Dr Elena Khramova (CSBG SB RAS)
This study focuses on determination of element composition of plants belonging to different species of the genus Dasiphora (the Rosaceae family) occurring in East Siberia and the Russian Far East and on revel of species with high content of macro- and microelements. The plants of five species (D. fruticosa, D. parvifolia, D. mandshurica, D. gorovoii, D. davurica, and the variety D. davurica var. flava) were collected in 2013-2014 in the Russian Far East (Primorsky Krai) and in East Siberia (Buryatia) along with the samples of soil at the sites of the plant growth. Element composition was analyzed by the method of X-ray fluorescence analysis using synchrotron radiation (SRXRF) in the element analysis station of the Shared-Use Center SSTRC Budker Institute of Nuclear Physics, SB RAS (VEPP-3 storage ring). The content of 21 elements (K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Br, Rb, Sr, Y, Zr, Nb, Mo, Pb) were determined in aboveground organs (leaves and stems). The maximum total content of macroelements (K, Ca) was found in the aboveground organs of two taxa – D. davurica and D. davurica var. flava (232-331 mg/g), and the minimum in the leaves of D. mandshurica (14 mg/g) and in the stems of D. fruticosa (15 mg/g). The highest total content of microelements, from 1937 to 2435 mg/kg, was found in the aboveground organs of D. gorovoii, D. mandshurica, and D. fruticosa, and a minimum in the leaves and stem of D. davurica var. flava, 215 and 233 mg/kg respectively. We found that each species had a certain concentration of elements. The highest content of Ti, V, Co, Ni and Nb was found in the stems of D. fruticosa, Zr in leaves of D. parvifolia. The aboveground organs of D. mandshurica, accumulate a high level of Br, and have an increased content of Fe, Mn, Cu, As, Sr and Pb in the stems. The leaves and stems of D. gorovoii plants accumulate, predominantly Mn, Cr, Rb, Y and have particularly high content of Zn, the concentration of which 5.5 times exceeded the average concentrations of this element in plants (Kabata-Pendias, Pendias, 1989). The highest content of Mo was found in the stems of D. davurica var. flava. The leaves and stems of D. davurica and the stems of D. fruticosa include the traces of Se that contrast the other species, where Se is below the detection limit or completely absent. The high content of Ti, V, Mn, Co, Ni, Cu, Zn, As, Rb, Y, Zr in plants correlates with content of these elements in the soils of the sampling sites. We found that the high content of a number of individual elements examined, depending on the organ of a plant, characterizes three representatives of the genus Dasiphora – D. fruticosa, D. mandshurica and D. gorovoii. Additionally, these species demonstrate the excessive levels of the potentially toxic chemical elements: Ni and Pb. Kabata-Pendias A., Pendias H. Trace Elements in Soils and Plants; Mir: Moscow, Russia, 1989. 439 p.
Ms Elena Andysheva (Vladimirovna)