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用光学显微镜技术研究了巴西橡胶树（Ｈｅｖｅａ ｂｒａｓｉｌｉｅｎｓｉｓ Ｍｕｅｌｌ．Ａｒｇ）不同高度导管的结构特征和树皮嫁接的砧穗接合区导管。研究结果表明：橡胶树从枝条、树干、根茎过渡区到小侧根的新形成的木质部导管孔径变化曲线近似“ Ｍ”形，导管密度变化曲线则近似“Ｕ”形。在树干一定高度导管孔径值有一个高峰，在根茎交界区导管孔径值和密度值都处于低谷，在枝条和细根部分，导管孔径值和导管密度值表现为负相关。树皮嫁接接合区的接穗和砧木的导管结构具有显著差异，接穗导管大于砧木。造成差异的一个重要原因在于位置效应，即取材时接穗在原来亲本中的位置和嫁接接合处在砧木中的位置不同。提供了与发育阶段无关的位置效应在嫁接中具有作用的初步证据，提出了“位置信息记忆”的概念。
The structural characteristics of Hevea brasiliensis Muell.Arg catheters at different heights and the graft of bark grafted anvil spike junction were studied by light microscopy. The results show that the newly formed xylem duct diameter curve from the branch, trunk and rhizome transitional zone to the small lateral root has an approximately “M” shape, and the curve of the duct density is approximately “U” shaped. At the height of the trunk, the height of the catheter has a peak, and the diameter and density of the catheter at the junction of the rhizome and rhizome are all in the low valley. The diameter of the catheter and the density of the catheter show a negative correlation in the branch and the fine root. There was a significant difference in the catheter structure between the scion and the rootstock in the bark grafting area, with the scion conduit larger than the rootstock. An important reason for the difference lies in the location effect, that is, the location of the scion in the original parent and the location of the graft junction in the rootstock when the material is taken are different. Provided preliminary evidence that location effects unrelated to the developmental stage had a role in grafting and proposed the concept of “location information memory.”