What significance does N. I. Vavilov’s doctrine on the centers of diversity and origin of cultivated plants have for breeding?

A great contribution to the study of centers of domestication of cultivated plants was made by N. I, Vavilov. In 1920-1940 as a result of numerous expeditions, he studied the geographical distribution of about 1600 varieties of cultivated plants of the entire globe and established their centers of diversity and origin.

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