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Sugars exchanges between vessels associated cells and xylem vessels, in relation with the temperature, in walnut

Abstract : During winter, walnut exhibits stem pressure variations depending on temperatures and due to water and sugars fluxes between the different compartments of the wood. In order to quantify the fluxes of sugars between parenchyma cells and xylem vessels in winter we have developed experimental methods to study separately the efflux and influx processes. In order to investigate the effect of temperature on each component, one-year-old twigs of walnut were conditioned during 48h at 1 degreesC or 15 degreesC before measuring sugar fluxes. The efflux was quantified by the enrichment in sugars, within one hour, in a saline solution which was substituted to the original xylem sap. The influx was quantified by the absorption of C-14-sucrose by parenchyma cells. The results show a clear effect of temperature on sugars fluxes. The efflux is very high at 1 degreesC but close to zero at 15 degreesC. At the opposite, the influx is independent of temperature during the winter but more important at 15 degreesC than at 1 degreesC in March. The efflux increased throughout the period of sampling. On the other hand, the influx is stable and low during winter. In March, the influx intensity is twice as high as in winter. In March, influx was correlated with xylem sap pH nut not during winter.
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https://hal.inrae.fr/hal-02825049
Contributor : Migration Prodinra <>
Submitted on : Saturday, June 6, 2020 - 11:20:03 PM
Last modification on : Monday, March 22, 2021 - 9:56:02 AM

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Vincent Valentin, Thierry Ameglio, André Lacointe, Jean-Louis Julien, Gilles Petel. Sugars exchanges between vessels associated cells and xylem vessels, in relation with the temperature, in walnut. Proceedings of the Fourth International Walnut Symposium, International Society Horticultural Science, 2001, 90-6605-983-4. ⟨10.17660/ActaHortic.2001.544.40⟩. ⟨hal-02825049⟩

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