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. 2021 Jan 13;11:849. doi: 10.1038/s41598-020-79163-8

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© The Author(s) 2021

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

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Floral organ-specific expression patterns of AcMADS genes and a deduced pineapple ABCDE model. (A)The left y-axis scales the relative expression of RT-qPCR result and Blue solid line indicated values of RT-qPCR.The right y-axis scales the FPKM value from RNA-seq result(stage1 sepal, petal, stamen, pistil) and orange dashed line indicated values of RT-qPCR. (B) Heatmap plot of expression patterns of pineapple A-, B-, C-, D-, E-class genes from another pineapple tissue-specific transcriptome. (C) A proposed pineapple flower model based on the expression patterns and referring to the ancestral functions of homeotic MADS-box genes. Blocks in different colors with distinct heights represent different expression levels. Gene functions for specific members are in brackets. *The gene function is difficult to predict because an expression split has occurred. The gaps are linked with grey lines.