[南方红豆杉根的微观结构及内生真菌的分布]
[Root microstructure and distribution of the endophytic fungi in Taxus chinensis var. mairei].
作者信息
Tan Xiao-Ming, Cuo Shun-Xing
机构信息
Mycorrhizal Department, Institute of Medicinal Plant Development, CAMS and PUMC, Beijing 100094, China.
出版信息
Zhongguo Yi Xue Ke Xue Yuan Xue Bao. 2006 Jun;28(3):372-4.
OBJECTIVE
To study the root microstructure and the distribution of the endophytic fungi in Taxus chinensis var. mairei.
METHODS
The roots of Taxus chinensis var. mairei at nature were cut with paraffin, dyed and observed by microscope.
RESULTS
The secondary structure of the roots of Taxus chinensis 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 chinensis 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 chinensis var. mairei.
目的
研究南方红豆杉根的微观结构及内生真菌的分布情况。
方法
采集自然状态下的南方红豆杉根，经石蜡切片、染色后进行显微镜观察。
结果
南方红豆杉根的次生结构由周皮和维管柱（中柱）组成。轴向系统和径向系统构成根的次生木质部。管胞和木薄壁细胞构成轴向系统，木射线构成径向系统。次生韧皮部由筛胞和韧皮薄壁细胞组成。次生韧皮部中仅分布有少量韧皮纤维，韧皮射线不明显。许多内生菌丝侵入了根被。
结论
南方红豆杉根的次生结构与其他裸子植物和双子叶植物的次生结构相符，尽管其次生木质部由管胞和筛胞组成。南方红豆杉根的根被局部细胞中存在内生菌丝。
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