Callus was efficiently induced from in vitro root segment devoid of rhizodermis on MS medium.

结果表明，离体去皮根段为外植体，MS为基本培养基，诱导愈伤组织较为适宜。

Under the selection pressure of crude toxin filtration, three kinds of treatment methods and four kinds of phytotoxin concentrations were used to screen the blast-resistant callus phenylalanine.

稻瘟病病菌粗毒素为选择压，对水稻进行抗病性筛选，结果表明：粗毒素对水稻愈伤组织诱导、继代及分化有明显的抑制作用，抑制程度随毒素浓度高而增强，且品种间差异显著。