The role of the root cell wall in the heavy metal tolerance ofAthyrium yokoscense |
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Authors: | H Nishizono H Ichikawa S Suziki F Ishii |
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Institution: | (1) Faculty of Pharmaceutical Sciences, Science, University of Tokyo, Tokyo, Japan;(2) Chemical Laboratory, Takasaki College of Economics, Takasaki-city, Gunma, Japan |
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Abstract: | Cells of the roots ofA. yokoscense growing on metalliferous habitats were fractionated into their cell wall and cytoplasmic components. About 70–90% of the
total copper, zinc and cadmium was located in the cell wall. Copper had a markedly greater affinity for the cell wall than
zinc and cadmium, and was prevented from entering the cytoplasm. A large proportion of these heavy metals in the cell wall
were exchanged as ions. The capacity of the cell wall for exchanging metal ions inA. yokoscense was higher than in other plants growing on metalliferous habitats. However, compared with different ferns unable to grow
on metalliferous habitats, this capacity was not unique toA. yokoscense. Consequetly, the root cell wall ofA. yokoscense is considered to be an important site of metal ion storage and may play the role of an excretory organ for heavy metals.
On the other hand, as proportion of the heavy metls was transported to the cytoplasm, where the metal content was much higher
than the average for normal ferns. This would suggest thatA. yokoscense has another metabolic mechanism related to metal tolerance. |
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Keywords: | Athyrium yokoscense cell wall cytoplasm exchange capacity heavy metal tolerance metalliferous habitats |
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