Abstract

SUMMARYThe apportioning of newly fixed carbon in leaf discs of sugar beet (Beta vulgaris L.) is dependent on the incubation medium. Concentration of orthophosphate (Pi) influences the distribution of carbon between chloroplast starch and the cytoplasm, and the proportion of 14C incorporated into sucrose. In the presence of exogenous sucrose and glucose, starch synthesis is enhanced and gross changes in cytoplasmic metabolite pools occur. These observations are discussed in relation to sink/source interactions of whole plants. In the presence of mannose, which sequesters cytoplasmic Pi in leaves of sugar beet as mannose‐6‐phosphate, sucrose synthesis is severely inhibited and maltose accounts for up to 30 % of the fixed carbon. This is related to earlier reports of unusual accumulation of maltose.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.