Repeatability estimates and minimum number of evaluations for selection of elephant-grass genotypes for herbage production

Authors

  • Erina Vitório Rodrigues Universidade Federal de Viçosa
  • Rogério Figueiredo Daher Universidade Estadual do Norte Fluminense Darcy Ribeiro
  • Geraldo de Amaral Gravina Universidade Estadual do Norte Fluminense Darcy Ribeiro
  • Alexandre Pio Viana Universidade Estadual do Norte Fluminense Darcy Ribeiro
  • Maria do Socorro Bezerra de Araújo Universidade Estadual do Norte Fluminense Darcy Ribeiro
  • Maria Lorraine Fonseca Oliveira Universidade Estadual do Norte Fluminense Darcy Ribeiro
  • Marcelo Vivas Universidade Estadual do Norte Fluminense Darcy Ribeiro
  • Bruna Rafaela da Silva Menezes Universidade Estadual do Norte Fluminense Darcy Ribeiro
  • Antônio Vander Pereira Embrapa Gado de Leite

DOI:

https://doi.org/10.14393/BJ-v36n1a2020-42075

Keywords:

Pennisetum purpureum S., Coefficient of determination, Main components, Dry matter yield

Abstract

In forage-plants breeding, the selection of superior genotypes has been undertaken through successive harvests in previously established intervals. However, this process involves many steps, the evaluation of many traits, and a great spending with costs and labor. Thus the estimate of the repeatability is essential in improvement of perennials, it allows predicting genotypic value of the individual, the minimum number of evaluations in the selection of genotypes and minimizes resources and time in the selection of promising individuals. The objective of this study was to estimate the repeatability coefficient for morphological traits in elephant grass and determine the number of evaluations needed for phenotypic selection more efficient. The experimental randomized block design with 53 genotypes and two replications. The repeatability coefficients were estimated for variables plant height, number of tillers, stem diameter and dry matter yield, using the methods of Anova, Principal Components and Structural Analysis. We observed significant differences between genotypes (P <0.01) for all variables. The main components provide larger estimates of repeatability when compared to other methods. Estimates of the repeatability coefficients are of high magnitude average for the variables plant height (0.44) number of tillers (0.44) and stem diameter (0.63) and low magnitude for dry matter production (0.27). The Principal Components method requires five, five, two and eleven measurements for plant height, number of tillers, stem diameter and dry matter yield, respectively, with 80% reliability.

 

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Published

2020-01-01

How to Cite

RODRIGUES, E.V., DAHER, R.F.., GRAVINA, G. de A., VIANA, A.P., ARAÚJO, M. do S.B. de, OLIVEIRA, M.L.F., VIVAS, M., MENEZES, B.R. da S. and PEREIRA, A.V., 2020. Repeatability estimates and minimum number of evaluations for selection of elephant-grass genotypes for herbage production. Bioscience Journal [online], vol. 36, no. 1, pp. 30–41. [Accessed3 December 2022]. DOI 10.14393/BJ-v36n1a2020-42075. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/42075.

Issue

Section

Agricultural Sciences