Alex Rice Videos : Steps Toward Drought-Resistant Crops, 'Designer' Rice

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Steps Toward Drought-Resistant Crops, 'Designer' Rice

Editor's note: "Coarse" is misspelled as "course" in the captions. This is the VOA Special English Agriculture Report , from voaspecialenglish.com | http A discovery in a laboratory could help lead to new generation of drought-resistant crops. Drought conditions cause plants to produce a stress hormone called abscisic acid. This chemical activates a set of protein molecules called receptors. These receptors then activate a series of changes to help the plant survive. The natural reaction of the receptors is to close so-called guard cells on and inside the leaves. That closure decreases water loss and stops the plant from growing to save water during a drought. Researchers say they have discovered a way to "supercharge," or increase, this reaction. Sean Cutler at the University of California, Riverside, led the team. The scientists engineered abscisic acid receptors that can be turned on at will and stay on. They tested hundreds of versions of engineered receptor genes until they found ones that worked right together. The team worked with Arabidopsis, a plant often used in experiments. The results recently appeared in the Proceedings of the National Academy of Sciences. Professor Cutler says testing the new receptors in the field may take several years. He also points out that drought is not the only cause of plant stress. What would be stressful for a crop plant is not stressful for a cactus, for example, because the cactus has evolved to live in dry deserts. In another ...

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