How does Thlaspi goesingense accumulate heavy metals?

P. Kabouw, Helmuth Sieghardt

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    Despite their great future potential, a multitude of questions remain to be addressed before hyperaceumulators can be used to clean up contaminated sites. We used a scanning electron microscope and light microscopy to address the question how Thlaspi goesingense accumulates metals. Hyperaccumulation of nickel by T. goesingense was confirmed: the recorded concentration was ten times beyond the threshold that defines a nickel hypcraccumulator. The pathogen/herbivore defence hypothesis can indirectly be confirmed because cuticular striations increased when the nickel concentration decreased. The large, elongated epidermis cells in T. goesingense indicate that metals arc sequestered and immobilized because these cells correlated with elevated
    nickel concentrations. These cells are less frequently encountered in T. arvense, a nonhyperaccumulator. Exceptions were recorded in the leaves of the inflorescence axis: the nickel concentration here was relatively high but only a few elongated cells were present. The high amount of nickel and zinc in the plant confirms the metal tolerance of T. goesingense. The disposal-from-the-Plant-Body Theory can also be confirmed because the leaves of the inflorescent axis, which are lost after flowering, accumulated high amounts of nickel. Detoxification is by disposal of noncssential plant organs. Other mechanisms of disposal are unlikely because no trichomes or other adaptations were recorded.
    Originele taal-2Engels
    Pagina's (van-tot)107-117
    TijdschriftVerhandlungen Der Zoologisch-Botanischen Gesellschaft in Österreich
    Volume144
    StatusGepubliceerd - 2007

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