Biofísica del transporte de agua en plantas : la participación de la raíz de Beta vulgaris en el ajuste hidráulico en condiciones de estrés salino
In roots, a hydraulic circuit describes two parallel water pathways: the highly resistive cell-to-cell pathway and the apoplast pathway. This topology does not highlight the properties of biological membranes (selectivity and especificity) at the cell-to -cell pathway. Here, we characterized the hyd...
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| Formato: | Tesis doctoral acceptedVersion |
| Lenguaje: | Español |
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Facultad de Farmacia y Bioquímica
2017
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| Acceso en línea: | http://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=posgraafa&cl=CL1&d=HWA_1866 http://repositoriouba.sisbi.uba.ar/gsdl/collect/posgraafa/index/assoc/HWA_1866.dir/1866.PDF |
| Aporte de: |
| Sumario: | In roots, a hydraulic circuit describes two parallel water pathways: the highly resistive cell-to-cell pathway and the apoplast pathway. This topology does not highlight the properties of biological membranes (selectivity and especificity) at the cell-to -cell pathway. Here, we characterized the hydraulic properties of Beta vulgaris roots in order to determine the cell-to-cell pathway contribution to the short - term response triggered by the increase of soil salinity. At the organ level, the root hydraulic conductivity takes two different states, in a bimodal form (on-off like switch) due to changes on the ??????? ????. At the cellular level, the water transport capacity is coupled to solute transport and it was independent of ??????? ????. Under an opposite water potential gradient, an active cell-to-cell pathway mantains the water flow from roots towards the aerial part while the apoplast pathway has a reduced contribution. Thus, the water potential gradient does not necessarily govern the water flow direction through the cell-to-cell pathway and, it could be proposed that specific mechanisms guarantee the entry and redistribution of water from the soil to the aerial part. The differences reported here suggest an alternative topology of hydraulic circuit to integrate both organ and cell level properties. |
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