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Arsenate uptake and translocation in seedlings of two genotypes of rice is affected by external phosphate concentrations
Geng, C.-N.; Zhu, Y.-G.; Liu, W.-J.; Smith, S.E. (2005). Arsenate uptake and translocation in seedlings of two genotypes of rice is affected by external phosphate concentrations. Aquat. Bot. 83(4): 321-331. dx.doi.org/10.1016/j.aquabot.2005.07.003
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770, more
Peer reviewed article  

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Keywords
    Phosphates; Uptake; Fresh water

Authors  Top 
  • Geng, C.-N.
  • Zhu, Y.-G.
  • Liu, W.-J.
  • Smith, S.E.

Abstract
    Two genotypes of rice (Oryza sativa L.), 94D-54 and 94D-64 were used to investigate the formation of iron plaque controlled by different phosphorus (P) concentrations and the effect of iron plaque on arsenate uptake in a hydroponic experiment. External P concentrations from 10 to 50 μM caused a marked decrease in dithionite-citrate-bicarbonate (DCB)–Fe concentrations for both genotypes, but further increases from 50 to 300 μM only resulted in small decrease. Arsenic (As) concentrations in DCB-extracts were determined by the amounts of iron plaque and the adsorption capacity of As by iron plaque, and both controlled by external P concentrations. At 10 μM external P, genotype 94D-54 had higher Fe, As and P concentrations in DCB-extracts than genotype 94D-64, but the difference disappeared with increasing P concentrations. Increasing P concentrations decreased the percentages of As distributed in iron plaque from around 70 to 10%, and increased the percentages of As in roots and shoots gradually from around 20 to 60% for toots and from 5 to nearly 35% for shoots, respectively. Moreover, P concentration increased the molar ratio of shoot-to-root As, from 0.05 to nearly 0.2, indicating P concentration may promote As translocation from roots to shoots.

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