Heavy metal accumulation in rice plants. Effects on mineral nutrition and possible interaction of plant hormones
- Univ. of Valencia, Burjassot (Spain)
- Univ. of Jaume I, Castello (Spain)
As a consequence of anthropogenic activities there is a constant increase in water and soil pollution by heavy metals, which may have negative effect on plants. We have studied the effects of Cd and Ni treatments on mineral nutrition of rice plants. six days after germination. Cd (0.1 mM) or Ni (0.5 mM) was added to the nutrient solution where the plants were grown. After 10 days mineral element contents were analyzed by atomic absorption spectrophotometry after sample digestion with nitric acid (70[degrees]C 24 h) in erlenmeyer flasks. Cd-treated plants accumulated high quantities of this metal (2.28 mg/g DW, 30 fold the value found in controls), and most of it remained in the root (66% of total). A great increase in Ni contents was also observed in Ni-treated plants (3.06 mg/g DW, 28 fold higher than in controls). However, contrary to Cd, Ni accumulated preferentially in shoots (81% of total). Addition of ABA or GA[sub 3] (5 mg/l) to the nutrient solution together with the heavy metal, did not affect Cd uptake by the plants but caused a significant reduction in Ni accumulation in the shoots (60%). In both, Cd- and Ni-treated plants, the uptake of divalent cations (Ca[sup 2][sup +], Mg[sup 2][sup +]) decreased more than 50% with respect to controls. This effect was not modified by hormonal applications, though a trend to reverse the decrease in Ca[sup 2][sup +] caused by Ni was observed.
- OSTI ID:
- 6246126
- Report Number(s):
- CONF-9307119-; CODEN: PLPHAY; CNN: PB91/0645
- Journal Information:
- Plant Physiology; (United States), Vol. 102:1; Conference: 1993 joint annual meeting of the American Society of Plant Physiologists (ASPP) and the Canadian Society of Plant Physiologists (CSPP), Minneapolis, MN (United States), 31 Jul - 4 Aug 1993; ISSN 0032-0889
- Country of Publication:
- United States
- Language:
- English
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CADMIUM
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