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Phosphate-mediated increase of the sieve-tube conductance in ricinus-communis l. seedlings is accompanied by a marked acidification of the sieve-tube sap

Title data

Zhong, Wen-Jun ; Langenberger, Silke ; Komor, Ewald ; Schobert, Christian:
Phosphate-mediated increase of the sieve-tube conductance in ricinus-communis l. seedlings is accompanied by a marked acidification of the sieve-tube sap.
In: Journal of Plant Physiology. Vol. 145 (1995) Issue 4 . - pp. 453-458.
ISSN 0176-1617
DOI: https://doi.org/10.1016/S0176-1617(11)81770-0

Abstract in another language

The exudation of phloem sap from the cut hypocotyl of Ricinus seedlings was increased two-fold by incubation of the cotyledons in phosphate buffer. The analysis of osmotic potential differences revealed that this stimulation of the exudation rate was due to a five-fold increase in sieve tube conductance. Parallel measurements of sieve-tube metabolites showed that the observed changes of UDP-glucose- and ATP-levels were probably not causal for the conductance increase. The levels of calcium ions, both bound and free, increased strongly during phosphate incubation and at the same time the pH of sieve-tube sap decreased to pH 5.7.Since a similar pH-shift had been observed in springtime phloem flow of trees, concomitant with removal of dormancy callose, it is suggested that a flush of phosphate transport is responsible for the latter.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER22529
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: 12 Nov 2015 07:44
Last Modified: 12 Nov 2015 07:44
URI: https://eref.uni-bayreuth.de/id/eprint/22417