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Strategies to subdivide a target population of environments: Results from the CIMMYT-led maize hybrid testing programs in Africa

Author: Windhausen, V.S.
Author: Wagener, S.
Author: Magorokosho, C.
Author: Makumbi, D.
Author: Vivek, B.
Author: Piepho, H-P
Author: Melchinger, A.E.
Author: Atlin, G.N.
Year: 2012
ISSN: 0002-1962
URI: http://hdl.handle.net/10883/3172
Abstract: To develop stable and high-yielding maize (Zea mays L.) hybrids for a diverse target population of environments (TPE), breeders have to decide whether greater gains result from selection across the undivided TPE or within more homogeneous subregions. Currently, CIMMYT subdivides the TPE in eastern and southern Africa into climatic and geographic subregions. To study the extent of specific adaptation to these subregions and to determine whether selection within subregions results in greater gains than selection across the undivided TPE, yield data of 448 maize hybrids evaluated in 513 trials across 17 countries from 2001 to 2009 were used. The trials were grouped according to five subdivision systems into climate, altitude, geographic, country, and yield-level subregions. For the first four subdivision systems, genotype × subregion interaction was low, suggesting broad adaptation of maize hybrids across eastern and southern Africa. In contrast, genotype × yield-level interactions and moderate genotypic correlations between low- and high-yielding subregions were observed. Therefore, hybrid means should be estimated by stratifying the TPE considering the yield-level effect as fixed and appropriately weighting information from both subregions. This strategy was at least 10% better in terms of predicted gains than direct selection using only data from the low- or high-yielding subregion and should facilitate the identification of hybrids that perform well in both subregions.
Format: PDF
Language: English
Publisher: Crop Science Society of America (CSSA)
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: 2143-2152
Issue: 5
Volume: 52
DOI: 10.2135/cropsci2012.02.0125
Publisher URI: https://www.crops.org/publications/cs/abstracts/52/5/2143
Agrovoc: MAIZE
Agrovoc: HIGH YIELDING VARIETIES
Agrovoc: CLIMATIC ZONES
Agrovoc: FIELD EXPERIMENTATION
Agrovoc: GENOTYPE ENVIRONMENT INTERACTION
Journal: Crop Science


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

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