Effects of PEG-Induced Water Deficit in Solanum nigrum on Zn and Ni Uptake and Translocation in Split Root Systems

Feller, Urs; Anders, Iwona; Wei, Shuhe (2015). Effects of PEG-Induced Water Deficit in Solanum nigrum on Zn and Ni Uptake and Translocation in Split Root Systems. Plants, 4(2), pp. 284-297. MDPI 10.3390/plants4020284

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Drought strongly influences root activities in crop plants and weeds. This paper is focused on the performance of the heavy metal accumulator Solanum nigrum, a plant which might be helpful for phytoremediation. The water potential in a split root system was decreased by the addition of polyethylene glycol (PEG 6000). Rubidium, strontium and radionuclides of heavy metals were used as markers to investigate the uptake into roots, the release to the shoot via the xylem, and finally the basipetal transport via the phloem to unlabeled roots. The uptake into the roots (total contents in the plant) was for most makers more severely decreased than the transport to the shoot or the export from the shoot to the unlabeled roots via the phloem. Regardless of the water potential in the labeling solution, 63Ni and 65Zn were selectively redistributed within the plant. From autoradiographs, it became evident that 65Zn accumulated in root tips, in the apical shoot meristem and in axillary buds, while 63Ni accumulated in young expanded leaves and roots but not in the meristems. Since both radionuclides are mobile in the phloem and are, therefore, well redistributed within the plant, the unequal transfer to shoot and root apical meristems is most likely caused by differences in the cell-to-cell transport in differentiation zones without functional phloem (immature sieve tubes).

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant nutrition (discontinued)
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Feller, Urs and Anders, Iwona

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

2223-7747

Publisher:

MDPI

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

05 Nov 2015 14:29

Last Modified:

04 Jul 2016 11:37

Publisher DOI:

10.3390/plants4020284

Uncontrolled Keywords:

drought, transport, xylem, phloem, split root system, cations, heavy metals, radionuclides, Solanum nigrum L.

BORIS DOI:

10.7892/boris.72758

URI:

https://boris.unibe.ch/id/eprint/72758

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