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. 2020 Mar 6;20:109. doi: 10.1186/s12870-020-2323-8

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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. 2 — The effect of exogenous BL on the dwarfing phenotype of dwarf-type pears and the expression of PcDWF1 in different tissues of the dwarf-type (DW) and standard-type (WT) pears. a The phenotype of the dwarf-type pear plants after spraying with exogenous BL for 1 month, with the dwarf-type and standard-type pears as the control. The plant height (b) and internode length (c) of the dwarf-type pears after spraying with exogenous BL for 1 month, with the dwarf-type and standard-type pears as the control. d The phylogenetic tree was constructed using MEGA5.2 software with the neighbor-joining method and a bootstrap test with 1000 iterations based on the amino acid sequences of BR biosynthetic rate-limiting genes in pear and Arabidopsis. e The expression of PcDWF1 in the leaves, stems, and roots of dwarf-type and standard-type pears. Data are the means ± SD of triplicate experiments. Different lowercase letters indicate significant differences according to Fisher’s LSD (P < 0.05). Asterisks (*) indicate significant differences from the control (Student’s t-test, *P < 0.05, **P < 0.01)