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. 2019 Apr 27;20:320. doi: 10.1186/s12864-019-5666-5

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© The Author(s). 2019

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. 3 — Expression levels of unigenes assigned to the carotenoid and apocarotenoid biosynthetic pathways in Crocus. a) An overview of the crocins biosynthesis pathway enzymes and metabolites in Crocus. Homologues genes encoding for the different enzymes were identified in the transcriptome assembly. b) Expression analyses of genes encoding from the enzymes of the carotenoid biosynthesis pathway identified in the transcriptomes from I and II stages of the three Crocus species. c) Expression analyses of homologues to carotenoid cleavage enzymes (CCD1, CCD2, CCD4, CCD7, CCD8 and NCED), to the β-carotene isomerase D27 and UGT74AD2 genes identified in the six transcriptomes. d) Expression analyses of ALDH genes homologues identified in the six transcriptomes analysed