These pathogenic characteristics that could cause corm tissue to bring browning reaction, lignose of cell wall to increase, and faecula granule to decrease, were also observed by using tissue sectioning.

• 用组织切片法观察发现病菌能使香蕉苗球茎组织产生褐变，引起细胞壁木质素增加及淀粉颗粒减少。