大约半个月后，在靠近表面的愈伤组织中出现木栓形成层。
And about a half month phellogen will begin to appear in the callus near the surface.
同时，运用石蜡切片法研究剥皮后愈伤组织的形成、木栓形成层和维管形成层的发生；
Meanwhile, paraffin-cut section method was used for studying on callus formation, cork cambium and vascular cambium initiation.
木栓厚度，通气组织，管孔直径和导管数量与抗涝性相关。
The thickness of phellem, aerenchyma, diameter of vessel holes, and the number of vessels are related to the anti-waterlogging character.
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