Fig. 4

Expression profiles of the pineapple bHLH genes. Hierarchical clustering of expression profiles of bHLHs in different organs and developmental stages. Red color represents a high level of transcript abundance, and blue color represents low transcript abundance. The right side of the figure shows the scale. Different groups i.e. group I, group II and group III represent low expressed, highly expressed, and moderately expressed bHLH genes, respectively. Gene IDs in red represent pineapple CIB genes. Details of the samples are mentioned at the bottom of each lane: sepal Se1–Se4, gynoecium Gy1- Gy7, ovule Ov1–Ov7, petal Pe1–Pe3, stamen St1–St6, fruit ‘Fr_S1–Fr_S7’, root ‘Ro’, leaf ‘Le’, and flower ‘Fl’ where ‘S’ is the abbreviation for ‘stage