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Lee, Seong Hee ; Singh, Adya Prasad ; Chung, Gap Chae ; Ahn, Sung Ju ; Noh, Eun Kyeung ; Steudle, Ernst:
Exposure of roots of cucumber (Cucumis sativus) to low temperature severely reduces root pressure, hydraulic conductivity and active transport of nutrients.
In: Physiologia Plantarum.
Bd. 120
(2004)
Heft 3
.
- S. 413-420.
ISSN 1399-3054
DOI: https://doi.org/10.1111/j.0031-9317.2004.00248.x
Abstract
When root temperature dropped below 25degreesC, there was a sharp drop in the root pressure (P-r) and hydraulic conductivity of excised roots (Lp(r)) of young cucumber (Cucumis sativus L.) seedlings as measured with the root pressure probe. A detailed analysis of root hydraulics provided evidence for a larger reduction in the osmotic component of Lp(r) (77%) in comparison with the hydrostatic component (34%) in response to the exposure of the root system to 13degreesC. The activity of the plasma membrane H+-ATPase (EC 3.6.1.35) was reduced from 30 to 16 mumol Pi mg(-1) protein h(-1) upon exposure to 8degreesC for 1 day. Ultrastructural observations showed no evidence of loosening of the microstructure of endodermal cell walls in low temperature (LT)-treated roots. It is concluded that the rapid drop in the P-r in response to LT is largely caused by a reduction in the activity of the plasma membrane H+-ATPase rather than by loosening of the endodermal wall which would cause substantial solute losses. On the other hand, water permeability of root cell membrane at LT was related to changes in the activity (open/closed state) of water channels.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER33593 |
| Institutionen der Universität: | Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Pflanzenökologie Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 11 Sep 2015 06:34 |
| Letzte Änderung: | 11 Sep 2015 06:34 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/19238 |