Using vessel elements segregation technology and optical microscopy, a comparative study onRosa gallica L, Rosa multifloravar.multiflora in the Rosa L was conducted to find out about the statistics about their stem, secondary xylem of vessel type, quantity, length, diameter of vessel elements, perforation plate type and the tail characteristic.The results showed that: the vessel elements of the two types of plants mostly are chiefly pitted.Perforation plates are mostly single perforation, and complex perforation and side wall perforation are also seen.The secondary wall holes are in the form of cross column or a combination of both cross column and the column type.Most of the vessel elements are found to have branched tertiary thickening and tylosis exists is also seen in them.The vessel elements of the two fall into three types: two tailed ends, one single-tailed end, and two tailless ends.The two plants are of a relatively high degree of affinity, Rosa multifloravar.multiflora is more advanced thanRosa gallica L in terms of evolution.But there are primitive characters in these two kinds of plants, and there are more primitive traits in whether different vessel elements or in the same vessel elements, indicating thatRosa gallica L and Rosa multifloravar.multiflora are of a higher position in the evolution system, but their properties are not synchronized in the evolution of the system, the ontogenetic development is just a repeated process of system development, thus displaying a different evolutionary relationship.%采用导管分子离析技术,对蔷薇属中法国蔷薇、野蔷薇的茎次生木质部的导管类型、数量,导管分子的长度、口径、穿孔板类型及尾端特征进行比较研究.结果表明:两种植物的导管分子多为孔纹.穿孔板多为单穿孔,也存在复穿孔和侧壁穿孔.次生壁纹孔为互列式或兼有互列式-对列式.多数导管分子存在分枝型的三生加厚,并存在侵填体.二者导管分子均为两端具尾、一端具尾、两端无尾3种类型.法国蔷薇和野蔷薇是亲缘程度较高的植物,野蔷薇较法国蔷薇进化,它们的导管分子也存在原始的性状,并且在同种植物的不同导管分子和同一个导管分子中均出现较原始的性状特征.表明法国蔷薇和野蔷薇在系统演化中处于较高级的地位,但它们的各种性状在系统演化中是不同步的,个体发育重演了系统发育的历程,因而表现出不同的演化关系.
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