Do iron plaque and genotypes affect arsenate uptake and translocation by rice seedlings (Oryza sativa L.) grown in solution culture?

The effects of Fe concentrations in the pretreatment solution on the induction of plaque and the differences between genotypes on arsenate uptake by and translocation within rice seedlings grown in nutrient solution in the greenhouse were investigated. After iron plaque on rice roots was induced in...

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Bibliographic Details
Published in:Journal of experimental botany 2004-08, Vol.55 (403), p.1707-1713
Main Authors: Liu, W.J, Zhu, Y.G, Smith, F.A, Smith, S.E
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Analysis of Variance
arsenates
Arsenates - analysis
Arsenates - metabolism
Arsenic
Arsenic translocation
arsenic uptake
Biological and medical sciences
Biological Transport
Economic plant physiology
Fundamental and applied biological sciences. Psychology
Genotype
Genotypes
Groundwater
Iron
Iron - analysis
Iron - pharmacology
iron plaque
Mineral nutrition
nutrient solutions
Nutrition. Photosynthesis. Respiration. Metabolism
Oryza - genetics
Oryza - metabolism
Oryza sativa
Plant roots
Plant Roots - chemistry
Plant Roots - metabolism
Plant Shoots - chemistry
Plant Shoots - metabolism
Plants
Pretreatment
Research Papers: Regulation of Growth, Development and Whole Organism Physiology
Rice
rice genotypes
roots
Seedlings
Seedlings - chemistry
Seedlings - growth & development
Seedlings - metabolism
shoots
Soil pollution
soilless culture
translocation (plant physiology)
uptake mechanisms
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Summary:The effects of Fe concentrations in the pretreatment solution on the induction of plaque and the differences between genotypes on arsenate uptake by and translocation within rice seedlings grown in nutrient solution in the greenhouse were investigated. After iron plaque on rice roots was induced in solutions containing 20, 40, 60, 80, and 100 mg Fe2+ I-1, seedlings were transplanted into nutrient solution with 0.5 mg As I-1. The formation of iron plaque was clearly visible as a reddish coating on the root surface after 12 h induction. Fe2+ concentrations in the pretreatment solution and 0.5 mg As I-1 in the treatment solutions did not significantly affect rice growth. There was a significant correlation between the concentrations of Fe and As in iron plaque on the root surface for the three genotypes. About 75-89% of total As was concentrated in iron plaque (DCB-extracts). There were no significant differences in As concentrations in the roots between the three genotypes; however, As concentrations in shoots differed significantly between them. Arsenic concentrations in shoots were positively correlated with iron concentrations in the shoots. The results suggest that iron plaque may act as a 'buffer' for As in the rhizosphere.
ISSN:0022-0957
1460-2431
1460-2431
DOI:10.1093/jxb/erh205