Transfer of zinc from xylem to phloem in the peduncle of wheat

Herren, Thomas; Feller, Urs (1994). Transfer of zinc from xylem to phloem in the peduncle of wheat. Journal of plant nutrition, 17(9), pp. 1587-1598. Taylor & Francis 10.1080/01904169409364831

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Maturing wheat grains represent major sinks for solutes in the phloem, while the xylem sap entering the ear is mainly delivered td the glumes. Nutrients and assimilates transported in the phloem may either be exported from source organs or loaded into the sieve tubes by a xylem-to-phloem transfer in the stem. The transfer of zinc from xylem to phloem in the peduncle of wheat was investigated by feeding radiolabelled zinc into the cut xylem of detached shoots. The label accumulated in grains of shoots with an intact phloem but not in those steam-girdled below the ear. These findings indicate that zinc fed in low concentrations (0.1 - 10 mu M) entered the ear mainly via the phloem. After feeding high zinc concentrations (100 - 1000 mu M), the label was mainly retained in the stem and steam-girding below the ear was rather ineffective. These results led to the conclusion that at these high concentrations zinc was still eliminated from the xylem sap, but loaded only in a minor percentage into the phloem. The interactions between the two long distance transport systems may play an important role in the regulation of zinc transport to the maturing grains of cereals.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Plant nutrition [discontinued]
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Feller, Urs

Subjects:

500 Science > 580 Plants (Botany)

ISSN:

0190-4167

Publisher:

Taylor & Francis

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

05 Jul 2017 09:36

Last Modified:

05 Jul 2017 09:36

Publisher DOI:

10.1080/01904169409364831

BORIS DOI:

10.7892/boris.91892

URI:

https://boris.unibe.ch/id/eprint/91892

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