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The genetic structure of CIMMYT and US inbreds and its implications for tropical maize breeding

Creator: Rui Guo
Creator: Jiafa Chen
Creator: Petroli, C.D.
Creator: Pacheco Gil, R. A.
Creator: Zhang, X.
Creator: San Vicente, F.M.
Creator: Hearne, S.
Creator: Dhliwayo, T.
Year: 2021
URI: https://hdl.handle.net/10883/21272
Language: English
Publisher: CSSA
Publisher: Wiley
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
Place of Publication: Madison (USA)
Volume: In press
DOI: 10.1002/csc2.20394
Description: The use of temperate maize inbreds with expired plant variety protection in tropical maize breeding programs could enhance the combining ability for grain yield among tropical heterotic groups. We used DNA markers from the DArTseq genotyping‐by‐sequencing platform to investigate the genetic structure of lines with expired U.S. Plant Variety Protection (ex‐PVP) relative to CIMMYT's maize heterotic groups. Neighbor‐joining cluster analysis revealed two major groups: CIMMYT and ex‐PVP. The CIMMYT lines clustered according to their pedigree relationships and adaptation, but not according to their heterotic groups. In contrast, ex‐PVP lines clustered according to the Stiff Stalk Synthetic (BSSS) and non‐Stiff Stalk Synthetic (NSSS) heterotic groups, except for a few lines that were considered to be mixed. The genetic divergence between BSSS and NSSS (FST = 0.053; P<0.01) was four times as large as the divergence between CIMMYT Tuxpeño and non‐Tuxpeño heterotic groups (FST = 0.013; P = 0.068). Estimates of genetic divergence marginally favored breeding with BSSS in Tuxpeño and NSSS in non‐Tuxpeño. However, CIMMYT breeders may still exploit the ex‐PVP heterotic structure fully only by ensuring that the temperate heterotic groups are placed on opposite sides of the Tuxpeño and non‐Tuxpeño heterotic pattern. We also showed how estimates of admixture from model‐based clustering could be used to avoid ex‐PVP lines of mixed heterotic background when selecting lines to maximize the genetic divergence and combining ability of CIMMYT heterotic groups.
Agrovoc: MAIZE
Agrovoc: INBRED LINES
Agrovoc: PLANT BREEDING
Agrovoc: GENETIC STRUCTURES
ISSN: 1435-0653
Journal: Crop Science


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  • Genetic Resources
    Genetic Resources including germplasm collections, wild relatives, genotyping, genomics, and IP

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