Nitrogen use efficiency and the genetic variation of maize expired plant variety protection germplasm

Adriano T. Mastrodomenico, C. Cole Hendrix, Frederick E. Below

Research output: Contribution to journalArticlepeer-review

Abstract

Nitrogen use efficiency (NUE) in maize (Zea mays L.) is an important trait to optimize yield with minimal input of nitrogen (N) fertilizer. Expired Plant Variety Protection (ex-PVP) Act-certified germplasm may be an important genetic resource for public breeding sectors. The objectives of this research were to evaluate the genetic variation of N-use traits and to characterize maize ex-PVP inbreds that are adapted to the U.S. Corn Belt for NUE performance. Eighty-nine ex-PVP inbreds (36 stiff stalk synthetic (SSS), and 53 non-stiff stalk synthetic (NSSS)) were genotyped using 26,769 single-nucleotide polymorphisms, then 263 single-cross maize hybrids derived from these inbreds were grown in eight environments from 2011 to 2015 at two N fertilizer rates (0 and 252 kg N ha–1) and three replications. Genetic utilization of inherent soil nitrogen and the yield response to N fertilizer were stable across environments and were highly correlated with yield under low and high N conditions, respectively. Cluster analysis identified inbreds with desirable NUE performance. However, only one inbred (PHK56) was ranked in the top 10% for yield under both N-stress and high N conditions. Broad-sense heritability across 12 different N-use traits varied from 0.11 to 0.77, but was not associated with breeding value accuracy. Nitrogen-stress tolerance was negatively correlated with the yield increase from N fertilizer.

Original languageEnglish (US)
Article number3
JournalAgriculture (Switzerland)
Volume8
Issue number1
DOIs
StatePublished - Jan 2018

Keywords

  • Expired plant variety protection (ex-PVP)
  • Maize
  • Nitrogen stress
  • Nitrogen use efficiency (NUE)
  • U.S. corn belt germplasm

ASJC Scopus subject areas

  • Food Science
  • Agronomy and Crop Science
  • Plant Science

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