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

结果表明，以离体去皮根段为外植体，MS为本培养，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.

摘要以稻瘟菌粗毒素提取液为选择压，对水稻进性筛选，结果表明：粗毒素提取液对水稻愈伤组织、继代及分化有明显的抑制作用，抑制程度随毒素浓度提高而增强，且品种间差异显著。