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The kinetics of sucrose concentration in the phloem of individual vascular bundles of the ricinus communis seedling measured by nuclear magnetic resonance microimaging

Title data

Verscht, Jutta ; Kalusche, Bernhard ; Köhler, Jutta ; Köckenberger, Walter ; Metzler, Alexander ; Haase, Axel ; Komor, Ewald:
The kinetics of sucrose concentration in the phloem of individual vascular bundles of the ricinus communis seedling measured by nuclear magnetic resonance microimaging.
In: Planta. Vol. 205 (1998) Issue 1 . - pp. 132-139.
ISSN 0032-0935
DOI: https://doi.org/10.1007/s004250050304

Abstract in another language

The sucrose concentration was measured at 70-min intervals in the phloem of individual bundles of the hypocotyl of Ricinus seedlings by H-1 nuclear magnetic resonance (NMR) spectroscopic imaging. The sucrose concentration stayed fairly constant in all bundles for more than 7 h if the cotyledons were embedded in the endosperm or excised and incubated in 100 mM sucrose. If, however, the sucrose solution was replaced by sucrose-free buffer solution, the sucrose levels in the phloem decreased with a kinetic depending on the seedling: in some cases there was a smooth decline, in some a decline followed by a slight recovery and in some cases a clear-cut oscillation. The sucrose concentration was often not identical in the phloem of the individual bundles. The oscillations were larger in the phloem at the apex of the hypocotyl than in the phloem at the base of the hypocotyl. Cutting the petiole of one cotyledon led to a decrease in sucrose not only in the four bundles directly connected to the severed petiole but in all eight bundles of the hypocotyl. Cutting the petiole and dividing the vascular ring at the cotyledonary node and at the root crown did not prevent the decline of sucrose in all eight bundles. Therefore, a functional equilibration of translocated solutes between the eight bundles may occur within the 1-h measuring interval by radial diffusion through the parenchyma of the hypocotyl.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER22493
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Physiology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
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: 09 Oct 2015 05:57
Last Modified: 09 Oct 2015 05:57
URI: https://eref.uni-bayreuth.de/id/eprint/20319