Journal article
The genetic architecture of maize height
Genetics (Austin), Vol.196(4), pp.1337-1356
04/2014
Handle:
https://hdl.handle.net/2376/114834
PMCID: PMC3982682
PMID: 24514905
Abstract
Height is one of the most heritable and easily measured traits in maize (Zea mays L.). Given a pedigree or estimates of the genomic identity-by-state among related plants, height is also accurately predictable. But, mapping alleles explaining natural variation in maize height remains a formidable challenge. To address this challenge, we measured the plant height, ear height, flowering time, and node counts of plants grown in >64,500 plots across 13 environments. These plots contained >7300 inbreds representing most publically available maize inbreds in the United States and families of the maize Nested Association Mapping (NAM) panel. Joint-linkage mapping of quantitative trait loci (QTL), fine mapping in near isogenic lines (NILs), genome-wide association studies (GWAS), and genomic best linear unbiased prediction (GBLUP) were performed. The heritability of maize height was estimated to be >90%. Mapping NAM family-nested QTL revealed the largest explained 2.1 ± 0.9% of height variation. The effects of two tropical alleles at this QTL were independently validated by fine mapping in NIL families. Several significant associations found by GWAS colocalized with established height loci, including brassinosteroid-deficient dwarf1, dwarf plant1, and semi-dwarf2. GBLUP explained >80% of height variation in the panels and outperformed bootstrap aggregation of family-nested QTL models in evaluations of prediction accuracy. These results revealed maize height was under strong genetic control and had a highly polygenic genetic architecture. They also showed that multiple models of genetic architecture differing in polygenicity and effect sizes can plausibly explain a population's variation in maize height, but they may vary in predictive efficacy.
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Details
- Title
- The genetic architecture of maize height
- Creators
- Jason A Peiffer - Department of Genetics, Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina 27695Maria C RomayMichael A GoreSherry A Flint-GarciaZhiwu ZhangMark J MillardCandice A C GardnerMichael D McMullenJames B HollandPeter J BradburyEdward S Buckler
- Publication Details
- Genetics (Austin), Vol.196(4), pp.1337-1356
- Academic Unit
- Crop and Soil Sciences, Department of
- Publisher
- United States
- Identifiers
- 99900547832901842
- Language
- English
- Resource Type
- Journal article