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. 2019 May 8;9:7092. doi: 10.1038/s41598-019-43582-z

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© The Author(s) 2019

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Morphological characteristics of walnut female flower buds. (A–C) show the female flower buds in the predifferentiation period identified in the undifferentiated stage (F_1); (D–F) show the female flower buds in the initial differentiation period (F_2); (G–I) show the female flower buds identified at the flower primordium differentiation period (F_3); (J–L) show the leaf buds (JRL) collected at the same stage of F_2. (A,D,G,J) are images of paraffin sections with a 100 μm scale bar; (B,E,H,K) are images of paraffin sections with a 50 μm scale bar; (C,F,I,L) show the external morphology of the buds at different stages with a 1 mm scale bar.