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. 2021 May 31;22:166. doi: 10.1186/s13059-021-02383-2

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 3 — Gene flexibility increased during the period of intraspecific genome diversification in B. rapa. a Comparison of the expression levels of homoeologous pairs consisting of conserved and flexible syntenic genes in the Chiifu genome. “Conserved” and “Flexible” represent conserved and flexible syntenic gene in the homoeologous pair. The P value was calculated based on a paired t test. b The ratio of nonsynonymous to synonymous SNPs in CSGs and FSGs. c The ratio of LTR-related genes in CSGs and FSGs. d Frequencies of FSGs in the three B. rapa subgenomes. e Ratio of FSGs in the three subgenomes of the 18 B. rapa genomes. f The ratio of FSGs in single-, two-, and three-copy gene sets of the 18 genomes. g Ratio of least, more, and most flexible syntenic genes in the three-copy genes

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