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. 2020 Feb 28;3:89. doi: 10.1038/s42003-020-0821-8

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© The Author(s) 2020

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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Fig. 1 — a KOVA flower with pale pink perianths, a purple-red epichile, and a yellow hypochile in the full-bloom stage. b The epichile is pigmented by anthocyanins, and carotenoids are the main contributor to the yellow colour in the hypochile. c Morphological anatomy of KOVA flowers during floral development. Development stage 1 (D1, bub length < 2 cm), D2 (bub length 2–3 cm), D3 (bub length 3–4 cm), D4 (bub length 4–5 cm), D5 (bub length 5–6 cm), D6 (bub length > 6 cm), D7 (2 days after flowering), and D8 (ten days after flowering). d Sampling strategy: sepals, petals, epichiles, and hypochiles were collected at D1, D4, D7 and D8, respectively, for transcriptome sequencing and metabolome identification. Bar = 1 cm.