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1 2006

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Metals absorbed by two aquatic plants and changes in their phenolic compounds

Zobel A. M., Sandstrom T., Nighswander J. E., Dudka S.

Inżynieria Ekologiczna

2006

Nr 16

70-75

Two aquatic macrophytes: Eriacaulon septangulare and Lobelia dortman-na, which are the most abundant in oligotrophic acid waters, were tested for their response to different pH, and Al3+ and Pb2+ concentrations. Both isoetids were tolerant down to the lowest pH tested (3.5), showing mitotic divisions after one week, and increased concentrations of phenolics in the shoot apex. Both plants showed mitotic activity after one month in 300 mg Al3+/L, and after lead treatment divisions up to 72% of the control were still observed. For L. dortmanna there was a negative linear relationship (r = -0.97) between the length of the inflorescence stem and the Al3+ concentration. Aluminum was found in the stomata associated with the hydatode in L. dortmanna, and in the leaf tip of E. septanglare. In the roots it was found in epidermal tissue of E. septangulare, and the cell wall of the epidermis, with only occasional cell flooding in L. dortmanna.