Abstract
The organization of maize (Zea mays L.) germplasm into genetically divergent heterotic groups is the foundation of a successful hybrid maize breeding program. In this study, 94 CIMMYT maize lines (CMLs) and 54 United States germplasm enhancement of maize (GEM) lines were assembled and characterized using 1,266 single nucleotide polymorphisms (SNPs) with high quality. Based on principal component analysis (PCA), the GEM lines and CMLs were clearly separated. In the GEM lines, there were two groups classified by PCA corresponding to the heterotic groups “stiff stalk” and “non-stiff stalk”. CMLs did not form obvious subgroups by PCA. The allelic frequency of each SNP differed in GEM lines and CMLs. In total, 3.6% alleles (46/1,266) of CMLs are absent in GEM lines and 4.4% alleles (56/1,266) of GEM lines are absent in CMLs. The performance of F1 plants (n = 654) produced by crossing between different groups based on pedigree information was evaluated at the breeding nurseries of two CIMMYT stations. Genomic estimated phenotypic values of plant height and days to anthesis for a testing set of 45 F1 crosses were predicted based on the training data of 600 F1 crosses using a best linear unbiased prediction method. The prediction accuracy benefitted from the adoption of the markers associated with quantitative trait loci for both traits; however, it does not necessarily increase with an increase in marker density. It is suggested that genomic selection combined with association analysis could improve prediction efficiency and reduce cost. For hybrid maize breeding in the tropics, incorporating GEM lines which have unique alleles and clear heterotic patterns into tropically adapted lines could be beneficial for enhancing heterosis in grain yields.
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Abbreviations
- AF:
-
Agua Fria
- ANOVA:
-
Analysis of variance
- BLUP:
-
Best linear unbiased prediction
- CIMMYT:
-
International Maize and Wheat Improvement Center
- CML:
-
CIMMYT maize line
- crtRB1:
-
β-Carotene hydroxylase
- DA:
-
Days to anthesis
- GCA:
-
General combining ability
- GEM:
-
Germplasm enhancement of maize
- GWAS:
-
Genome-wide association study
- ISU:
-
Iowa State University
- LAMP:
-
Latin American Maize Project
- MAF:
-
Minor allele frequency
- MAS:
-
Marker-assisted selection
- NCU:
-
North Carolina University
- NSS:
-
Non-stiff stalk
- OPA:
-
Oligo pool assay
- PCA:
-
Principal component analysis
- SS:
-
Stiff stalk
- TL:
-
Tlaltizapán
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Acknowledgments
This work was supported by the government of Japan for germplasm enhancement of the CIMMYT maize genebank. We acknowledge both the U.S. Germplasm Enhancement of Maize (GEM) and the International Maize and Wheat Improvement Center (CIMMYT) breeders for the lines used in this study. They are provided from North Carolina University (NCU), Iowa State University (ISU) and the CIMMYT maize genebank.
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Weiwei Wen and Tingting Guo contributed equally to this work.
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11032_2011_9696_MOESM1_ESM.ppt
Fig. S1 Distribution of allelic frequency difference between germplasm enhancement of maize (GEM) and CIMMYT maize lines (CMLs). Supplementary material 1 (PPT 126 kb)
11032_2011_9696_MOESM2_ESM.ppt
Fig. S2 Distribution of kinship relations between any two lines in both 148 inbred lines and 654 F1s. GEM = Germplasm enhancement of maize; CML = CIMMYT maize line. Supplementary material 2 (PPT 120 kb)
11032_2011_9696_MOESM3_ESM.ppt
Fig. S3 Quantile–quantile plots of −log10(P) from association analysis based on a 148 inbred lines and b 654 F1s for days to anthesis (DA), and plant height (PH). The black line is the expected line under the null distribution. Under the assumption that there are few true associations, the observed P values are expected to nearly follow the expected P values. The deviations from the expectation demonstrate that the statistical analysis may cause spurious associations. Supplementary material 3 (PPT 657 kb)
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Wen, W., Guo, T., Tovar, V.H.C. et al. The strategy and potential utilization of temperate germplasm for tropical germplasm improvement: a case study of maize (Zea mays L.). Mol Breeding 29, 951–962 (2012). https://doi.org/10.1007/s11032-011-9696-1
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DOI: https://doi.org/10.1007/s11032-011-9696-1