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. 2015 Dec 21;13:108. doi: 10.1186/s12915-015-0219-0

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© Flematti et al. 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 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.

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Fig. 7. — Possible evolution of the karrikin response system in plants. The KAI2 gene can be traced back to single-celled algae. Gene duplication before the evolution of seed plants leading to DWARF14 genes probably provided the opportunity for functional specialisation of KAI2-type genes, including roles in the response to karrikins and the response of parasitic plants to host-derived strigolactones. The origin of strigolactones is unclear since mosses are reported to produce them. Karrikin-like signals distinct from strigolactones probably have an ancient origin