All the developments of drought-resistance and higher yields and all the rest have been done verbally so far.

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"We're looking for genes that could improve taste or color" and plants with good drought resistance, said botanist Sarada Krishnan, Denver Botanic Gardens director of horticulture.

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These technologies increase crop yields and offer a variety of crop-specific benefits, including better nutrients, improved resistance to pests, drought-resistance and other characteristics that allow farmers to grow more with less environmental impact.

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Simon Best, former head of plant science at Zeneca, looks forward to the day when molecular switches might be so sophisticated that the process of infection or drought will itself be enough to turn on a genetically engineered resistance gene.

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