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Revista Facultad Nacional de Agronomía Medellín

Print version ISSN 0304-2847

Abstract

CORREA LONDONO, Guillermo; LAVALETT ONATE, Lelia Leonor; GALINDO VILLARDON, María Purificación  and  AFANADOR KAFURI, Lucía. USE OF MULTIVARIATE METHODS FOR GROUPING STRAINS OF Colletotrichum spp. BASED ON CULTURAL AND MORPHOLOGICAL CHARACTERS. Rev. Fac. Nac. Agron. Medellín [online]. 2007, vol.60, n.1, pp.3671-3690. ISSN 0304-2847.

Fifteen cultural and morphological characteristics, with a mix of quantitative and qualitative variables, were evaluated on 58 strains of Colletotrichum spp. repeated four times. Using Principal Coordinates Analysis (PCOA), based on Gower's similarity coefficient, a grouping was obtained. The two first dimensions of PCOA allowed the perfect discrimination of three big groups: the first dimension separated Colletotrichum gloeosporioides and its teleomorph Glomerella cingulata from C. dematium; the second dimension discriminated between C. gloeosporioides and its teleomorph G. cingulata. By analyzing simultaneously the first three factorial axis, 21 minor groups were detected. In order to characterize the groups, a Biplot representation of the groups and variables contingency table was used. Relative frequencies to the size of the groups were used to avoid the high influence that otherwise the more numerous groups would have exerted on the Biplot configurations.

Keywords : Colletotrichum; Principal coordinates analysis; Gower's similarity coefficient; Biplot.

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