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. 2020 Sep 21;21:644. doi: 10.1186/s12864-020-06999-9

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© The Author(s) 2020

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. 1 — Phylogenetic tree and the distribution of LBD genes of three species in seven subgroups, including class Ia-Id, class IIa and class IIb. (a) A phylogenetic tree of LBD proteins of pear, apple and Arabidopsis. A phylogenetic tree of LBD protein family was constructed by Mega-X using the Neighbor–Joining (NJ) method and 1000 bootstraps. The red branches indicates the class I genes, and the blue branches indicates the class II. The yellow star, green circle and blue tick indicates the LBD protein in pear, apple and Arabidopsis, respectively. (b) The percentage of LBD genes of three species in each subgroup. The orange part indicates the proportion of LBD genes in pear; The green part indicates the proportion of LBD genes in apple; The blue part indicates the proportion of LBD genes in Arabidopsis