Abstract
The transport and accumulation of 14C activity in decapitated, non-growing internodes of Phaseolus vulgaris L following application of 14C-sucrose or 14CO2 is stimulated by application of auxins, cytokinins and gibberellins. The possibility that these hormone-directed effects may be mediated by stimulating the metabolism or storage of 14C-sucrose (i.e. by increasing sink ‘demand’) in the ground tissues of the stem was studied by investigations into the kinetics of 14C-sucrose uptake by thin slices of internode tissue of tomato and P. vulgaris. Sucrose uptake appears to be a carrier-mediated process, requiring active cell metabolism, and is shown to be stimulated by fusicoccin but not by indol-3yl-acetic acid (IAA). IAA only stimulates 14C-sucrose accumulation when long-distance transport is involved and it is suggested that IAA acts by stimulating the unloading of sucrose via an apoplastic pathway.
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Wareing, P.F., Adkin, M.P. 14C-sucrose uptake by internode tissue. Plant Growth Regul 2, 287–296 (1984). https://doi.org/10.1007/BF00027288
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DOI: https://doi.org/10.1007/BF00027288