caa a22 4500 477109640 CHVBK 20180405111605.0 cr unu---uuuuu 170330e19960301xx s 000 0 eng 10.1007/BF02257560 doi (NATIONALLICENCE)springer-10.1007/BF02257560 Beck Erwin Lehrstuhl für Pflanzenphysiologie, Universität Bayreuth, Universitätsstr. 3, 95440, Bayreuth, Germany aut Regulation of shoot/root ratio by cytokinins from roots in Urtica dioica [Elektronische Daten] Opinion [Erwin Beck] According to current knowledge, cytokinins are predominantly root-born phytohormones which are transported into the shoot by the transpiration stream. In the "hormone message concept” they are considered the root signals, which mediate the flux of the photosynthates to the various sinks of the plant. In this review, experiments are assessed, in which changes of the shoot to root ratio of biomass, caused by different levels of nitrogen supply to a model plant,Urtica dioica, could be traced to the natural cytokinin relations of the plant. Disturbance of the internal cytokinin balance of the plant resulted in a disproportionate distribution of the assimilates in favour of the cytokinin-enriched shoot. Inspite of some shortcomings of the "hormone message concept”, the presented work corroborates the significance of root-sourced cytokinins in the regulation of biomass partitioning between shoot and root. Kluwer Academic Publishers, 1996 cytokinins nationallicence nitrogen supply nationallicence quantitative patterns and fluxes nationallicence root signal nationallicence shoot to root ratio of biomass nationallicence Urtica dioica nationallicence S/R ratio : shoot:root ratio of biomass (dry matter) nationallicence Z : zeatin nationallicence ZR : zeatin riboside nationallicence OG : O-glucoside nationallicence Plant and Soil Kluwer Academic Publishers 185/1(1996-03-01), 1-12 0032-079X 185:1<1 1996 185 11104 https://doi.org/10.1007/BF02257560 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02257560 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Beck Erwin Lehrstuhl für Pflanzenphysiologie, Universität Bayreuth, Universitätsstr. 3, 95440, Bayreuth, Germany aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers 185/1(1996-03-01), 1-12 0032-079X 185:1<1 1996 185 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer