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.

摘要以稻瘟病病菌粗毒素提取液为选择压，对水稻进行抗病性筛选，果表明：粗毒素提取液对水稻愈伤组诱导、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，且品异显著。

This transforms the callus into a tougher fibrocartilaginous callus, which bridges the gap between the two pieces of bone.

这个过程将血痂转变成一更的纤维软骨痂，它把两块分裂的骨骼桥接在一起。