Multivariate analysis

Phenotypic characteristics for discrimination between advanced genotypes of Brachiaria ruziziensis

B. A. Rezende, Ribeiro, C. B., Teixeira, D. H. L., Gonçalves, F. M. A., F. Sobrinho, S., Rezende, B. A., Ribeiro, C. B., Teixeira, D. H. L., Gonçalves, F. M. A., F. Sobrinho, S., Rezende, B. A., Ribeiro, C. B., Teixeira, D. H. L., Gonçalves, F. M. A., and F. Sobrinho, S., Phenotypic characteristics for discrimination between advanced genotypes of Brachiaria ruziziensis, vol. 15, p. -, 2016.

The aim of this study was to use multivariate methods and Pearson and partial correlations to disregard phenotypic characteristics that contribute little to differentiation between Brachiaria ruziziensis genotypes. Eighty-one genotypes of B. ruziziensis were assessed in completely randomized blocks with three replications.

Multivariate analysis of backcross progeny of Passiflora L. (Passifloraceae) for pre-breeding genotype selection

C. A. F. Melo, Souza, M. M., Sousa, A. G. R., Viana, A. P., and Santos, E. A., Multivariate analysis of backcross progeny of Passiflora L. (Passifloraceae) for pre-breeding genotype selection, vol. 14, pp. 15376-15389, 2015.

The Ward-MLM procedure was used to evaluate genetic variation in four backcross progenies and in their parents, hybrid F1 HD13 and donor parent Passiflora sublanceolata. Sixteen quantitative descriptors and five qualitative characteristics of relevance to ornamental flower production were assessed. Using the pseudo-F and pseudo-T² criteria, we identified four groups among these plants in two evaluation periods. In both evaluations, the BC1 plants showed greater dissimilarity to their recurrent parent, but showed high genetic similarity with the P. sublanceolata parent.

Selection of cowpea progenies with enhanced drought-tolerance traits using principal component analysis

C. C. Sousa, Damasceno-Silva, K. J., Bastos, E. A., and Rocha, M. M., Selection of cowpea progenies with enhanced drought-tolerance traits using principal component analysis, vol. 14, pp. 15981-15987, 2015.

Vigna unguiculata (L.) Walp (cowpea) is a food crop with high nutritional value that is cultivated throughout tropical and subtropical regions of the world. The main constraint on high productivity of cowpea is water deficit, caused by the long periods of drought that occur in these regions. The aim of the present study was to select elite cowpea genotypes with enhanced drought tolerance, by applying principal component analysis to 219 first-cycle progenies obtained in a recurrent selection program.

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