Yield components and reproductive, physiological, and root traits used in early selection for nitrogen use efficiency in corn

Authors

  • Pedro Patric Pinho Morais Universidade Federal de Viçosa, Departamento de Biologia Geral, Avenida P.H. Rolfs, s/no, Campus Universitário, CEP 36570-900 Viçosa, MG.
  • Massaine Bandeira e Sousa Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Genética, Avenida Pádua Dias, no 11, Caixa Postal 9, CEP 13418-900 Piracicaba, SP.
  • Giovanni Galli Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Genética, Avenida Pádua Dias, no 11, Caixa Postal 9, CEP 13418-900 Piracicaba, SP.
  • Luciano Rogério Braatz e Andrade Universidade Federal de Viçosa, Departamento de Biologia Geral, Avenida P.H. Rolfs, s/no, Campus Universitário, CEP 36570-900 Viçosa, MG.
  • Roberto Fritsche-Neto Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Departamento de Genética, Avenida Pádua Dias, no 11, Caixa Postal 9, CEP 13418-900 Piracicaba, SP.
  • Aluízio Borém de Oliveira Universidade Federal de Viçosa, Departamento de Biologia Geral, Avenida P.H. Rolfs, s/no, Campus Universitário, CEP 36570-900 Viçosa, MG.

DOI:

https://doi.org/10.1590/S1678-3921.pab2018.v53.25308

Keywords:

Zea mays, abiotic stress, GBlup, indirect selection, path analysis, selection index

Abstract

The objective of this work was to examine the possibility of using yield components and reproductive, physiological, and root traits in early selection for nitrogen use efficiency (NUE) in corn. Sixty-four inbred lines were evaluated under two nitrogen fertilization levels: ideal and low. The evaluations were performed at three phenological stages: eight fully-expanded leaves, tasseling stage, and physiological maturity. It is possible to select superior lines for NUE, but the yield components did not show differential behavior under the different nitrogen levels evaluated. Root, reproductive, and physiological traits are not promising for early selection of corn lines with high NUE. Likewise, the eight-leaves and tasseling stages were not promising for this purpose, since NUE should be estimated taking grain yield into account. However, indirect selection for NUE can be performed via number of ears or using the selection index considering number and weight of ears.

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Published

2018-08-13

How to Cite

Morais, P. P. P., Sousa, M. B. e, Galli, G., Andrade, L. R. B. e, Fritsche-Neto, R., & Oliveira, A. B. de. (2018). Yield components and reproductive, physiological, and root traits used in early selection for nitrogen use efficiency in corn. Pesquisa Agropecuaria Brasileira, 53(5), 633–640. https://doi.org/10.1590/S1678-3921.pab2018.v53.25308

Issue

v.53, n.5, May 2018

Section

GENETICS