We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Short Term Interactions between Flows of Photosynthate.
- Authors
THORPE, M. R.; LANG, ALEXANDER; MINCHIN, P. E. H.
- Abstract
Using radioactive tracers, interactions between flows of photosynthetic assimilate were observed with several species. Changes in translocation from one source (brought about by repeated chilling and re-warming which stops and re-starts flow) can cause an immediate and partially compensating change in translocation from another source. The rapidity of response implies the transmission of a physical rather than a chemical signal. The compensation can be sustained for at least 90 min and involves a change in the speed of sap flow rather than a change in its concentration. A change in the rate of loading in the source (lamina) is probably involved, but this is not always the case, for it seems that the signal calling for extra assimilate is a lowering of sieve tube pressure potential and this is transmitted over only rather short distances of stem (though over quite long distances of petiole), because of entry of water and assimilate (loading) from stores in close proximity to the pathway. The response is buffered therefore and becomes less evident as one moves away from the site of treatment.
- Publication
Journal of Experimental Botany, 1983, Vol 34, Issue 1, p10
- ISSN
0022-0957
- Publication type
Article