title: Inter-taxa differences in root uptake of 103/106Ru by plants.
abstract: Ruthenium-106 is of potential radioecological importance but soil-to-plant Transfer Factors for it are available only for few plant species. A Residual Maximum Likelihood (REML) procedure was used to construct a database of relative (103/106)Ru concentrations in 114 species of flowering plants including 106 species from experiments and 12 species from the literature (with 4 species in both). An Analysis of Variance (ANOVA), coded using a recent phylogeny for flowering plants, was used to identify a significant phylogenetic effect on relative mean (103/106)Ru concentrations in flowering plants. There were differences of 2,465-fold in the concentration to which plant species took up (103/106)Ru. Thirty-nine percent of the variance in inter-species differences could be ascribed to the taxonomic level of Order or above. Plants in the Orders Geraniales and Asterales had notably high uptake of (103/106)Ru compared to other plant groups. Plants on the Commelinoid monocot clades, and especially the Poaceae, had notably low uptake of (103/106)Ru. These data demonstrate that plant species are not independent units for (103/106)Ru concentrations but are linked through phylogeny. It is concluded that models of soil-to-plant transfer of (103/106)Ru should assume that; neither soil variables alone affect transfer nor plant species are independent units, and taking account of plant phylogeny might aid predictions of soil-to-plant transfer of (103/106)Ru, especially for species for which Transfer Factors are not available.
authors.affiliation: Centre for Research in Plant Science, Faculty of Applied Sciences, University of the West of England, Frenchay, Bristol BS16 1QY, UK. neil.willey@uwe.ac.uk
authors.forename: N J
authors.initials: NJ
authors.lastname: Willey
authors.forename: K
authors.initials: K
authors.lastname: Fawcett
mesh_terms: D000704:Analysis of Variance; D018517:Plant Roots / Q000378:metabolism*; D012428:Ruthenium / Q000493:pharmacokinetics*; D013045:Species Specificity
chemical_list: D012428:Ruthenium