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Water transport in plants: Role of the apoplast

Title data

Steudle, Ernst ; Frensch, Jürgen:
Water transport in plants: Role of the apoplast.
In: Plant and Soil. Vol. 187 (1996) Issue 1 . - pp. 67-79.
ISSN 1573-5036
DOI: https://doi.org/10.1007/BF00011658

Abstract in another language

The present state of modelling of water transport across plant tissue is reviewed. A mathematical model is presented which incorporates the cell-to-cell (protoplastic) and the parallel apoplastic path. It is shown that hydraulic and osmotic properties of the apoplast may contribute substantially to the overall hydraulic conductivity of tissues (Lp(r)) and reflection coefficients (sigma(sr)). The model shows how water and solutes interact with each other during their passage across tissues which are considered as a network of hydraulic resistors and capacitances ('composite transport model'). Emphasis is on the fact that hydraulic properties of tissues depend on the nature of the driving force. Osmotic gradients cause a much smaller tissue Lp(r) than hydrostatic. Depending on the conditions, this results in variable hydraulic resistances of tissues and plant organs. For the root, the model readily explains the well-known phenomenon of variable hydraulic resistance for the uptake of water and non-linear force/flow relations. Along the cell-to-cell (protoplastic) path, water flow may be regulated by the opening and closing of selective water channels (aquaporins) which have been shown to be affected by different environmental factors.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER33660
Institutions of the University: Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Ecology
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 24 Sep 2015 09:39
Last Modified: 24 Sep 2015 09:39
URI: https://eref.uni-bayreuth.de/id/eprint/19753