以ＲＲＩＭ６００等巴西橡胶无性系为树干（中间砧），以光亮橡胶变种（ＨｅｖｅａｎｉｔｉｄａＭａｒｔｖａｒ．ｔｏｘｉｃｏｄｅｎｄｒｏｉｄｅｓ）为树冠（接穗）组成的橡胶三合树，茎的生长仍保持着供体的特性，但受供体生势的明显影响。在接合部，茎的结构发生了较大变化，其中值得注意的是：（１）生势较强的树干的结构在生势较弱的树冠影响下，其多数结构指标不是变小而是变大；（２）接合部茎的一些结构（如筛管）的指标近于一致，且其结构变化足逐渐发生的。 The growth of the stems maintained the characteristics of the donor stems with the rubber trunks consisting of the Brazilian rubber clones RRIM600 as the trunk (intermediate rootstock) and the crown (scion) HeveanitidaMartvar.toxicodendroides, Obvious impact on the potential. In the junction, the structure of the stem has undergone great changes, of which it is noteworthy that: (1) the stronger the trunk structure of the tree under the influence of the weaker crown, the majority of structural indicators are not smaller but variable Large; (2) Some of the joints of stems (such as sieve tube) indicators close to the same, and its structural changes gradually occur.