出版社：Thai Society of Higher Eduction Institutes on Environment
摘要：This study investigated heavy metal contamination levels and the related geneticdifferentiation in Limnocharis flava and Marsilea crenata near a municipal landfillcompared with those in a reference area using inductively coupled plasma optical emissionspectrometry (ICP-OES) and inter-simple sequence repeats (ISSR) analysis. With theexception of Mn concentration in the water, the heavy metal concentrations (As, Cd, Pb,Cr, Mn and Zn) in the water and sediment of the landfi ll and reference areas were lowerthan the standards of Thailand. The heavy metal concentrations in the sediment from thelandfi ll area were signifi cantly higher than those from the reference area, except for Mn.In L. fl ava and M. crenata from both areas, As, Pb and Cr concentrations were higher thanthe food standards of FAO/WHO. In the landfi ll area, the highest bioaccumulation factor(BAF) values for As (3.92 ± 0.80), Cd (3.23 ± 0.77), Pb (1.51 ± 0.08) and Mn (1.47 ± 0.46)were found in M. crenata. The highest BAF values for Cr (0.80 ± 0.60) and Zn (6.97 ± 0.47) werefound in L. flava. The genetic similarity values ranged from 0.56 - 0.99 in L. flavaand from 0.71 - 0.98 in M. crenata. This result suggested that the heavy metalconcentrations in the 2 aquatic plant species might be a factor in genetic diff erentiation.M. crenata might be better able than L. fl ava to endure the harsh conditions and adapt to survive in themunicipal landfi ll area. M. crenata is suggested for use in phytoremediation of As, Cd, Pb and Mn.
关键词：Limnocharis fl ava; Marsilea crenata; Heavy metal; ISSR marker; DNA change
