title: Effects of europium ions (Eu3+) on the distribution and related biological activities of elements in Lathyrus sativus L roots.
abstract: Scanning electron microscopic and energy-dispersive X-ray analyses were used to study the distributions of different types of elements in the epidermis, exodermis, endodermis, and vascular cylinder of the fracture face in the Lathyrus sativus L. roots in the presence or absence of Eu3+. Some index of the biological activity related to the elements binding with protein were determined also. The results showed that the tissular distributions of elements in the fracture face are different in the presence and absence of Eu3+. The atomic percentages of P, S, Ca, and Mn were influenced more than those of other elements. Eu3+ promoted the biological activities of various kinds of element. The one possible mechanism changing the biological activities was that the reaction of Eu3+ +e--> Eu2+ would influence the electron capture or transport in elements of binding protein. Another mechanism was that CaM-Ca2+ becoming CaM-Eu3+ through Eu3+ instead of Ca2+ would affect the biological activity of elements by regulating the Ca2+ level in the plant cell.
authors.affiliation: State Key Laboratory of Arid Agroecology, School of Life Science, Lanzhou University, Lanzhou, 730000, China.
authors.forename: Hong Er
authors.initials: HE
authors.lastname: Tian
authors.forename: Yong Sheng
authors.initials: YS
authors.lastname: Gao
authors.forename: Feng Min
authors.initials: FM
authors.lastname: Li
authors.forename: Fuli
authors.initials: F
authors.lastname: Zeng
mesh_terms: D000596:Amino Acids / Q000032:analysis / Q000378:metabolism; D005063:Europium / Q000494:pharmacology*; D005609:Free Radicals / Q000378:metabolism; D027807:Lathyrus / Q000187:drug effects* / Q000648:ultrastructure; D008855:Microscopy, Electron, Scanning; D018517:Plant Roots / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism* / Q000648:ultrastructure; D011073:Polyamines / Q000378:metabolism
chemical_list: D000596:Amino Acids; D005609:Free Radicals; D011073:Polyamines; D005063:Europium