The Russian botanist and geneticist Nikolai Ivanovich Vavilov (1887-1943) served early as a professor at the Leningrad Agricultural Institute. In 1927 he presented his so-called "gene centre theory" based on impressions gained during worldwide travels. This theory assumes that there are centres on earth with a considerable diversity of cultivated plants. He pointed out that these gene centres largely coincide with the areas where agriculture and the first advanced civilisations originated. Today, the eight "classical" gene centres are still considered to be Central America, parts of Peru and Chile, the Mediterranean region and parts of the Middle East, India, as well as former Indochina and southern China.
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