isolated paper chromatography quantities enzymatically hydrolyzed give two sugars, ribulose sedoheptulose. This contains a description sugars some observations suggestions regarding function their esters. general importance was surmized before identification. C{sup 14}O{sub 2} each plant included estersmore » same then unknown addition expected glucose, fructose, dihydroxyacetone glyceric acid. As time decreased, fractions total fixed radiocarbon unidentified increased.« less