
TY  - JOUR
A1  - Pritchard, Jeremy 
A1  - Winch, Sam 
A1  - Gould, Nick 
T1  - Phloem water relations and root growth
JF  - Functional Plant Biology
JO  - Functional Plant Biol.
Y1  - 2000
VL  - 27
IS  - 6
SP  - 539
EP  - 548
KW  - apoplastic, phloem, plasmodesmata, root, sieve element, solute flux, symplastic, translocation carbon partitioning, turgor.
UR  - https://doi.org/10.1071/PP99175 
N2  - In this paper the biophysical basis of cell expansion is described, paying particular attention to the waterrelations that underpin the process. The connection of growing root cells to the rest of the plant will be addressed and possible control points in the hardware identified. Examples of environmental modification of root extension, and therefore water and solute import, are given, and the relationship with current accepted theories of solute translocation discussed. The opportunities for delivery of solutes and water to be regulated by the growing root itself will be considered, in particular the dual role of cell wall loosening in decreasing both sink cell turgor and water potential. We conclude that a significant proportion of the water for cell expansion can enter growing root cells through the phloem. The physiological data presented rule out alterations in the turgor pressure difference between sieve element and cell as a modulator of solute flux. The plasmodesmata are identified as the major control point of solute flux along the symplastic pathway. 
ER  -

