中文摘要：

目的研究南方红豆杉根的显微结构及其内生真菌的分布。方法取自然生长状态下南方红豆杉根，石蜡切片光学显微观察并照相。结果南方红豆杉根的次生结构由周皮和维管系统组成，次生木质部由轴向系统和径向系统两部分构成。轴向系统由管胞和木薄壁组织细胞组成；径向系统由木射线构成；根的次生韧皮部则由筛胞和韧皮薄壁细胞组成。次生韧皮中分布有少量韧皮纤维，韧皮射线不明显。根被细胞中分布有大量内生真菌菌丝。结论南方红豆杉根的次生构造与其他裸子植物和双子叶植物一致，但次生木质部由管胞，次生韧皮部由筛胞组成。内生真菌分布于红豆杉根被细胞，并只在一定区域细胞中分布。

英文摘要：

Objective To study the root microstructure and the distribution of the endophytic fungi in Taxus chinertsis var. mairei. Methods The roots of Taxus chinertsis var. mairei at nature were cut with paraffin, dyed and observed by microscope. Results The secondary structure of the roots of Taxus chinertsis var. mairei consisted of the periderm and vascular cylinder （stele）. Axial and radial systems formed the secondary xylem of the roots. Tracheids and xylary parenchyma cells constituted the axial system, and xylary radial formed the radial systems. The secondary phloem consisted of sieve cells and phloem parenchymas. Only a small quantity of phloem fibers were distributed in the secondary phloem, and the phloem ray was unconspicuous. Many endophytic mycelia penetrated in the velamina. Conclusions The secondary structure of the root of Taxus chinertsis var. mairei accords with that of other gymnosperms and dicotyledons, although its secondary xylem is constituted with tracheids and sieve cells. The endophytic mycelia exists in the local cells of velamina in the roots of Taxus chinertsis var. mairei.