Potential of maize (Zea mays L.) populations derived from commercial single-cross hybrids for extraction of partially inbred lines under different nitrogen availability

Authors

  • Rafael Heinz Monsanto do Brasil. Av. das Nações Unidas, 12901, CEP 04578-000. São Paulo. SP. Brazil
  • Larissa Pereira Ribeiro Teodoro Federal University of Mato Grosso do Sul (UFMS/CPCS). Department of Crop Science. Chapadão do Sul. MS. Brazil. L.P.R.
  • Manoel Carlos Gonçalves Department of Crop Science, Federal University of Grande Dourados (UFGD). Dourados. MS. Brazil
  • Leonardo de Azevedo Peixoto Monsanto do Brasil. Av. das Nações Unidas, 12901, CEP 04578-000. São Paulo. SP. Brazil
  • Leonardo Lopes Bhering Federal University of Viçosa (UFV). Department of General Biology. Biometrics Laboratory. Viçosa. MG. Brazil
  • Paulo Eduardo Teodoro Federal University of Mato Grosso do Sul (UFMS/CPCS). Department of Crop Science. Chapadão do Sul. MS. Brazil. L.P.R.

Keywords:

breeding population, maize breeding, nitrogen, top-cross, Zea mays

Abstract

Graphical_Abstract.jpg

Extraction of inbred lines is a very important step in maize breeding since these lines will be used to obtain hybrids intended for the market. However, this expensive process, hinders genotype evaluation in contrasting environments, especially regarding nitrogen (N) content. This study aimed to evaluate the potential of maize populations for line extraction and select partially inbred lines under different soil nitrogen (N) availability. Five populations were evaluated regarding their potential for line extraction. Fifty-five S1 partially inbred lines were extracted from these populations. The top-cross method was used to evaluate lines by crossing them with two testers. Hybrids evaluation used 110 top-cross hybrids, five base populations, and six checks. Two trials were carried out in Dourados and Caarapó. One trial had adequate fertilization (high N) while the other was under stress condition (low N). Hybrid DKB 789 showed potential for extraction of partially inbred lines, aiming at selecting N use efficiency. Base population BP (07) was the most suitable for the extraction of partially inbred lines aiming at N use efficiency. Partially inbred lines BP (07) 13, BP (07) 14, and BP (07) 17 are the most suitable for the extraction of top-cross hybrids with high grain yield, efficiency, and responsiveness to N.

Highlights

  • Extraction of inbred lines is a very important step in maize breeding.
  • Hybrid DKB 789 showed potential for extraction of partially inbred lines.
  • BP (07) 13, BP (07) 14, and BP (07) 17 are the most suitable for the extraction of top-cross hybrids.

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Published

01-12-2020

Issue

Section

Genetics and plant breeding

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