title: Phytotoxicity of lanthanum in rice in haplic acrisols and cambisols.
abstract: Growth and physiological responses of rice to lanthanum were studied to elucidate the function of lanthanum in plants and its critical concentration relative to environmental safety. Shoot La content increased with the increasing added La concentrations. When shoot La content exceeded a toxic value, plant growth and chlorophyll a/b decreased and peroxidase (POD) activity, cell membrane permeability, and content of proline in the leaf increased. Leaf chlorophyll a/b and POD activity might provide useful criteria for early diagnoses of phytotoxicity of soil contaminated by La. In the present study, the critical concentration of La for rice relative to environmental safety was suggested to be 42.03 mg kg(-1) in red soil and 83.33 mg kg(-1) in paddy soil.
authors.affiliation: Institute of Soil Science, State Key Laboratory of Soil and Sustainable Agriculture, Chinese Academy of Sciences, Nanjing 210008, China. qzeng@issas.ac.cn
authors.forename: Q
authors.initials: Q
authors.lastname: Zeng
authors.forename: J G
authors.initials: JG
authors.lastname: Zhu
authors.forename: H L
authors.initials: HL
authors.lastname: Cheng
authors.forename: Z B
authors.initials: ZB
authors.lastname: Xie
authors.forename: H Y
authors.initials: HY
authors.lastname: Chu
mesh_terms: D002463:Cell Membrane Permeability / Q000187:drug effects; D002734:Chlorophyll / Q000378:metabolism; D000077194:Chlorophyll A; D004305:Dose-Response Relationship, Drug; D007811:Lanthanum / Q000032:analysis / Q000633:toxicity*; D012275:Oryza / Q000187:drug effects / Q000254:growth & development / Q000502:physiology; D009195:Peroxidase / Q000378:metabolism; D018515:Plant Leaves / Q000378:metabolism; D012639:Seeds / Q000187:drug effects / Q000254:growth & development / Q000502:physiology; D012987:Soil / Q000032:analysis; D012989:Soil Pollutants / Q000032:analysis / Q000633:toxicity*
chemical_list: D012987:Soil; D012989:Soil Pollutants; D002734:Chlorophyll; D007811:Lanthanum; D009195:Peroxidase; D000077194:Chlorophyll A