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Euphytica

, 215:50 | Cite as

Progress for testcross performance within the flint heterotic pool of a public maize breeding program since the onset of hybrid breeding

  • Armin C. Hölker
  • Wolfgang Schipprack
  • H. Friedrich Utz
  • Willem S. Molenaar
  • Albrecht E. MelchingerEmail author
Article
  • 102 Downloads

Abstract

Maize (Zea mays L.) grain yields have risen due to agronomic improvements and plant breeding, especially since the introduction of hybrid breeding. This study was conducted to measure the breeding progress within the flint heterotic pool of a public maize breeding program since the onset of hybrid breeding. Testcrosses with two dent testers of four flint founder lines (FL), four elite flint lines from three time periods each (EL1, EL2, EL3), and seven preselected doubled haploid (DH) lines from landraces (DH-LR) were evaluated together with four commercial check hybrids (CH). Grain yield (GY) and grain dry matter content (GDMC) were assessed in six diverse environments in southwestern Germany and northeastern France in 2016. We estimated a highly significant (P < 0.001) linear increase in GY of 48 kg ha−1 yr−1. The average testcross performance of DH-LR was significantly higher than of FL. Interestingly, two of the DH-LR lines had a higher yield than all EL2 lines. We conclude that a remarkable breeding progress has been achieved and annual gain in GY does not level off yet. However, an integration of new genetic material into the flint heterotic pool for maintaining sufficient genetic diversity is needed to ensure long-term selection gain. DH lines from landraces could be used for this purpose but we recommend using multiple test environments with contrasting yield levels and agronomic conditions as well as genetically broad testers to identify the most promising lines because interactions with testers and environments are larger in these materials compared with elite lines.

Keywords

Breeding progress Doubled haploid lines Flint heterotic pool Founder lines Maize landraces 

Abbreviations

CH

Commercial check hybrids

DH

Doubled haploid

DH-LR

Doubled haploid lines from landraces

EL

Elite lines

EL1

Elite lines time period 1

EL2

Elite lines time period 2

EL3

Elite lines time period 3

FL

Flint founder lines

GCA

General combining ability

GDMC

Grain dry matter content

GY

Grain yield

SCA

Specific combining ability

UHOH

University of Hohenheim

Notes

Acknowledgements

We are indebted to the technical staff at the Chair of Applied Genetics and Plant Breeding at the University of Hohenheim for their skilled support in producing the genetic materials and conducting the field trials for this study. We also thank Prof. Piepho for critical reading of the manuscript and his suggestions for improvement. This study was supported by internal grants of the University of Hohenheim.

Supplementary material

10681_2019_2370_MOESM1_ESM.docx (250 kb)
Supplementary material 1 (DOCX 251 kb)

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  • Armin C. Hölker
    • 1
    • 2
  • Wolfgang Schipprack
    • 1
  • H. Friedrich Utz
    • 1
  • Willem S. Molenaar
    • 1
  • Albrecht E. Melchinger
    • 1
    Email author
  1. 1.Institute of Plant Breeding, Seed Sciences and Population GeneticsUniversity of HohenheimStuttgartGermany
  2. 2.Plant Breeding, TUM School of Life Sciences WeihenstephanTechnical University of MunichFreisingGermany

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