Browsing by Autor "Cecilia Reyes"

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    Determinación de las relaciones genéticas en 24 accesiones de frijol común (Phaseolus vulgaris)
    (1998) C Martha Leticia Gutiérrez; M Gustavo Adolfo Ligarreto; W Orlando Mártinez; Cecilia Reyes
    Twenty four collections of common bean, 21 from Andean origin and three from Central America were characterized, using biochemical markers. Eight out of 22 isozyme systems showed good resolution. Six enzymes were polymorphic: Esterase (EST), Malate dehydrogenase (MOH), Shikimate dehydrogenase (SKOH), Rubisco (RBCS), Isocitrate dehydrogenase (IOH), and Glutamate dehydrogenase (GOH). Two other two enzymes, Glutamate oxalacetate transminase (GOT) for all accessions and Endopeptidase (EP), were monomorphic. A total of 17 loci were detected with at least 34 alleles. The enzymes IOH and GOH are reported the first time for the species. To define the relationships among the accessions, the Jaccard distance and the UPGMA procedures were used. The dendogram displayed two maingroups andfive subgroups. The clusters were associated with the centers of speciess domestication : Mesoamerica and the Andes,as itwasexpected.The relationships among the subgroups were analyzed and discussed accordingto the geographical origin, sites of adaptation and lineage, rather than to their morphological similarities.
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    Diversidad genética de cuatro materiales de maíz chococito en la zona baja del rio anchicaya, Pacifico colombiano
    (2000) Chabusa Martínez; Cecilia Reyes; W Orlando Mártinez
    Using methodologies based on participative research techniques, memory and uses were recuperated for 'chococito' maize varieties in the Anchicaya river area. The morpho-agronomic characterization permitted to study the main characteristics and the level of adaptation of the varieties to the environmental conditions. 20 out of 120 correlation coefficient were statistical significant. Six principal components explained 73% ofvariability among quantitative traits. Texture grain and aleurone color were the qualitative variables with high degree of discrimination among varieties. Using cluster analyses for quantitative and qualitative variables, two groups were established in each case. The dendograms for these four cultivars had shown similarity among them. Plant height, leaf area and number of grains per row permitted to determine the main variability between varieties, such as in maize hybrids and breeding varieties.