Arsenic accumulation in rice (Oryza sativa L.) is influenced by environment and genetic factors

Kumarathilaka, Prasanna and Seneweera, Saman and Meharg, Andrew and Bundschuh, Jochen (2018) Arsenic accumulation in rice (Oryza sativa L.) is influenced by environment and genetic factors. Science of the Total Environment, 642. pp. 485-496. ISSN 0048-9697


Arsenic (As) elevation in paddy soils will have a negative impact on both the yield and grain quality of rice (Oryza sativa L.). The mechanistic understanding of As uptake, translocation, and grain filling is an important aspect to
produce rice grains with low As concentrations through agronomical, physico-chemical, and breeding approaches.
A range of factors (i.e. physico-chemical, biological, and environmental) govern the speciation and mobility
of As in paddy soil-water systems. Major As uptake transporters in rice roots, such as phosphate and
aquaglyceroporins, assimilate both inorganic (As(III) and As(V)) and organic As (DMA(V) and MMA(V)) species
from the rice rhizosphere. A number of metabolic pathways (i.e. As (V) reduction, As(III) efflux, and As(III)-thiol
complexation and subsequent sequestration) are likely to play a key role in determining the translocation and
substantial accumulation of As species in rice tissues. The order of translocation efficiency (caryopsis-to-root)
for different As species in rice plants is comprehensively evaluated as follows: DMA(V) N MMA(V) N inorganic
As species. The loading patterns of both inorganic and organic As species into the rice grains are largely dependent on the genetic makeup and maturity stage of the rice plants together with environmental interactions. The knowledge of As metabolismin rice plants and how it is affected by plant genetics and environmental factors
would pave the way to develop adaptive strategies to minimize the accumulation of As in rice grains.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restricted access to Published version, in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying
Date Deposited: 12 Feb 2019 01:27
Last Modified: 14 Feb 2019 02:07
Uncontrolled Keywords: arsenic speciation; arsenic transporters; arsenic metabolism; detoxification; grain filling; arsenic toxicity
Fields of Research : 07 Agricultural and Veterinary Sciences > 0701 Agriculture, Land and Farm Management > 070108 Sustainable Agricultural Development
Socio-Economic Objective: B Economic Development > 82 Plant Production and Plant Primary Products > 8204 Summer Grains and Oilseeds > 820402 Rice
Identification Number or DOI: 10.1016/j.scitotenv.2018.06.030

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