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

Geng, C. N. and Zhu, Y.G. and Hu, Y. and Williams, Paul and Meharg, A. A. (2006) Arsenate Causes Differential Acute Toxicity to Two P-deprived Genotypes of Rice Seedlings ( Oryza sativa L.). Plant and Soil, 279 (1-2). pp. 332-342. ISSN 0032-079X

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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 chromatographyinductively 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 H2O2 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 H2O2. The differential sensitivity of the two genotypes has major implications for breeding rice for As affected paddy soil.

Item Type: Journal Article
Journal or Publication Title: Plant and Soil
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 53832
Deposited By: ep_importer_pure
Deposited On: 27 Apr 2012 09:30
Refereed?: Yes
Published?: Published
Last Modified: 19 Jun 2018 03:12
Identification Number:

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