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. 2021 Mar 2;11:4957. doi: 10.1038/s41598-021-84518-w

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© The Author(s) 2021

Open Access This 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/.

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Somatic embryogenesis and germination groups of Liriodendron hybrids. The somatic embryogenesis group includes PEM and S1–S7, while the germination group includes cotyledon, hypocotyl and radicle. PEM, proembryogenic masses; S1, proembryogenic single cell stage; S2,embryogenic single cell stage; S3, two to four cell proembryo stage; S4, multicell proembryo stage; S5, globular embryo stage; S6, heart/torpedo -shaped embryo stage; S7, cotyledon embryo stage; PL, plantlet developed from somatic embryo. (The images of PEM and S1 to S7 were provided by the Key Laboratory of Forest Genetics and Biotechnology, Ministry of Education of China, Co-Innovation Center for the Sustainable Forestry in Southern China, Nanjing Forestry University).