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Developing hybrids from two improved maize populations.

K Suwantaradon1, S A Eberhart

  • 1U. S. Department of Agriculture, USA.

TAG. Theoretical and Applied Genetics. Theoretische Und Angewandte Genetik
|January 16, 2014
PubMed
Summary
This summary is machine-generated.

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Recurrent selection improved maize (Zea mays L.) populations, yielding hybrids competitive with elite checks. This demonstrates the effectiveness of improved populations for developing superior conventional maize hybrids.

Area of Science:

  • Agricultural Science
  • Plant Breeding
  • Genetics

Background:

  • Maize (Zea mays L.) breeding relies on developing elite lines and hybrids.
  • Recurrent selection is a method to improve maize populations.
  • Two populations, BSK(S)C5 and BSSS(R)C5, were improved over five cycles.

Purpose of the Study:

  • To evaluate the performance of hybrids derived from improved maize populations.
  • To compare these hybrids against varietal-cross and elite single-cross hybrids.
  • To assess the effectiveness of early testing in breeding programs.

Main Methods:

  • Developed 49 hybrids from elite lines of two improved maize populations.
  • Compared hybrid performance against varietal-cross and elite single-cross checks.

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  • Utilized S1 selection and reciprocal recurrent selection for population improvement.

    • Main Results:

    • Mean yield of tested hybrids was statistically higher than the varietal-cross hybrid.
    • Nine hybrids significantly outyielded the varietal cross, with yields comparable to elite checks.
    • The top hybrid exceeded the varietal cross yield by 18%.

    Conclusions:

    • Improved maize populations from recurrent selection are valuable for conventional hybrid development.
    • Early testing in phase 1 breeding was effective in identifying promising hybrids.
    • This approach is particularly useful when varietal crosses approach 90% of elite hybrid yields.