采用导管分子离析技术，研究了小叶女贞、女贞、迎春、桂花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.结果表明：4种植物的穿孔板均为单穿孔板，次生壁为孔纹加厚，还具明显螺纹状三生加厚.均具有两端具尾、一端具尾、两端无尾3种类型导管.导管分子长度、直径、尾端长度及端壁倾斜角存在差异.4种植物是进化程度较高的植物，同种植物导管分子性状的进化不是以相同的速度同步发生.4种植物次生木质部管状分子的个体发育重演了系统发育的历程.%By use of vessel element segregation technology,Ligustrumquihoui,Ligustrumlucidum,Jasminumnudi-florum,Osmanthusfragrans duct type and quantity of secondary xylem,vessel element length,diameter,perforation plate type and the tail characteristic are all studied.The results showed that:Perforation plates of the four kinds of plants are simple perforation plate.The secondary wall is a hole pattern thickening,but also obviously whorled threaded tertiary thickening.The duct type falls into three:two tailed ends,one tailed end,and two tailless ends.The vessel length,diameter,length of tail end and wall inclination angle are all found to have differences .The four plant species are highly evolved plants,and the evolution of the molecular characteristics of the same plant is not synchronous at the same rate.The individual development of the sec-ondary xylem ducts of the four plants repeats the course of the system development.
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