Impact of iron plaque on arsenic uptake and speciation in rice (Oryza sativa L.) along plant development.
(2012) 9th International Phytotechnology Society Conference — Location: Hasselt, Belgium (11.September.2012)
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- Abstract
- Rice (Oryza sativa) is a staple crop for over half of the world’s population. In numerous areas of South and South-east Asia, soils and aquifers are arsenic contaminated leading to a potential health risk to populations due to As accumulation in rice. In most As-affected areas of South and South-east Asia, groundwater is rich in iron. Excess of both elements are serious threat to sustainable agriculture, in relation to a decrease of rice yield and a contamination of rice grains by toxic As. Nevertheless, the ability of rice species to carry oxygen from the air down its stem through aerenchyma and discharge it through its roots, creates an oxidised zone around individual roots in which Fe is oxidised to the Fe(III) state and forms a coating called “iron plaque”. This Fe plaque may retain As and reduces it disponibility for the plant. We aimed to investigate the impact of combined As and Fe stresses on rice growth and yield and study the influence of the Fe plaque on As uptake and speciation. Twenty five days old rice seedlings were exposed to As (V) (50mM and 100mM), Fe(II) (125 ppm) or combined treatments until plant maturation. The presence of Fe allowed the development of a Fe plaque on the rice roots that limited the As accumulation and modified its speciation in the different plant organs. Combined stresses also significantly reduced the plant yield and affected plant nutrition.
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Quinet, M., Vromman, D., Sommer, L., De Vreese, O., Šlejkovec, Z., & Lutts, S. (2012). Impact of iron plaque on arsenic uptake and speciation in rice (Oryza sativa L.) along plant development. 9th International Phytotechnology Society Conference, Hasselt, Belgium. https://hdl.handle.net/2078.5/206994