TY  - JOUR
AU  - Blossfeld, S.
AU  - Perriguey, J.
AU  - Sterckeman, T.
AU  - Morel, J.-L.
AU  - Lösch, R.
TI  - Rhizosphere pH dynamics in trace-metal-contaminated soils, monitored with planar ph optodes
JO  - Plant and soil
VL  - 330
SN  - 0032-079X
CY  - Dordrecht [u.a.]
PB  - Springer Science + Business Media B.V
M1  - PreJuSER-4582
PY  - 2010
N1  - This work was supported by the "Deutscher Akademischer Austausch Dienst" (DAAD) and the "Ministere de l'Education Nationale, de l'Enseignement Superieur et de la Recherche" within the framework of the PROCOPE programme in 2008.
AB  - The present study presents new insights into pH dynamics in the rhizosphere of alpine pennycress (Noccaea caerulescens (J. Presl & C. Presl) F.K. Mey), maize (Zea mays L.) and ryegrass (Lolium perenne L.), when growing on three soils contaminated by trace metals with initial pH values varying from 5.6 to 7.4. The pH dynamics were recorded, using a recently developed 2D imaging technique based on planar pH optodes. This showed that alpine pennycress and ryegrass alkalinized their rhizosphere by up to 1.7 and 1.5 pH units, respectively, whereas maize acidified its rhizosphere by up to -0.7 pH units. The alkalinization by the roots of alpine pennycress and ryegrass was permanent and not restricted to specific root zones, whereas the acidification along the maize roots was restricted to the elongation zone and thus only temporary. Calculations showed that such pH changes should have noticeable effects on the solubility of the trace metal in the rhizosphere, and therefore on their uptake by the plants. As a result, it is suggested that models for trace metal uptake should include precise knowledge of rhizospheric pH conditions.
KW  - J (WoSType)
KW  - Alpine pennycress
KW  - Acidification
KW  - Maize
KW  - Alkalinization
KW  - Cadmium
KW  - Ryegrass
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000276234200015
DO  - DOI:10.1007/s11104-009-0190-z
UR  - https://juser.fz-juelich.de/record/4582
ER  -