title: Interaction between cadmium and atrazine during uptake by rice seedlings (Oryza sativa L.).
abstract: The uptake of atrazine by rice seedlings (Oryza sativa L.) through plant roots from nutrient solution was investigated in the presence and absence of Cd2+ over an exposure period of four weeks. It was found that both atrazine and Cd2+ were toxic to rice seedlings. Both shoot and root biomasses decreased when the seedlings were exposed to increasing atrazine or Cd2+ concentrations in nutrient solutions. In the absence of Cd2+, a linear relationship was observed between atrazine concentrations in roots/shoots and in external solution, and more atrazine is concentrated in roots than in shoots. When atrazine and Cd2+ concentrations in solution were maintained at mole ratio of 1:1, the accumulation of atrazine by seedlings was less and the seedling biomass was greater than found with other ratios, such as 1:2 or 2:1. Therefore, the formation of the complex between atrazine and Cd2+ reduced the individual toxicities. Analyses of data with the quasi-equilibrium partition model indicated that the atrazine concentrations in rice seedlings and external water were close to equilibrium. In the presence of Cd2+, however, the measured bioconcentration factor (BCF) of atrazine with roots and shoots were considerably greater. The latter findings resulted presumably from the atrazine-Cd2+ complex formation that led to a large apparent BCF.
authors.affiliation: Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Yu-Hong
authors.initials: YH
authors.lastname: Su
authors.forename: Yong-Guan
authors.initials: YG
authors.lastname: Zhu
authors.forename: Ai-Jun
authors.initials: AJ
authors.lastname: Lin
authors.forename: Xu-Hong
authors.initials: XH
authors.lastname: Zhang
mesh_terms: D001280:Atrazine / Q000032:analysis / Q000378:metabolism* / Q000633:toxicity*; D002104:Cadmium / Q000032:analysis / Q000378:metabolism* / Q000633:toxicity*; D004347:Drug Interactions; D006540:Herbicides / Q000032:analysis / Q000378:metabolism / Q000633:toxicity; D012275:Oryza / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D018520:Plant Shoots / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D036226:Seedlings / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D012989:Soil Pollutants / Q000378:metabolism / Q000633:toxicity
chemical_list: D006540:Herbicides; D012989:Soil Pollutants; D002104:Cadmium; D001280:Atrazine