The formation of protective tissue of rhizomes, which composed of cork-cell-layers and phellogen-like layers, began on the 10th day after the rhizomes were put into the well-cellars and completed on the 33th day.

• 根茎保护组织由木栓化细胞层和拟木栓形成层两部分组成,从入窖第10天开始发生,33天基本完成。