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. 2020 Feb 21;11:22. doi: 10.3389/fpls.2020.00022

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Copyright © 2020 Kim, Jo, Cheon, Joo, Hong, Kwak and Kim

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(s) 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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Diagram of nuclear ribosomal (nr) DNA repeat units consisting of 18S-ITS1-5.8S-ITS2-28S-NTS-ETS. The total length of the unit is approximately 10 kb, and it is arranged as a tandem repeat. The nrDNA repeat sequences of 42 orchid species were first reported in this paper.