Abstract
Many physiologists have lamented the fact that there has been far too much theorizing and far too little definitive experimentation into the translocation of assimilates in the phloem. The lack of definitive experimentation can in part be explained by the complexity and the delicacy of the system being studied. But definitive experiments cannot be devised without first erecting well-defined models. We feel that the volume of theorizing would be far less lamentable if it were based on clearly stated premises and developed by the application of sound transport theory. With only a relatively few exceptions most of the “theorizing” has been qualitative, ad hoc, and more akin to imaginative pipe-dreaming. There is no doubt that the slow development of definitive and quantitative models is in large part a result of the complexity of the system and the large number of unknowns involved. To a lesser extent the development of quantitative theories is hindered by a failure to recognize the interdependence and the relative importance of the basic transport processes that may be simultaneously occurring at the same place, e.g. net diffusion down a sieve-tube lumen, bulk fluid flow down a sieve-tube lumen, and the transport of solute and solvent into and out of the sieve-tube lumen.
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Tyree, M.T., Dainty, J. (1975). Theoretical Considerations. In: Zimmermann, M.H., Milburn, J.A. (eds) Transport in Plants I. Encyclopedia of Plant Physiology, vol 1. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-66161-7_16
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DOI: https://doi.org/10.1007/978-3-642-66161-7_16
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