Crop improveent: breeding and genetic engineering

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Abstract
Successful plant-breeding programmes are large in scale. The major constraint to plant breeders at the present time is the amount of work that they and their helpers can accomplish. A variety of modern technologies-mechanical, electronic and genetic—can increase their effectiveness in ways that can be easily demonstrated. However, genetic engineering, as well as providing new tools like the other technologies, should one day relieve conceptual constraints by allowing directed genetic changes that could eventually alter the character of the crops we grow. The time-scale for these changes is likely to be measured in decades, because much needs to be done before blueprints for crop-plant genetic engineers to follow can be formulated.

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