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Consequences of phloem pathway unloading/reloading on equilibrium flows between source and sink: a modelling approach

Abstract : It is now accepted that the transport phloem, linking major sources and sinks, is leaky, and this leakage can be considerable. Hence for phloem transport to function over the long distances observed, a large fraction of this unloaded photosynthate must be reloaded. A fraction of this unloaded solute is used to maintain tissues surrounding the phloem, as well as being stored. Also, pathway unloading/reloading acts as a short-term buffer to source and sink changes. In this work we present the first attempt to include both pathway unloading and reloading of carbohydrate in the modelling of pressure driven flow to determine if this has any significant effect upon source-sink dynamics. Our results indicated that the flow does not follow Poiseuille dynamics, and that pathway unloading alters the solute concentration and hydrostatic pressure profiles. Hence, measurement of either of these without considerable other detail tells us very little about the flow mechanisms. With adequate reloading along the pathway, the effects of pathway unloading can completely compensate for, making the entire system look like one with no pathway unloading.
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https://hal.archives-ouvertes.fr/hal-01533857
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Submitted on : Tuesday, June 6, 2017 - 8:39:57 PM
Last modification on : Wednesday, February 24, 2021 - 3:30:51 AM

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Peter Minchin, André Lacointe. Consequences of phloem pathway unloading/reloading on equilibrium flows between source and sink: a modelling approach. Functional Plant Biology, CSIRO Publishing, 2017, 44 (5), pp.507-514. ⟨10.1071/fp16354⟩. ⟨hal-01533857⟩

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