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Using plants against soils contaminated with arsenic
Date:11/16/2010

This release is available in German.

Two essential genes that control the accumulation and detoxification of arsenic in plant cells have been identified. This discovery is the fruit of an international collaboration involving laboratories in Switzerland, South Korea and the United States, with the participation of members of the National Centre of Competence in Research (NCCR) Plant Survival. The results presented are a promising basis for reducing the accumulation of arsenic in crops from regions in Asia that are polluted by this toxic metalloid, as well as for the cleanup of soils contaminated by heavy metals. The findings are published this week in the prestigious journal PNAS.

The sinking of tubewells in Southeast Asia as well as mining in regions such as China, Thailand, and the United States, are the cause that arsenic concentrations in water often exceed the World Health Organization (WHO) limit of 10 μg/L, the value above which health problems start to occur. Tens of millions of people are exposed to this risk by drinking contaminated water or by ingesting cereal crops cultivated in polluted soils. A long lasting exposure to this highly toxic metalloid could affect the gastrointestinal transit, the kidneys, the liver, the lungs, the skin and increases the risk of cancer. In Bangladesh, it is estimated that 25 million people drink water that contains more than 50 μg/L of arsenic and that two million of them risk of dying from cancer caused by this toxic substance.

Plants offer a way for toxic metals to enter the food chain. We know, for example, that arsenic is stored within rice grains, which, in regions polluted with this toxic metalloid, constitutes a danger for the population whose diet depends to a great extent on this cereal.

Arsenic or cadmium in soils is transported to plant cells and stored in compartmen
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Contact: Enrico Martinoia
enrico.martinoia@botinst.uzh.ch
41-446-348-222
University of Zurich
Source:Eurekalert

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