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. 2018 May 9;9:610. doi: 10.3389/fpls.2018.00610

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Copyright © 2018 Wang, Li, Wu, Hu, Zheng, Zhai, Lv, Liu, Chen, Qiu, Yang, Zong, Han, Wen, Wang and Xia.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Genetic diversity and population structure of 235 soybean cultivars or accessions. (A) Population structure of 235 cultivars at K = 7. Each cultivar is represented by a single vertical line and color represents one cluster. (B) Estimated Delta K(probability of the data) calculated for K ranging from 2 to 12. (C) Phylogenetic tree constructed using neighbor-joining method. (D) Average linkage disequilibrium (LD) decay rate in the soybean genome. The mean LD decay rate was estimated as squared correlation coefficient (r²) using all pairs of SNPs located within 1 Mb of physical distance in a population of 235 soybean germplasm accessions. The dashed line in gray indicates the position where r² dropped to half of its maximum value.