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The shoot controls zeatin riboside export from pea roots. Evidence from the branching mutant rms4


Beveridge, CA and Murfet, IC and Kerhoas, L and Sotta, B and Miginiac, E and Rameau, C, The shoot controls zeatin riboside export from pea roots. Evidence from the branching mutant rms4, The Plant Journal, 11, (2) pp. 339-345. ISSN 0960-7412 (1997) [Refereed Article]

DOI: doi:10.1046/j.1365-313X.1997.11020339.x


The rms4 mutant of pea (Pisum sativum L.) was used in grafting studies and cytokinin analyses of the root xylem sap to provide evidence that, at least for pea, the shoot can modify the import of cytokinins from the root. The rms4 mutation, which confers a phenotype with increased branching in the shoot, causes a very substantial decrease (down to 40-fold less) in the concentration of zeatin riboside (ZR) in the xylem sap of the roots. Results from grafts between wild-type (WT) and rms4 plants indicate that the concentration of cytokinins in the xylem sap of the roots is determined almost entirely by the genotype of the shoot. WT scions normalize the cytokinin concentration in the sap of rms4 mutant roots, whereas mutant scions cause WT roots to behave like those of self-grafted mutant plants. The mechanism whereby rms4 shoots of pea cause a down-regulation in the export of cytokinins from the roots is unknown at this time. However, our data provide evidence that the shoot transmits a signal to the roots and thereby controls processes involved in the regulation of cytokinin biosynthesis in the root.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant biology
Research Field:Plant physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the environmental sciences
UTAS Author:Beveridge, CA (Dr Christine Beveridge)
UTAS Author:Murfet, IC (Professor Ian Murfet)
ID Code:10354
Year Published:1997
Web of Science® Times Cited:121
Deposited By:Plant Science
Deposited On:1997-08-01
Last Modified:2011-08-11

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