Solute is imported to elongating root cells of barley as a pressure driven-flow of solution

Functional Plant Biology : FPB
Nick GouldPhilip J White

Abstract

This work relates solute import to elongating root cells in barley to the water relations of the symplastic pathway under conditions of varied plant K+ status. K+ is a major constituent of phloem sieve element (SE) sap, and as an osmoticum, it is believed to have a role in maintaining SE hydrostatic pressure and thus sap flow from source to sink tissue. The hypothesis that the solute import to elongating root cells is linked to pressure driven flow from the sieve tube is examined.Plants were grown in solutions containing either 0.05 mM (low K) or 2.05 mM (high K) K+ concentration. Solute import to the root elongation zone was estimated from biomass accumulation over time accounting for respiration and root elongation rate. SE sap K+ concentration was measured using X-ray microanalyses and osmotic pressure by picolitre osmometry. SE hydrostatic pressure was measured directly with a pressure probe glued onto an excised aphid stylet. Elongating root cell hydrostatic pressure was measured using a cell pressure probe.The low-K plants had lower SE K+ concentration and SE hydrostatic pressure compared to the high-K plants, but the elongating root cell hydrostatic pressure was similar in both treatments, thus the pressure difference be...Continue Reading

Citations

Mar 7, 2013·Journal of Integrative Plant Biology·William J LucasPradeep Kachroo
Dec 5, 2014·The New Phytologist·Brian J AtwellTimothy D Colmer
Dec 21, 2017·F1000Research·Johannes Liesche, John Patrick
Dec 24, 2005·Annals of Botany·Arnold J BloomAlison R Taylor
Aug 29, 2006·Journal of Experimental Botany·C Doering-SaadJ Pritchard
Oct 1, 2004·Functional Plant Biology : FPB·John S Boyer, Wendy K Silk
Jun 10, 2020·Journal of Experimental Botany·Loïc PagèsGuillaume Pagès
Nov 1, 2005·Functional Plant Biology : FPB·Nick GouldPeter E H Minchin
Jun 15, 2010·Comptes rendus biologies·Sylvie DinantJulia Kehr

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