Abstract
Maize husk number and weight are two vital traits, influencing the grain drying rate after physiological maturity, shattering and breakage rate in the progress of combine harvesting, in breeding varieties suitable for mechanized harvest. Unveiling the genetic basis of the husk number and weight would be useful for guiding maize genetic improvement of mechanical harvesting. The present study is the first to conduct a genome-wide association study of the husk number and weight. In this study, 253 maize inbred lines were evaluated in three environments to detect single nucleotide polymorphisms (SNPs) for the husk number and weight using the Maize SNP3 K Beadchip. Based on the mixed linear model, 24 associated SNPs for husk number and 29 associated SNPs for husk weight were detected with P < 0.001 in different environments as well as the best linear unbiased predictions over all environments. Eight and nine stable SNPs for husk number and weight were detected in all environments, respectively. Based on the phenotypic effects of the alleles of these stable SNPs, the favorable alleles were mined. Several typical accessions harboring favorable alleles with elite phenotypic performance of husk number and weight were identified, such as T53, BJT4, Zong3, A489, and BJT6. Five elite parental combinations were predicted for reducing maize husk number and weight. These results might serve as a basis for quantitative trait loci fine mapping and the genetic improvement of maize husk number and weight through molecular marker-assisted approach.
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Acknowledgments
This work was funded by the Scientific and Technological Program of Jiangsu Province, China (BE2013434), the Fund for Independent Innovation of Agricultural Science and Technology of Jiangsu Province, China (CX(14)2006), the Sanxin Agricultural Project of Jiangsu Province, China (SXGC(2014)088), and the Natural Science Foundation of Jiangsu Province, China (BK20141241).
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10681_2016_1698_MOESM1_ESM.tif
Supplementary material 1 (TIFF 1077 kb). Fig. S1 Neighbor-joining tree of 253 maize inbred lines. Blue line represents common maize inbred lines; red represents waxy maize inbred lines
10681_2016_1698_MOESM2_ESM.tif
Supplementary material 2 (TIFF 3167 kb). Fig. S2 Neighbor-joining tree of common maize inbred lines. Green line represents BSSS heterotic group; red line represents LAN heterotic group; purple line represent PB heterotic group
10681_2016_1698_MOESM3_ESM.tif
Supplementary material 3 (TIFF 2685 kb). Fig. S3 Neighbor-joining tree of waxy maize inbred lines. Black line represents HB522 heterotic group; red line represents TX5 heterotic group; green line represent tropical germplasm
10681_2016_1698_MOESM4_ESM.tif
Supplementary material 4 (TIFF 2539 kb). Fig. S4 Quantile–quantile plots of estimated −log10 (P) from association analysis using four models. Blue dots represent observed P values using the GLM without Q and K; green dots represent the Q model with Q; purple dots represent the K model with K; red dots represent the MLM with Q and K. (a)–(d) represent the husk number in Taian (TA), Nantong (NT), Sanya (SY), and best linear unbiased predictions (BLUPs), respectively. (e)–(h) represent the husk weight in Taian (TA), Nantong (NT), Sanya (SY), and best linear unbiased predictions (BLUPs), respectively
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Zhou, G., Hao, D., Chen, G. et al. Genome-wide association study of the husk number and weight in maize (Zea mays L.). Euphytica 210, 195–205 (2016). https://doi.org/10.1007/s10681-016-1698-y
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DOI: https://doi.org/10.1007/s10681-016-1698-y