Fig. 1. Insoluble fiber contents and dynamic changes of pericarp cells during the pigmentation of winter jujube.

A Phenotypes of winter jujube in different coloring periods. B The contents of lignin, cellulose, and hemicellulose during the pigmentation of winter jujube. C Paraffin sections of pericarp using safranin O-fast green staining in different coloring periods. C1: pericarp of W, C2: white pericarp of SR, C3: red pericarp of SR, C4: pericarp of R. D Paraffin sections of pericarp in different coloring periods. D1: pericarp of W, D2: white pericarp of SR, D3: red pericarp of SR, D4: pericarp of R. E Layers and thickness of pericarp cells in different coloring periods. W: white stage; SR-W: white pericarp of the semi-red stage; SR-R: red pericarp of the semi-red stage; R: full-red stage