Triangle of U
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The Triangle of U is a theory about the evolution and relationships between members of the plant genus Brassica. It says that the genomes of three ancestral species of Brassica combined to create three of the common contemporary vegetables and oilseed crop species. The theory has since been confirmed by studies of DNA and proteins. The theory was first published in 1935 by Woo Jang-choon, a Korean botanist who was working in Japan (where his name was transliterated as "Nagaharu U"). Woo made synthetic hybrids between the diploid and tetraploid species and examined how the chromosomes paired in…mehr

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The Triangle of U is a theory about the evolution and relationships between members of the plant genus Brassica. It says that the genomes of three ancestral species of Brassica combined to create three of the common contemporary vegetables and oilseed crop species. The theory has since been confirmed by studies of DNA and proteins. The theory was first published in 1935 by Woo Jang-choon, a Korean botanist who was working in Japan (where his name was transliterated as "Nagaharu U"). Woo made synthetic hybrids between the diploid and tetraploid species and examined how the chromosomes paired in the resulting triploids. His work was influenced by work by Kihara on the origin of bread or hexaploid wheat and its relationship to its diploid ancestors. The theory can be illustrated by the triangular diagram at right.