The results showed,the growth of taproot stagnated after seed germinating,then hypocotyl expanded into stem tuber with the structure of stem. With development,abnormal structure appeared so that stem tuber growed continually.

• 仙客来营养器官的解剖试验表明 ,仙客来种子萌发后 ,主根早期停滞发育 ,由下胚轴膨大具有茎结构特征的块茎 ,随着发育产生异常结构 ,致使块茎不断长大。