root collar造句

例句与造句

1. After long terms culture under al stress , the root system of untransformed control was soft and rotted and covered with purple bacterium . we compared root tip , root collar and root - stem transition region and found the transgenic plants have relative normal root system
   铝溶液长期处理的根系外部形态具有较大差异，从根尖、根中部和根茎交接处做了比较，发现对照的根系软腐并有紫色菌着生，而转基因植株根系相对保持正常。
2. It's difficult to find root collar in a sentence. 用root collar造句挺难的