Solar radiation causes spontaneous mutations. With radiation, scientists can increase the rate of mutations. Although the results are unpredictable and frequently not useful, some mutations result in larger crop yields, disease resistant crops, and better tasting and more nutritious crops.
The creation of red grapefruit
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FAO Joint FAO/IAEA. Mutant Variety Database
Parry, Martin A and others. Mutation discovery for crop improvement. Experimental Botany, June 2009.