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Genetically engineered tomato plant grows in salty water

A genetically engineered tomato plant that thrives in salty irrigation water and may hold the key to one of agriculture's greatest dilemmas has been developed by plant biologists at the University of California, Davis, and the University of Toronto.

As the first truly salt-tolerant crop, these tomatoes offer hope that other crops can also be genetically modified for planting in many areas of the world that have salty irrigation water and salt-damaged soils.

"Since environmental stress due to salinity is one of the most serious factors limiting the productivity of crops, this innovation will have significant implications for agriculture worldwide," said Eduardo Blumwald, who led the research team that discovered the salt-tolerance gene. The research, much of which was done at the University of Toronto, continues in the UC Davis Department of Pomology.

The most recent findings by Blumwald and Hong-Xia Zhang, a postdoctoral fellow at the University of Toronto, will be published July 31 in the August issue of the journal Nature Biotechnology.

Worldwide an estimated 24.7 million acres (10 million hectares) -- about one-fifth the area of California -- of once agriculturally productive land are being lost annually because of irrigation-induced salinity, according to the U.S. Department of Agriculture. Crop production is limited by salinity on 40 percent of the world's irrigated land and on 25 percent of irrigated land in the United States.

This progressive loss of farmable land is on a collision course with the expanding global population, which over the next 30 years is expected to require an increase in food production of 20 percent in developed countries and 60 percent in developing nations.

Although scientists have been trying to develop salt-tolerant crop varieties using selective breeding techniques throughout the past century, none of those efforts has proven successful.

Crop irrigation is an age-old practice
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Contact: Patricia Bailey
pjbailey@ucdavis.edu
530-752-9843
University of California - Davis
30-Jul-2001


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