Arsenic shoot-grain relationships in field grown rice cultivars

A - Papers appearing in refereed journals

Norton, G. J., Islam, M. R., Duan, G., Lei, M., Zhu, Y., Deacon, C. M., Moran, A. C., Islam, S., Zhao, F-J., Stroud, J. L., McGrath, S. P., Feldmann, J., Price, A. H. and Meharg, A. A. 2010. Arsenic shoot-grain relationships in field grown rice cultivars. Environmental Science & Technology. 44 (4), pp. 1471-1477.

AuthorsNorton, G. J., Islam, M. R., Duan, G., Lei, M., Zhu, Y., Deacon, C. M., Moran, A. C., Islam, S., Zhao, F-J., Stroud, J. L., McGrath, S. P., Feldmann, J., Price, A. H. and Meharg, A. A.
Abstract

Arsenic (As) accumulation in rice grains is a risk to human health. The mechanism of transfer of As from the shoot into the grain during grain filling is unknown at present. In this study As speciation in the shoot and grains at maturity were examined, and the relationships between phosphorus (P) and As, and silicon (Si) and As were established in a wide range of cultivars grown in As contaminated field trials in Bangladesh and China. No correlations were observed between shoot and grain speciation, with the inorganic form comprising 93.0−97.0% of As in the shoot and 63.0−83.7% in the grains. The percentage of dimethylarsinic acid (DMA) was between 1.4 and 6.6% in the shoot and 14.6 and 37.0% in the grains; however, the concentrations were comparable, ranging from 0.07 to 0.26 mg kg−1 in the shoots and 0.03 to 0.25 mg kg−1 in the grains. A positive correlation was observed between shoot As and shoot Si, however, no correlation was observed between shoot Si and grain As. A significant negative correlation was observed between shoot P and grain As concentrations. These results suggest that the translocation of As into the grain from the shoots is potentially using P rather than Si transport mechanisms. The findings also indicate that inorganic As and DMA translocation to the grain differ considerably.

Year of Publication2010
JournalEnvironmental Science & Technology
Journal citation44 (4), pp. 1471-1477
Digital Object Identifier (DOI)doi:10.1021/es902992d
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Department for International Development (DFID)
Funder project or codeSEF
Characterising genetic and soil induced variation in arsenic uptake, translocation and metabolism in rice to mitigate arsenic contamination in Asia
Trace element dynamics in soils and plant uptake
Soil protection and remediation
Publisher's version
Copyright license
Publisher copyright
Output statusPublished
Publication dates
Online20 Jan 2010
Publication process dates
Accepted05 Jan 2010
ISSN0013-936X
PublisherAmerican Chemical Society (ACS)

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