英语语法分析

Virus-free materials of Ophiopogon japonicus were obtained from meristem culture in vitro.

采用茎尖分生组织培养技术，获得了川麦冬的脱病毒试管苗。

Cells of the procambium and ground meristem are more vacuolated than those of the protoderm.

原形成层和基本分生组织的细胞比原表皮层细胞更加液泡化。

The result showed that the primordial meristem at the tip of rhizome was surrounded by 4 ~ 7 bud scale.

研究结果表明：根状茎顶端的原分生组织由4 ~ 7个鳞片包被。