Genetic diversity in Stylosanthes capitata ACCESS

Authors

  • Janaina Azevedo Martuscello Universidade Federal São João del- Rei, São João del-Rei, MG
  • Thiago Gomes dos Santos Braz Universidade Federal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG
  • Jéssica Mariane Silveira Universidade Federal São João del- Rei, São João del-Rei, MG
  • Rosangela Maria Simeão Embrapa Gado de Corte, Campo Grande, MS
  • Lara Jank Embrapa Gado de Corte, Campo Grande, MS
  • Mariane Rodrigues Ferreira Universidade Federal São João del- Rei, São João del-Rei, MG
  • Daniel Noronha Figueiredo da Cunha Universidade Federal São João del- Rei, São João del-Rei, MG

DOI:

https://doi.org/10.17523/bia.v72n4p284

Keywords:

morphology, dissimilarity, Mahalanobis distance, forage, legume, canonical variable.

Abstract

The objective of this study was to evaluate the genetic diversity and the relative importance of morphological traits for the study of genetic diversity among Stylosanthes capitata genotypes. Ten open-pollinated families (297-2, 49-5, 1064-4, 49-4, 1095-5, 141-6, 1064-6, 297-6, 625-3, and 111-3), previously selected by the Embrapa Gado de Corte improvement program, and the Campo Grande cultivar as control were evaluated. A completely randomized design consisting of four repetitions was used. The following morphological traits were studied: type of growth, length, width and length-to-width ratio of the central and lateral leaflets, plant height, stem length, and number of secondary ramifications. Mahalanobis generalized distance was calculated using the phenotypic means for each trait and the matrix of residual variances and covariances. Once the dissimilarity matrix was obtained, the families and Campo Grande cultivar were grouped using Ward€™s method. Canonical variables were also analyzed using the phenotypic mean of the traits studied and the matrix of residual variances and covariances. Cluster analysis by Ward€™s method permitted to divide the 11 genotypes into five groups. Canonical analysis was efficient since it permitted to summarize the total variation observed in the nine morphological traits into only three canonical variables, which accounted for 81.65% of the total variation in the data. The importance of the traits for clustering was also analyzed. Central leaflet width, length-to-width ratio of the central and lateral leaflets, lateral leaflet width and secondary ramifications were the most important traits for the evaluation of genetic diversity among Stylosanthes capitata genotypes.

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Published

2015-12-28

Issue

Section

FORAGE CROPS AND PASTURES

How to Cite

Genetic diversity in Stylosanthes capitata ACCESS. (2015). Bulletin of Animal Husbandry, 72(4), 284-289. https://doi.org/10.17523/bia.v72n4p284

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