New Rice Strains Resist Arsenic, May Ease Shortage

More than 80 percent of the world's population depends on rice as a staple food, but production is dropping in the rice paddies of Bangladesh, parts of India, and South and East Asia due to toxic levels of arsenic in the topsoil. Om Parkash of the University of Massachusetts-Amherst leads a research team that uses genetic engineering to produce rice plants that block the uptake of arsenic, which could increase production of this valuable crop and provide safer food supplies for millions.

"By increasing the activity of certain genes, we can create strains of rice that are highly resistant to arsenic and other toxic metals," says Parkash, a professor of plant, soil, and insect sciences. "Rice plants modified in this way accumulate several-fold less arsenic in their above-ground tissues, and produce six to seven times more biomass, making the rice safer to eat and more productive." This could help alleviate the current worldwide rice shortage.

Deep tube wells that provide drinking water in Bangladesh and other countries are producing water with naturally occurring levels of arsenic that greatly exceed safe limits. Groundwater is then being used to irrigate rice paddies, and this irrigation is causing a toxic buildup of arsenic in topsoils, reducing the amount of rice that can be produced.

According to Parkash, arsenic builds up in all parts of the plant, including the rice grains used for food, creating health problems in hundreds of thousands of people, including several forms of cancer. Arsenic is present in the rice straw used as animal fodder, causing arsenic to enter the food chain in dairy products and meat and affecting the health of animals.

"Already on the Indian subcontinent, particularly in Bangladesh and West Bengal, there are more than 300,000 people who have developed cancer from arsenic poisoning by drinking contaminated water and eating contaminated food," says Parkash. "The World Health Organization has dubbed this one of the major environmental disasters in human history."

Parkash is working with the university's Office of Commercial Ventures and Intellectual Property and several interested companies to bring this technology to the marketplace.

This research is funded through the Massachusetts Technology Transfer Center from the Office of the President of the University of Massachusetts.

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