Direct evidence showing the effect of root surface iron plaque on arsenite and arsenate uptake into rice (Oryza sativa L.) roots

Z. chen, Y. G. zhu, W. J. liu, Andrew Alexander Meharg

Research output: Contribution to journalArticle

202 Citations (Scopus)

Abstract

The present study aimed to investigate the effects of root surface iron plaque on the uptake kinetics of arsenite and arsenate by excised roots of rice (Oryza sativa) seedlings.

The results demonstrated that the presence of iron plaque enhanced arsenite and decreased arsenate uptake.

Arsenite and arsenate uptake kinetics were adequately fitted by the Michaelis-Menten function in the absence of plaque, but produced poor fits to this function in the presence of plaque.

Phosphate in the uptake solution did not have a significant effect on arsenite uptake irrespective of the presence of iron plaque; however phosphate had a significant effect on arsenate uptake. Without iron plaque, phosphate inhibited arsenate uptake. The presence of iron plaque diminished the effect of phosphate on arsenate uptake, possibly through a combined effect of arsenate desorption from iron plaque.

Original languageEnglish
Pages (from-to)91-97
Number of pages6
JournalNew Phytologist
Volume165
DOIs
Publication statusPublished - 2005

Keywords

  • arsenic
  • iron plaque
  • Oryza sativa (rice)
  • phosphate
  • rhizosphere
  • uptake kinetics
  • FLOODED CONDITIONS
  • SOLUTION CULTURE
  • ASTER-TRIPOLIUM
  • SOIL SOLUTION
  • PLANTS
  • L.
  • ACCUMULATION
  • BANGLADESH
  • METABOLISM
  • MORPHOLOGY

Cite this

Direct evidence showing the effect of root surface iron plaque on arsenite and arsenate uptake into rice (Oryza sativa L.) roots. / chen, Z.; zhu, Y. G.; liu, W. J.; Meharg, Andrew Alexander.

In: New Phytologist, Vol. 165, 2005, p. 91-97.

Research output: Contribution to journalArticle

chen, Z. ; zhu, Y. G. ; liu, W. J. ; Meharg, Andrew Alexander. / Direct evidence showing the effect of root surface iron plaque on arsenite and arsenate uptake into rice (Oryza sativa L.) roots. In: New Phytologist. 2005 ; Vol. 165. pp. 91-97.
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AU - Meharg, Andrew Alexander

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AB - The present study aimed to investigate the effects of root surface iron plaque on the uptake kinetics of arsenite and arsenate by excised roots of rice (Oryza sativa) seedlings.The results demonstrated that the presence of iron plaque enhanced arsenite and decreased arsenate uptake.Arsenite and arsenate uptake kinetics were adequately fitted by the Michaelis-Menten function in the absence of plaque, but produced poor fits to this function in the presence of plaque.Phosphate in the uptake solution did not have a significant effect on arsenite uptake irrespective of the presence of iron plaque; however phosphate had a significant effect on arsenate uptake. Without iron plaque, phosphate inhibited arsenate uptake. The presence of iron plaque diminished the effect of phosphate on arsenate uptake, possibly through a combined effect of arsenate desorption from iron plaque.

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KW - iron plaque

KW - Oryza sativa (rice)

KW - phosphate

KW - rhizosphere

KW - uptake kinetics

KW - FLOODED CONDITIONS

KW - SOLUTION CULTURE

KW - ASTER-TRIPOLIUM

KW - SOIL SOLUTION

KW - PLANTS

KW - L.

KW - ACCUMULATION

KW - BANGLADESH

KW - METABOLISM

KW - MORPHOLOGY

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DO - 10.1111/j.1469-8137.2004.01241.x

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SP - 91

EP - 97

JO - New Phytologist

JF - New Phytologist

SN - 0028-646X

ER -