Variación de caracteres morfológicos del pasto kikuyo (Cenchrus clandestinus) en el trópico alto de Antioquia

The kikuyu grass ( Cenchrus clandestinus ) represents about 80% of the base of all the forage supply of specialized dairy country. The aim of this study was to evaluate and compare some morphological characters in kikuyu grass populations located in the high tropics Antioqueno. 384 samples of plant material were collected in three areas of the department of Antioquia. For each sample width and length of the lamina, internode length, diameter internode, width node, width and length of the sheath it was established. In order to represent a two-dimensional geometric space in existing proximity between experimental units collected in different municipalities, an analysis of multidimensional scaling (MDS) it was performed. In addition the results were analyzed using generalized linear models (GLM) using each measure as dependiente variable. The municipality had a highly significant (p <0.01) on all measured morphological characters. For the characteristic diameter internodes, wide internodes, lamina and sheath; the days of rest and altitude, had a highly significant effect (p <0.01). Although a pattern of similarities between morphological characteristics were found, the effects included in the models were all statistically significant for each of these characters To establish better results that may be potential for future breeding programs is recommended to associate this information with studies diversity and genetic variation. Morphological variation of characters of kikuyu grass ( Cenchrus clandestinus ) in the high tropics of Antioquia The kikuyu grass ( Cenchrus clandestinus ) represents about 80% of the base of all the forage supply of specialized dairy country. The aim of this study was to evaluate and compare some morphological characters in kikuyu grass populations located in the high tropics Antioqueno. 384 samples of plant material were collected in three areas of the department of Antioquia. For each sample width and length of the lamina, internode length, diameter internode, width node, width and length of the sheath it was established. In order to represent a two-dimensional geometric space in existing proximity between experimental units collected in different municipalities, an analysis of multidimensional scaling (MDS) it was performed. In addition the results were analyzed using generalized linear models (GLM) using each measure as dependiente variable. The municipality had a highly significant (p <0.01) on all measured morphological characters. For the characteristic diameter internodes, wide internodes, lamina and sheath; the days of rest and altitude, had a highly significant effect (p <0.01). Although a pattern of similarities between morphological characteristics were found, the effects included in the models were all statistically significant for each of these characters To establish better results that may be potential for future breeding programs is recommended to associate this information with studies diversity and genetic variation. Keywords: cenchrus , ecotype, grasses. Variacao de caracteres morfologicos de Kikuyu Grass ( Cenchrus clandestinus ) na alta Tropico de Antioquia A grama kikuyu ( Cenchrus clandestinus ) representa cerca de 80% da base de toda a oferta de forragem pais leiteiro especializado. O objetivo deste estudo foi avaliar e comparar alguns caracteres morfologicos em populacoes pennisetums Antioqueno localizadas nas altas tropicos. 384 amostras de material vegetal foram coletadas em tres areas do departamento de Antioquia. Para cada largura da amostra e comprimento da lâmina, comprimento dos entrenos, entrenudos diâmetro, nos largura, largura e comprimento da bainha foi estabelecido. A fim de representar um espaco geometrico bidimensional na proximidade existente entre as unidades experimentais coletados em diferentes municipios, uma analise de escalonamento multidimensional (MDS) foi realizada. Alem disso, os resultados foram analisados ​​usando modelos lineares generalizados (GLM), utilizando cada medida como variavel dependiente. O municipio tinha uma correlacao altamente significativa (p <0,01) em todos os caracteres morfologicas medidos. Para a funcao de diâmetro entrenudos, entrenos de largura, lâmina e bainha; os dias de descanso e a altitude, teve um efeito altamente significativo (p <0,01). Embora um padrao de semelhancas entre as caracteristicas morfologicas nao foi foram encontrados, os efeitos incluidas nos modelos foram todas estatisticamente significativas para cada um desses personagens Para estabelecer melhores resultados que podem ser potencial para futuros programas de melhoramento e recomendado para associar esta informacao com estudos diversidade e variacao genetica. Palavras-chave: cenchrus, ecotype, pastagens . DOI: http://dx.doi. org/10.21615/cesmvz.12. 1.4