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A multi-trait multi-environment QTL mixed model with an application to drought and nitrogen stress trials in maize ( Zea mays L.)

Author: Malosetti, M.
Author: Ribaut, J.M.
Author: Vargas Hernández, M.
Author: Crossa, J.
Author: Eeuwijk, F. A. van
Year: 2008
URI: http://hdl.handle.net/10883/3067
Abstract: Despite QTL mapping being a routine procedure in plant breeding, approaches that fully exploit data from multi-trait multi-environment (MTME) trials are limited. Mixed models have been proposed both for multi-trait QTL analysis and multi-environment QTL analysis, but these approaches break down when the number of traits and environments increases. We present models for an efficient QTL analysis of MTME data with mixed models by reducing the dimensionality of the genetic variance–covariance matrix by structuring this matrix using direct products of relatively simple matrices representing variation in the trait and environmental dimension. In the context of MTME data, we address how to model QTL by environment interactions and the genetic basis of heterogeneity of variance and correlations between traits and environments. We illustrate our approach with an example including five traits across eight stress trials in CIMMYT maize. We detected 36 QTLs affecting yield, anthesis-silking interval, male flowering, ear number, and plant height in maize. Our approach does not require specialised software as it can be implemented in any statistical package with mixed model facilities.
Format: PDF
Language: English
Publisher: Springer
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
Type: Article
Region: Global
Pages: 241-257
Issue: 1-2
Volume: 161
DOI: 10.1007/s10681-007-9594-0
Keywords: Mixed Model
Keywords: Multi-Environment Trial
Keywords: Multi-Trait Analysis
Keywords: QTL by Environment Interaction
Keywords: Pleiotropy
Agrovoc: GENETIC CORRELATION
Agrovoc: MATHEMATICAL MODELS
Agrovoc: FIELD EXPERIMENTATION
Agrovoc: QUANTITATIVE TRAIT LOCI
Agrovoc: GENE INTERACTION
Journal: Euphytica


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  • Maize
    Maize breeding, phytopathology, entomology, physiology, quality, and biotech

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