山核桃嫁接愈合过程的解剖学观察

山核桃嫁接经过了愈伤组织形成、对接、维管束桥的形成及维管分化等过程。休眠的形成层薄，只有3层左右细胞，嫁接后9d，愈伤组织首先发生于形成层，再在皮层和韧皮部处发生；14d后，愈伤组织对接，呈点状分布，隔离层也逐渐消失；接后24d，维管束桥形成，并进一步分裂分化产生输导组织，实现嫁接体的完全愈合。山核桃形成层薄，嫁接时很难与砧木准确对接，这是山核桃嫁接成活率低的原因，以化香为砧木嫁接山核桃则存在不亲合现象。图1参10。

Anatomical observation in graft union of Carya cathayenisis

The geraft union of Carya cathayensis had these progresses range from callus formation，callus contract with each other，vascular bridges formation，to vascular difference．The cambium，composed of only three layer cells in it's dormant，was the first location to form callus after 9 days grafting．After that，callus generated at cortex and phloem．Two weeks later after grafting，the callus contacted with each other and the isolated layer was absorbed gradually．In 24 days，vascular bridge formed，which further divided and gave difference to form vascular tissue，then to cause success of grafting．It also gave an analysis to the anatomical reason for lower percent of grafting in this species，and provided an anatomical basis on in-compatibility in grafting of C． cathayensis（scion） with Platycarya strobilacea （stock）．