Israr Mohd, Sahi Shivendra V
Department of Biology, Western Kentucky University, Bowling Green, KY 42101, USA.
Environ Pollut. 2008 May;153(1):29-36. doi: 10.1016/j.envpol.2007.12.029. Epub 2008 Feb 13.
Lead (Pb) accumulation in Sesbania drummondii shoots was enhanced by 654 and 415% in the presence of 100 microM IAA and 100 microM NAA, respectively, compared to control plants (Pb alone). However, when IAA or NAA was added along with EDTA, Pb accumulation further increased in shoots by 1349% and 1252%, respectively. Scanning electron microscopic observations revealed that Pb particles in both leaf and stem of Pb+EDTA+IAA and Pb+EDTA+NAA treated plants were concentrated in the region of vascular bundles. In root tissue, Pb particles were present between epidermis to stele region. Plant growth in both treatments (Pb+100 microM IAA and Pb+100 microM NAA) was comparable to control plants; however, it was significantly inhibited in the treatments containing Pb+EDTA and EDTA at concentrations of 10 microM of IAA or NAA. Moreover, the photosynthetic efficiency and strength of the treated plants were not affected in the presence of IAA or NAA and EDTA.
与对照植株（仅含铅）相比，在100微摩尔/升吲哚乙酸（IAA）和100微摩尔/升萘乙酸（NAA）存在的情况下，德拉蒙德田菁茎中铅（Pb）的积累分别提高了654%和415%。然而，当IAA或NAA与乙二胺四乙酸（EDTA）一起添加时，茎中铅的积累分别进一步增加了1349%和1252%。扫描电子显微镜观察表明，经Pb+EDTA+IAA和Pb+EDTA+NAA处理的植株叶片和茎中的铅颗粒都集中在维管束区域。在根组织中，铅颗粒存在于表皮到中柱区域之间。两种处理（Pb+100微摩尔/升IAA和Pb+100微摩尔/升NAA）下的植株生长与对照植株相当；然而，在含有10微摩尔/升IAA或NAA的Pb+EDTA和EDTA处理中，植株生长受到显著抑制。此外，在IAA或NAA以及EDTA存在的情况下，处理过的植株的光合效率和强度不受影响。
