Pb and Cd uptake in rice roots
SCIE
SCOPUS
- Title
- Pb and Cd uptake in rice roots
- Authors
- Kim, YY; Yang, YY; Lee, Y
- Date Issued
- 2002-11
- Publisher
- MUNKSGAARD INT PUBL LTD
- Abstract
- Pb and Cd are heavy metal pollutants that inhibit plant growth. Using a cultivated rice variety (Dongjin, Oryza sativa L.), we studied how the transport and toxicity of Pb2+ and Cd2+ are affected by the presence of K+ , Ca2+ or Mg2+ . K+ had a little effect on uptake or toxicity of Pb2+ and Cd2+ . Ca2+ or Mg2+ blocked both Cd2+ transport into rice roots and Cd2+ toxicity on root growth, which suggested that their detoxification effect is directly related to their blocking of entry of the heavy metals. Similarly, Ca2+ blocked both Pb2+ transport into the root and Pb2+ toxicity on root growth. The protective effect of Ca2+ on Pb2+ toxicity may be related to its inhibition of the heavy metal accumulation in the root tip, a potential target site of Pb2+ toxicity. Mg2+ did not ameliorate the Pb2+ toxicity on root growth as much as Ca2+ did, although it decreased Pb2+ uptake into roots similarly as Ca2+ did. These results suggest that the protective effect of Ca2+ on Pb2+ toxicity may involve multiple mechanisms including competition at the entry level, and that Pb2+ and Cd2+ may compete with divalent cations for transport into roots of rice plants.
- Keywords
- CALCIUM CHANNELS; TRANSGENIC PLANTS; TOLERANCE; BINDING; CADMIUM; CELLS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/18869
- DOI
- 10.1034/j.1399-3054.2002.1160312.x
- ISSN
- 0031-9317
- Article Type
- Article
- Citation
- PHYSIOLOGIA PLANTARUM, vol. 116, no. 3, page. 368 - 372, 2002-11
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