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Arsenate Causes Differential Acute Toxicity to Two P-deprived Genotypes of Rice Seedlings ( Oryza sativa L.)

Arsenate Causes Differential Acute Toxicity to Two P-deprived Genotypes of Rice Seedlings ( Oryza... Significant genotypic difference in response to arsenate toxicity in rice ( Oryza sativa ) was investigated in root elongation, arsenate uptake kinetics, physiological and biochemical response and arsenic (As) speciation. Uptake kinetics data showed that P-deprived genotype 94D-54 had a little higher As uptake than P-deprived 94D-64, but the difference was not large enough to cause acute toxicity in P-deprived 94D-54. There was no difference in tissue P concentrations between the two genotypes under P deficient conditions. In addition, arsenic speciation in plant tissues (using high performance liquid chromatography-inductively coupled plasma mass spectrometry) was not different between P pretreatments and between genotypes. P-deprived genotype 94D-54 suffered much higher stress induced by arsenate toxicity than P-deprived genotype 94D-64, in terms of lipid peroxidation, tissue H 2 O 2 concentrations and exosmosis of K, P and As. However, P-deprived 94D-54 also had higher overproduction of enzymatic antioxidants (with higher GPX, SOD, CAT) and NPT (non-protein thiols) than P-deprived 94D-64. It appeared that, the higher sensitivity of P-deprived 94D-54 to arsenate toxicity might cause the overproduction of NPT, thus leading to the depletion of GSH and to the accumulation of H 2 O 2 . The differential sensitivity of the two genotypes has major implications for breeding rice for As affected paddy soil. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant and Soil Springer Journals

Arsenate Causes Differential Acute Toxicity to Two P-deprived Genotypes of Rice Seedlings ( Oryza sativa L.)

Geng, C.; Zhu, Y.; Hu, Y.; Williams, P.; Meharg, A.
Plant and Soil , Volume 279 (1) – Jan 1, 2006
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References (37)

Publisher
Springer Journals
Copyright
Copyright © 2006 by Springer
Subject
Life Sciences; Ecology; Plant Sciences; Plant Physiology; Soil Science & Conservation
ISSN
0032-079X
eISSN
1573-5036
DOI
10.1007/s11104-005-1813-7
Publisher site
See Article on Publisher Site

Abstract

Significant genotypic difference in response to arsenate toxicity in rice ( Oryza sativa ) was investigated in root elongation, arsenate uptake kinetics, physiological and biochemical response and arsenic (As) speciation. Uptake kinetics data showed that P-deprived genotype 94D-54 had a little higher As uptake than P-deprived 94D-64, but the difference was not large enough to cause acute toxicity in P-deprived 94D-54. There was no difference in tissue P concentrations between the two genotypes under P deficient conditions. In addition, arsenic speciation in plant tissues (using high performance liquid chromatography-inductively coupled plasma mass spectrometry) was not different between P pretreatments and between genotypes. P-deprived genotype 94D-54 suffered much higher stress induced by arsenate toxicity than P-deprived genotype 94D-64, in terms of lipid peroxidation, tissue H 2 O 2 concentrations and exosmosis of K, P and As. However, P-deprived 94D-54 also had higher overproduction of enzymatic antioxidants (with higher GPX, SOD, CAT) and NPT (non-protein thiols) than P-deprived 94D-64. It appeared that, the higher sensitivity of P-deprived 94D-54 to arsenate toxicity might cause the overproduction of NPT, thus leading to the depletion of GSH and to the accumulation of H 2 O 2 . The differential sensitivity of the two genotypes has major implications for breeding rice for As affected paddy soil.

Journal

Plant and Soil – Springer Journals

Published: Jan 1, 2006

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