Accumulation of heavy metals in epidermal glands of the waterlily (Nymphaeaceae) |
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Authors: | Noa Lavid Zahava Barkay Elisha Tel-Or |
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Affiliation: | (1) Department of Agricultural Botany, The Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel, IL;(2) Wolfson Applied Materials Research Center, Tel-Aviv University, Israel, IL |
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Abstract: | ![]() This study investigates the anatomical aspects of heavy-metal accumulation in the waterlily (Nymphaea `Aurora', Nymphaeaceae). Epidermal glands were identified by light microscopy on the abaxial side of the leaf laminae and on the epidermis of the rhizome; glandular trichomes were observed in the petiole epidermis. Glands were not observed in the roots. Accumulation of heavy metals in these glands was monitored using a scanning electron microscope equipped for energy-dispersive spectroscopy. Further experiments showed maximal cadmium and calcium accumulation in the mature leaf lamina in daylight, and this accumulation was inhibited by the herbicide 3-(3′,4′-dichlorophenyl)-1,1-dimethylurea. These results suggest that, in Nymphaea, heavy metals are accumulated primarily in association with glands found in plant organs that have direct contact with water or mud. Deposition and storage of heavy metals by these glands may represent a stage in the sequestration and detoxification of the metals. Our results raise the possibility of utilizing waterlilies for the removal of heavy metals from polluted environments. Received: 29 April 2000 / Accepted: 8 June 2000 |
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Keywords: | : Cadmium accumulation Glandular trichome Heavy metal Nymphaea (Cd accumulation) Phytoremediation |
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