Results:Hairy roots of autotetraploid Isatis indigotica Fort.could be induced by Agrobacterium rhizogenes strain A4 and hairy roots had significant antiendotoxic action.

• 结果：A4菌株能诱导四倍体菘蓝产生毛状根，毛状根具有较强的抗内毒素作用。