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. 2017 Nov 2;7:14919. doi: 10.1038/s41598-017-15072-7

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© The Author(s) 2017

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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A schematic depiction illustrating a major role of SlPIN1 of basipetal auxin transport in flower organ and a postulated relationship among SlPIN1, auxin and ethylene in the regulation of pedicel abscission. SlPIN1 plays a major role in mediating auxin source-sink transport from ovary to basal organ. Auxin depletion induces SlPIN1 decrease after flower removal, but SlPIN1 protein levels in the AZ increase from 8 h after flower removal. In addition, the decreased phosphorylation levels during abscission may result in basal PM-localization of SlPIN1 protein in the AZ, which may result in improved basipetal auxin flux and sensitivity to ethylene in the AZ. Ethylene may regulate SlPIN1 auxin transport capability by improving SlPIN1 expression during abscission. In addition, ethylene influences FEI2 and PP2C expression during abscission, which are the potential kinase and phosphatase of SlPIN1, implying ethylene may also affect SlPIN1 phosphorylation status.