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. 2021 Aug 20;22:237. doi: 10.1186/s13059-021-02448-2

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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. 6 — Schema chart of relationships between RegionA and 45S rDNA from divergence to domestication and improvement. Two possible scenarios for the RegionA origin were shown: a RegionA originated from the common ancestor of Tripsacum and Zea, and their sequence conservation resisted the reshuffling through the long term of evolution; b the introgression occurred during the process of Zea speciation, and at that moment Tripsacum could possibly be compatible to cross with. For Zea genus (blue chromosomes), RegionA fragments (red) were always protected by rDNA (green); for Tripsacum (yellow chromosomes) and common ancestor (gray chromosomes), RegionA fragment (red) and rDNA (green) were located in different chromosomes