This title appears in the Scientific Report :
2010
Please use the identifier:
http://dx.doi.org/10.1111/j.1365-3040.2010.02157.x in citations.
Contrasting dynamics of water and mineral nutrients in stems shown by stable isotope tracers and cryo-SIMS
Contrasting dynamics of water and mineral nutrients in stems shown by stable isotope tracers and cryo-SIMS
Lateral exchange of water and nutrients between xylem and surrounding tissues helps to de-couple uptake from utilization in all parts of a plant. We studied the dynamics of these exchanges, using stable isotope tracers for water (H(2)(18)O), magnesium ((26)Mg), potassium ((41)K) and calcium ((44)Ca)...
Saved in:
Personal Name(s): | Metzner, R. |
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Thorpe, M.R. / Breuer, U. / Blümler, P. / Schurr, U. / Schneider, H. U. / Schröder, W. H. | |
Contributing Institute: |
Zentralabteilung für Chemische Analysen; ZCH JARA-ENERGY; JARA-ENERGY Phytosphäre; ICG-3 |
Published in: | Plant, cell & environment (2010) S. 1393 - 1407 |
Imprint: |
Oxford [u.a.]
Wiley-Blackwell
2010
|
Physical Description: |
1393 - 1407 |
PubMed ID: |
20444220 |
DOI: |
10.1111/j.1365-3040.2010.02157.x |
Document Type: |
Journal Article |
Research Program: |
Terrestrische Umwelt |
Series Title: |
Plant, Cell and Environment
33 |
Subject (ZB): | |
Publikationsportal JuSER |
Lateral exchange of water and nutrients between xylem and surrounding tissues helps to de-couple uptake from utilization in all parts of a plant. We studied the dynamics of these exchanges, using stable isotope tracers for water (H(2)(18)O), magnesium ((26)Mg), potassium ((41)K) and calcium ((44)Ca) delivered via a cut stem for various periods to the transpiration stream of bean shoots (Phaseolus vulgaris cv. Fardenlosa Shiny). Tracers were subsequently mapped in stem cross-sections with cryo-secondary ion mass spectrometry. The water tracer equilibrated within minutes across the entire cross-section. In contrast, the nutrient tracers showed a very heterogeneous exchange between xylem vessels and the different stem tissues, even after 4 h. Dynamics of nutrients in the tissues revealed a fast and extensive exchange of nutrients in the xylem parenchyma, with, for example, calcium being completely replaced by tracer in less than 5 min. Dilution of potassium tracer during its 30 s transit in xylem sap through the stem showed that potassium concentration was up-regulated over many hours, to the extent that some of it was probably supplied by phloem recirculation from the shoot. |