Abstract
Soybean seed hardness is an important quality character in soybean food processing. Both vegetable soybean and natto require soft seeds to achieve a desirable sensory experience and for effective processing. In this study, we used a texture analyzer to measure the seed hardness of Chinese mini core collection via two indexes over 4 years and found significant correlations among the seed hardness, seed oil content, and germplasm eco-region. Based on 1514 SNPs, genome-wide association studies (GWAS) were conducted using a mixed linear model (MLM). Seventeen SNPs were identified to be associated with seed hardness in at least two environments. Among them, one locus, designated Q-15-0087770, was associated with two indexes, and 13 putative genes were confirmed based on their annotations in SoyBase. This research provides new insights into advanced marker-assisted selections for breeding soybeans for seed hardness and oil content.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (31471519), Modern Agro-industry Technology Research System of China (CARS-004-PS10), and Jiangsu Collaborative Innovation Center for Modern Crop Production.
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All authors have read and approved the manuscript. Han ** data. **ng Zhang, **ming Zhao, Yuanpeng Bu, and **g Huang performed genome-wide association studies. **ng Zhang wrote the manuscript.
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Fig. S1
Measurements of Fm and H using a texture analyzer. (PNG 195 kb)
Fig. S2
Frequency distributions of the Fm mean (A) and BLUP (B) and H mean (C) and BLUP (D). (PNG 124 kb)
Fig. S3
The seven eco-regions of the soybean mini core collection in China include: the Northeast spring (NESp), the North spring (NSp), the Huanghuai spring (HSp), the Huanghuai summer (HSu), the South spring (SSp), the South summer (SSu) and the South autumn (SA). (PNG 554 kb)
Fig. S4
Changes in Fm and H over seven eco-regions (A, B) and two subgroups (C, D) over 4 years. (PNG 198 kb)
Fig. S5
Frequency distributions of the mean values of seed protein content (A), moisture (B), and oil content (C) over the three years and oil content in 2012 (D), 2013 (E) and 2014 (F). (PNG 97 kb)
Fig. S6
Changes in seed protein content, oil content and moisture over seven eco-regions (A, B, C) and two subgroups over 3 years (D, E, F). (PNG 202 kb)
Fig. S7
Manhattan plots and QQ plots of Fm (A, B, C, D) and H (E, F, G, H) over 4 years in the MLM model. (PNG 2149 kb)
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Zhang, X., Zhao, J., Bu, Y. et al. Genome-Wide Association Studies of Soybean Seed Hardness in the Chinese Mini Core Collection. Plant Mol Biol Rep 36, 605–617 (2018). https://doi.org/10.1007/s11105-018-1102-2
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DOI: https://doi.org/10.1007/s11105-018-1102-2