Advertisement

Theoretical and Applied Genetics

, Volume 100, Issue 1, pp 96–104 | Cite as

Predicting hybrid value in bread wheat: biometric modelling based on a ”top-cross” design

  • F. -X. Oury
  • P. Brabant
  • P. Bérard
  • P. Pluchard
Original Article

Abstract 

Multi-environmental experimentation made it possible to compare 311 hybrids and their 59 parental lines for five characters: yield, two yield components (number of grains per m2 and 1000-grain weight), height and date of heading. At all three sites, average high-parent heterosis exceeded 6%, and our results confirm that hybrids in general head as early as the earlier parent does and are as high as the taller parent. For the five characters studied ecovalences were significantly lower in the F1 than in the parents, indicating a higher level of homeostasis for hybrids. The experimental model, based on a ”top-cross” design comprised of 55 lines used as females and four testers, made it possible to implement different hybrid-value prediction models. For yield, by far the most important character to predict, the predictor based on the general combining ability and the per se value of the parents, appears to be the most interesting. The prediction remains, however, imperfect as specific combining ability (SCA) has a strong impact for this character. Attempting to take account of SCA in the prediction, by using a multiplicative model for ”male×female” interaction modelling, did not prove convincing.

Key words Hybrid wheat Heterosis Combining ability Multiplicative model 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • F. -X. Oury
    • 1
  • P. Brabant
    • 2
  • P. Bérard
    • 1
  • P. Pluchard
    • 3
  1. 1.INRA, Station d’amélioration des plantes, domaine de Crouelle, F-63000 Clermont-Ferrand, France e-mail: oury@clermont.inra.fr, Tel.: 04-73-624326, Fax: 04-73-624453FR
  2. 2.Station de génétique végétale, Ferme du Moulon, F-91190 Gif-sur-Yvette, FranceFR
  3. 3.INRA, Station d’amélioration des plantes, domaine de Brunehaut, F-80200 Estrées-Mons, FranceFR

Personalised recommendations