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GrainGenes Reference Report: TAG-100-96

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Reference	TAG-100-96
Title	Predicting hybrid value in bread wheat: biometric modelling based on a 'top-cross' design
Journal	Theoretical and Applied Genetics
Year	2000
Volume	100
Pages	96-104
Author	Oury FX Brabant P Berard P Pluchard P
Abstract	Summary: 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 Fl 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 x female' interaction modelling, did not prove convincing
External Databases	http://link.springer-ny.com/link/service/journals/00122/bibs/0100001/01000096.htm
Keyword	[ Hide all but 1 of 24 ] agronomic characteristics bread bread wheat crop yield design experimental design field experimentation france general combining ability genetic models genotype environment interaction heading date heterosis hybrid mathematical models modelling plant height prediction specific combining ability test plants triticum aestivum variance variety trials yield components

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