Plant breeding

Geometry applied to breeding common beans (Phaseolus vulgaris)

J. G. Lima, Ramalho, M. A. P., Lima, J. G., Ramalho, M. A. P., Lima, J. G., and Ramalho, M. A. P., “Geometry applied to breeding common beans (Phaseolus vulgaris)”, vol. 15, p. -, 2016.

The primary components of common bean (Phaseolus vulgaris) grain yield (W) are the number of pods (X), the number of grains per pod (Y), and the weight of the grains (Z). In 1964, Grafius suggested using geometry in plant breeding; W corresponds to the volume of a parallelepiped with three axes, X, Y, and Z. Because the cube is the largest parallelepiped by volume, maximum yield is obtained when the relative contributions of X, Y, and Z are the same. We evaluated individual plants of a ‘Talismã’ x ‘L.59583’ cross in two sowing periods.

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.

Evaluation of grain yield in sorghum hybrids under water stress

C. B. Menezes, Saldanha, D. C., Santos, C. V., Andrade, L. C., Júlio, M. P. Mingote, Portugal, A. F., and Tardin, F. D., “Evaluation of grain yield in sorghum hybrids under water stress”, vol. 14, pp. 12675-12683, 2015.

Sorghum grain yield can be significantly affected by climatic changes, especially drought and high temperature. The purpose of this study was to evaluate hybrids of grain sorghum grown under normal irrigation conditions or water stress in order to select those likely to be more tolerant of drought. Forty-nine hybrids were grown in a randomized block design experiment, with three replications. The plots consisted of four rows of 5 m length. Grain yield, weight of 1000 grains, harvest index, days to flowering, and plant height were measured.

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