Selection indexes in the simultaneous increment of yield components in topcross hybrids of green maize

Authors

  • Willame dos Santos Candido Universidade Federal de Jataí, Campus Riachuelo, Rua Riachuelo, no 1.530, Setor Samuel Grahan, CEP 75804-020 Jataí, GO, Brazil.
  • Caique Machado e Silva Universidade Federal de Jataí, Campus Riachuelo, Rua Riachuelo, no 1.530, Setor Samuel Grahan, CEP 75804-020 Jataí, GO, Brazil.
  • Maraiza Lima Costa Universidade Federal de Jataí, Campus Riachuelo, Rua Riachuelo, no 1.530, Setor Samuel Grahan, CEP 75804-020 Jataí, GO, Brazil.
  • Bruna Elaine de Almeida Silva Universidade Federal de Jataí, Campus Riachuelo, Rua Riachuelo, no 1.530, Setor Samuel Grahan, CEP 75804-020 Jataí, GO, Brazil.
  • Beatriz Lima de Miranda Universidade Federal de Jataí, Campus Riachuelo, Rua Riachuelo, no 1.530, Setor Samuel Grahan, CEP 75804-020 Jataí, GO, Brazil.
  • Jefferson Fernando Naves Pinto Universidade Federal de Jataí, Campus Riachuelo, Rua Riachuelo, no 1.530, Setor Samuel Grahan, CEP 75804-020 Jataí, GO, Brazil.
  • Edésio Fialho dos Reis Universidade Federal de Jataí, Campus Riachuelo, Rua Riachuelo, no 1.530, Setor Samuel Grahan, CEP 75804-020 Jataí, GO, Brazil.

DOI:

https://doi.org/10.1590/S1678-3921.pab2020.v55.26668

Keywords:

Zea mays, economic weights, mixed models, REML/BLUP

Abstract

The objective of this work was to define the most suitable selective strategy for the simultaneous increment of yield components of green maize, by comparing three selection indexes weighted by economic weights and by the REML/BLUP method, in the assessment of predicted genetic gains for traits of interest. An experiment with 75 topcross hybrids from partially inbred S1 lines of green maize was carried out in Jataí, in the state of Goiás, Brazil, using a randomized complete block design, with four replicates. The following yield traits were evaluated: straw ears and commercial ears, grain mass, ear length, ear diameter, and number of ear rows. The selection indexes of Smith and Hazel, Williams, and Mulamba & Mock were applied and weighted for four economic weights (1, CVg, CVg/CVe, and h²). Among the tested selection indexes, those of Williams and Mulamba & Mock are the best-fit ones for the selection of topcross hybrids of green maize, as they provide positive and more balanced selection gains for all evaluated traits. The REML/BLUP method shows better predicted genetic gains than those achieved by the three selection indexes, besides being efficient for the selection of topcross hybrids of green maize.

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Published

2020-03-06

How to Cite

Candido, W. dos S., Silva, C. M. e, Costa, M. L., Silva, B. E. de A., Miranda, B. L. de, Pinto, J. F. N., & Reis, E. F. dos. (2020). Selection indexes in the simultaneous increment of yield components in topcross hybrids of green maize. Pesquisa Agropecuaria Brasileira, 55(X), e01206. https://doi.org/10.1590/S1678-3921.pab2020.v55.26668

Issue

V.55, Jan./Dec., 2020 :Continuos publication

Section

GENETICS