The lower part of its cotyledon node zone is cotyledon node zone-roottransitionregion, and its upper part is cotyledon node zone-stem connection region.
在子叶节区下部存在子叶节区—根过渡区;子叶节区上部存在子叶节区—茎连接区。
2
The root-stemtransitionregion and the root in the elder plant reproduce the abnormal secondary structure which is similar to the rode caused by separation of the vascular bundle.