STP1115

    Photoinduced Toxicity of Polycyclic Aromatic Hydrocarbons to the Higher Plant Lemna Gibba L. G-3

    Published: Jan 1991


      Format Pages Price  
    PDF (180K) 8 $25   ADD TO CART
    Complete Source PDF (6.8M) 8 $104   ADD TO CART


    Abstract

    Polycyclic aromatic hydrocarbons (PAHs) are known to exhibit photoinduced toxicity to animals and microorganisms, especially in the presence of ultraviolet (UV) irradiation. Since higher plants readily assimilate PAHs from the environment, and since they cannot avoid UV radiation (a natural component of solar radiation), PAHs have the potential to be a potent phytotoxicant. We have begun to assess the photoinduced toxicity of two PAHs (anthracene and phenanthrene) to the higher plant Lemna gibba. In the presence of low-intensity visible light (60 μmol m-2 s-1, 400 nm to 700 nm), anthracene and phenanthrene were found to be essentially nontoxic. However, both compounds were highly toxic to Lemna in low levels of simulated solar radiation [visible light, 30 μmol m-2 s-1; UVA (320 nm to 400 nm), 4 μmol m-2 s-1; UVB (280 nm to 320 nm), 0.6 μmol m-2 s-1]. Furthermore, in the absence of plant tissue, anthracene and phenanthrene were chemically modified by simulated solar radiation. These photomodified PAHs exhibited toxicity in visible light and increased toxicity in simulated solar radiation.

    Keywords:

    anthracene, phenanthrene, PAH, organic pollutant, phototoxicity, phytotoxicity, UV radiation, solar radiation, aquatic toxicology, duckweed


    Author Information:

    Huang, X-D
    Visiting scientist, associate professor, and assistant professor, University of Waterloo, Waterloo, Ontario

    Dixon, DG
    Visiting scientist, associate professor, and assistant professor, University of Waterloo, Waterloo, Ontario

    Greenberg, BM
    Visiting scientist, associate professor, and assistant professor, University of Waterloo, Waterloo, Ontario


    Paper ID: STP19515S

    Committee/Subcommittee: E47.10

    DOI: 10.1520/STP19515S


    CrossRef ASTM International is a member of CrossRef.