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Water and solute transport along developing maize roots

Title data

Frensch, Jürgen ; Hsiao, Theodore C. ; Steudle, Ernst:
Water and solute transport along developing maize roots.
In: Planta. Vol. 198 (1996) Issue 3 . - pp. 348-355.
ISSN 0032-0935
DOI: https://doi.org/10.1007/BF00620050

Abstract in another language

Hydraulic and osmotic properties were measured along developing maize (Zea mays L.) roots at distances between 15 and 465 mm from the root tip to quantify the effects of changes in root structure on the radial and longitudinal movement of water and solutes (ions). Root development generated regions of different hydraulic and osmotic properties. Close to the root tip, passive solute permeability (root permeability coefficient, P-sr was high and selectivity (root reflection coeffcient, sigma(sr)) low, indicative of an imperfect semipermeable root structure. Within the apical 100-150 mm, P-sr decreased by an order of magnitude and sigma(sr), increased significantly. Root hydraulic conductivity (Lp(r)) depended on the nature of the force (hydrostatic and osmotic). Osmotic Lp(r) was smaller by an order of magnitude than hydrostatic Lp(r) and decreased with increasing distance from the root tip. Throughout the root, responses in turgor of cortical cells and late metaxylem to step changes in xylem pressure applied to the base of excised roots were measured at high spatial resolution. The resulting profiles of radial and longitudinal propagation of pressure showed that the endodermis had become the major hydraulic barrier in older parts of the root, i.e. at distances from the apex > 150 mm. Other than at the endodermis, no significant radial hydraulic resistance could be detected. The results permit a detailed analysis of the root's composite structure which is important for its function in collecting and translocating water and nutrients.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER33666
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/19746