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A methodology of genetic divergence analysis based on sample unit projection on two-dimensional space

Cosme Damião Cruz; José Marcelo Soriano Viana

Departamento de Biologia Geral, Universidade Federal de Viçosa, 36570-000 Viçosa, MG, Brasil. Send correspondence to C.D.C.

ABSTRACT

A methodology for the assessment of the dissimilarity among sample units (varieties, lines, etc.) in dispersion graph was presented. The coordinate of each unit was calculated from a dissimilarity matrix, adopting the criteria of minimizing the differences between the original distances calculated in the p-dimensional space (p > 2) and the two dimensional space distances. A comparison was made between the proposed methodology, canonic variables and principal components techniques. It was slightly superior in expressing genetic dissimilarity among cultivars.

Keywords: genetic divergence; sample unit projection; two-dimensional space.

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