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Apoplastic transport of abscisic acid through roots of maize: effect of the exodermis

Title data

Freundl, Elenor ; Steudle, Ernst ; Hartung, Wolfram:
Apoplastic transport of abscisic acid through roots of maize: effect of the exodermis.
In: Planta. Vol. 210 (2000) Issue 2 . - pp. 222-231.
ISSN 0032-0935
DOI: https://doi.org/10.1007/PL00008129

Abstract in another language

The exodermal layers that are formed in maize roots during aeroponic culture were investigated with respect to the radial transport of cis-abscisic acid (ABA). The decrease in root hydraulic conductivity (Lp(r)) of aeroponically grown roots was stimulated 1.5-fold by ABA (500 nM), reaching Lp(r) values of roots lacking an exodermis. Similar to water, the radial flow of ABA through roots (J(ABA)) and ABA uptake into root tissue were reduced by a factor of about three as a result of the existence of an exodermis. Thus. due to the cooperation between water and solute transport the development of the ABA signal in the xylem was not affected. This resulted in unchanged reflection coeffcients for roots grown hydroponically and aeroponically. Despite the well-accepted barrier properties of exodermal layers, it is concluded that the endodermis was the more effective filter for ABA, Owing to concentration polarisation effects, ABA may accumulate ill front of the endodermal laver, a process which. for both roots possessing and lacking an exodermis, would tend to increase solvent drag and hence ABA movement into the xylem sap at increased water How (J(Vr)). This may account for the higher ABA concentrations found in the xylem at greater pressure difference.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER33631
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 09:38
Last Modified: 24 Sep 2015 09:38
URI: https://eref.uni-bayreuth.de/id/eprint/19648